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Hey there everyone.

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Welcome to our virtual lecture today.

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Thank you for joining in and trying to

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capture some of the things I would have wanted to tell you in person,

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but due to COVID-related things,

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I cannot be there right now.

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Nevertheless,

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welcome

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to the class.

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Objective for today is to better understand the engineering drawing standard.

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This is going to be a part of the class from this time forward.

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It will show up again and again and again and you're gonna need to know

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how,

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what

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is required of you when making engineering drawings.

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That's what we're trying to describe today.

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But please,

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be

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aware that the things I'm describing to you right now are also on Learning Suite

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under the content section,

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and they are there for you to be able to

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see basically everything we're gonna talk about right now.

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But I'm just gonna talk through some of them

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to help you.

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Now,

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also,

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in section 5.7 of the guidebook where engineering part drawings are discussed,

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this page,

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the page you're seeing right here shows 28 standards.

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22 of them are industry standards and 6 of them are company standards

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and this concept is important to understand.

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Please go look at this

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and try to follow along with these standards and the pictures that follow them

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where each of these standards are sort of discussed,

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and

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pointed out.

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Though I'll tell you now,

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this part of the guidebook will be way more understandable if you

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stick with this video and watch it through to the end.

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Plus speed it up and watch it as fast as you can,

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OK?

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All right,

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the example used in this visual guide

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is the clamp shown here,

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which is a Bessey 6-inch clamp.

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We

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modeled this

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and chose it specifically because it could be used to demonstrate all of the

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engineering drawing standards,

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OK?

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Before we talk about the standards though,

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super valuable for you to know that, "Above all,

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drawings should be clear,

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complete,

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and unambiguous."

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Now it's valuable to create drawings that are also pleasing to look at

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and require the least amount of energy to be correctly understood,

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and that's what the standard is all about.

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OK?

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But to understand the standard,

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you're gonna need to know

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the following words.

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First of words you're gonna need to know are.

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You're gonna need to know

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what a Sheet Format is?

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That's

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basically the overall sheet size

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and its format,

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which is like these lines around the side,

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OK?

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And then the Title Block,

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which is this thing down in the bottom right-hand corner.

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All right,

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what else are you gonna need to know?

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You're gonna need to know that

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these things in this area are called isometric,

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excuse me,

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called orthographic views.

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These are orthographic projections.

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In this area right up here,

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these are our isometric views,

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OK?

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And then we have Auxiliary Views such as these,

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but there are many kinds of auxiliary views.

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This is called the Detail View.

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The Detail View is being pointed out right in this area

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with the A

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and then it is zoomed into that area right in here,

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and we can see what's going on.

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But

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there are also

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Section Views,

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Scales Views,

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Cutaway Views,

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all kinds of views can be done.

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These are all called Auxiliary Views.

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You need to know those

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words as well.

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All right,

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other thing that's going on here is that there is an Assembly Drawing,

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and there are Part Drawings.

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Assembly drawings,

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as shown on the left are a collection of a whole bunch of parts,

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and a really important part of the assembly drawing

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is the bill of materials or the parts list.

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It is sometimes called,

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and it's this thing that's right here.

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And each one of these parts in the Parts List

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refers to

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another

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CAD model.

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And it has

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its own drawing like what we see right over here.

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So,

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the Assembly Drawing is just the assembly

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of all the pieces,

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and then all the parts are separate

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drawings.

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OK,

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they're controlled differently and so on and so forth,

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they're separate drawings.

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OK,

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next piece.

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Alright,

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we just talked a second ago about the bill of materials or the parts list,

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which is a list of all the parts and the quantity

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of those parts in the assembly.

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And then

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in the Part Drawings and Assembly Drawings,

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we have notes.

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Those notes always appear directly above

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the title block.

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Another really important thing, in the title block is the title block tolerances.

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The title block tolerances specify

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how precise a part needs to be made,

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and in our title block that we use for the class,

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both inch and millimeter are specified in the same one,

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and

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this helps us to know the precision of the parts that need to be made.

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All right.

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Now,

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a few more things you need to know before we even get into the standards,

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some vocabulary,

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this

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is called a Dimension Line.

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The dimension line has an arrow on the end of it,

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and it always has a dimension in the middle of it.

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An Extension Line is the thing that the arrow is pointing to,

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and it always

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comes close to but does not touch the part.

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See,

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like right there's a little visual gap,

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OK.

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We also have things that are called Detail Markers.

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These are usually circles with a letter next to them,

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but they can also be squares and other things,

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but the default is a circle,

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and that's called a Detail Marker.

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In this case,

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it's Detail A Marker.

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OK,

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then we also have Part Line.

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The part line means that it is a line connected to the actual part,

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the geometry.

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Now,

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in this image,

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you can see that the Dimension Line,

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this one,

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and the Extension Line are somewhat gray.

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And so, you can sort of tell the difference between a

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Part Line and sort of an Annotation Line,

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but

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sometimes these both appear as black and sometimes have very similar line weights.

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And

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so,

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it's,

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if you follow the standards,

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you can tell what the differences are between them,

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but be aware that there is a Part Line and

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then there are Dimension Lines and there are Extension Lines.

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Now Leader Line is another kind of thing and it

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is sort of like a dimension and an extension

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line all put into one for arcs and circles,

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OK?

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We also have two more things going on here that we need to know,

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and that's the Hidden Line.

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The Hidden Line,

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of course,

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is the dashed line

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that appears on things,

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and then we have our center line.

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And our center line is

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or the center marker,

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right,

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this is probably better said as a center marker,

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but that points to the center of the circle in this case.

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All right.

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And then,

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here is the Center Line.

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This is probably what we should have said before.

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The other page was Center Marker.

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This one is a Center Line.

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The Center Line is a long,

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short,

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long,

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short,

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long,

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short dash line.

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And it represents the center of anything.

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In this case,

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it's the center between what we

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would guess,

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you know,

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these two lines are equally

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separated from that center line.

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All right,

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a few more things we gotta know in terms of understanding

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our vocabulary.

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OK.

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This is a section view.

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I know it's a section view because it has cross-hatched material.

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That means if we sort of slice the product

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right down this line,

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that's right here,

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whoa,

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that's horrible,

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and

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then look in the direction of A,

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A and A we will see

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section A-A,

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and this is section A-A.

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It's being specified right there.

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And anytime there's a cross-hatch,

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that means we're looking at solid material,

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and anytime there's no cross-hatch like in this hole,

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we know we're looking at air,

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OK,

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which is exactly what's happening when you're,

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you can look right down here at this,

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OK?

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There is a hole in the middle of that and so that's what we're seeing right there.

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All right,

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wow,

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I can't really see what's going on.

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Let me get rid of some of these,

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let's

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get rid of some of this.

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OK,

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what else do we have on here that we need to look at?

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OK.

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We

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have already said that, that up at the top is the section view.

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We have the section view title and scale.

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OK,

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the scale auto-populates in there.

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OK.

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And then what else do we have?

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We have the Section Line and the Section Marker.

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We've sort of already talked about those ones.

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OK,

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those were the

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vocabulary that you need to know

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as we start to get now into the

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drawing standard.

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I'm not going to read every word that's on these slides.

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These

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are in the style guide,

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which

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is

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online for you to see for

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the drawing standard under the graphical standards.

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But

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I will just step through them and try to make them clear for you.

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All right?

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So,

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first of all,

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all of the drawings you create in this class need to be made on B-sized drawing.

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That's 11 by 17.

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You'll never be asked to print,

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so it's OK.

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You're just going to turn in these digital ones at 11 by 17,

282
00:09:11,989 --> 00:09:12,429
OK?

283
00:09:13,219 --> 00:09:13,890
So please,

284
00:09:14,020 --> 00:09:16,820
do not do them on a smaller sheet.

285
00:09:17,099 --> 00:09:18,770
Do not do them in a portrait sheet.

286
00:09:18,979 --> 00:09:19,260
Yes,

287
00:09:19,619 --> 00:09:21,289
always do them in a

288
00:09:21,780 --> 00:09:23,669
B-sized landscape

289
00:09:24,219 --> 00:09:24,710
view.

290
00:09:25,260 --> 00:09:25,539
All right,

291
00:09:25,700 --> 00:09:31,299
all MeEn 272 drawings should use the provided MeEn 272 B-sized landscape sheet format.

292
00:09:31,919 --> 00:09:33,880
And maybe we just ask ourselves why.

293
00:09:34,409 --> 00:09:35,130
Actually,

294
00:09:35,609 --> 00:09:37,849
we have taken a traditional

295
00:09:39,359 --> 00:09:42,590
sheet format that you might find in industries such as this one,

296
00:09:42,880 --> 00:09:45,479
and we have simplified it down to just the

297
00:09:45,479 --> 00:09:47,549
core things that are important for this class.

298
00:09:48,070 --> 00:09:49,510
It's the one we get right down here,

299
00:09:49,719 --> 00:09:51,590
and it's actually easier for you

300
00:09:51,789 --> 00:09:54,299
to not have to go seek a whole bunch of approvals,

301
00:09:54,520 --> 00:09:56,630
but instead just have one person check your drawing,

302
00:09:56,640 --> 00:09:57,869
and it's just easier,

303
00:09:57,880 --> 00:09:58,559
easier,

304
00:09:58,599 --> 00:10:00,830
easier to use the formats that we have given you.

305
00:10:01,320 --> 00:10:03,950
Use the Getting Started Link in Learning Suite if

306
00:10:03,950 --> 00:10:05,679
you haven't figured out yet how to do this.

307
00:10:07,270 --> 00:10:07,539
All right,

308
00:10:07,659 --> 00:10:08,650
hidden lines

309
00:10:08,979 --> 00:10:12,530
should be shown in standard orthographic views of part drawings.

310
00:10:12,820 --> 00:10:14,130
Let's see what this looks like.

311
00:10:14,299 --> 00:10:14,859
OK?

312
00:10:15,340 --> 00:10:15,539
Yes,

313
00:10:15,700 --> 00:10:16,900
we should have hidden lines.

314
00:10:16,979 --> 00:10:21,369
You can see all the hidden lines in these standard orthographic views.

315
00:10:21,739 --> 00:10:25,179
These are really helpful for us to understand what's going on in the product,

316
00:10:25,219 --> 00:10:26,780
and they're expected to be there.

317
00:10:28,809 --> 00:10:29,130
All right,

318
00:10:29,330 --> 00:10:30,489
hidden lines

319
00:10:30,809 --> 00:10:31,690
should not be shown,

320
00:10:31,729 --> 00:10:32,210
however,

321
00:10:32,369 --> 00:10:33,450
if they're too busy.

322
00:10:34,200 --> 00:10:34,710
All right,

323
00:10:34,840 --> 00:10:39,950
and here we can see in this view down here all the hidden lines have been removed

324
00:10:40,479 --> 00:10:42,760
because it's already super busy and what does it

325
00:10:42,760 --> 00:10:44,549
look like when the hidden lines are there?

326
00:10:44,960 --> 00:10:45,989
It looks like this

327
00:10:46,320 --> 00:10:48,539
and it becomes virtually unusable.

328
00:10:48,679 --> 00:10:52,030
So, in some cases you may choose to turn off

329
00:10:52,679 --> 00:10:55,000
the Hidden Lines in a particular view if it is

330
00:10:55,000 --> 00:10:57,840
obscuring the view and making it too, too busy.

331
00:10:59,419 --> 00:10:59,580
All right,

332
00:10:59,700 --> 00:11:01,619
hidden lines should not be shown on isometric

333
00:11:01,619 --> 00:11:03,940
views nor on section views of part drawings.

334
00:11:04,849 --> 00:11:05,169
All right,

335
00:11:05,409 --> 00:11:06,210
so here we go.

336
00:11:06,330 --> 00:11:07,640
Here's our isometric view.

337
00:11:07,969 --> 00:11:09,859
We should not show hidden lines in this view.

338
00:11:09,969 --> 00:11:10,330
Instead,

339
00:11:10,450 --> 00:11:11,520
they should appear like this.

340
00:11:13,609 --> 00:11:13,969
Why?

341
00:11:14,130 --> 00:11:16,090
Because it's just too busy and too hard to

342
00:11:16,090 --> 00:11:18,500
understand where those hidden lines are actually at.

343
00:11:18,929 --> 00:11:20,840
Now in the cross-sectional views,

344
00:11:21,010 --> 00:11:23,919
we also do not look at hidden lines.

345
00:11:24,090 --> 00:11:26,119
So, this is what a cross-section view should look like.

346
00:11:26,210 --> 00:11:28,919
It should not look like this one that's up here.

347
00:11:29,330 --> 00:11:29,549
Why?

348
00:11:29,729 --> 00:11:32,789
Because the section view is trying to show the detail at the section.

349
00:11:32,849 --> 00:11:35,010
It doesn't want to show the detail everywhere else.

350
00:11:38,099 --> 00:11:39,900
Hidden lines should not be shown in assembly

351
00:11:39,900 --> 00:11:43,770
drawings, unless visual or technical clarity requires it.

352
00:11:44,140 --> 00:11:44,489
So,

353
00:11:44,659 --> 00:11:45,219
for example,

354
00:11:45,409 --> 00:11:47,059
this is a pretty good view

355
00:11:47,500 --> 00:11:48,580
of the

356
00:11:49,200 --> 00:11:50,820
Bessey 6-inch clamp.

357
00:11:51,549 --> 00:11:53,780
Here is a not-so-good view.

358
00:11:54,309 --> 00:11:58,580
It is produced just extra information that isn't super useful

359
00:11:59,309 --> 00:11:59,940
necessarily.

360
00:12:00,239 --> 00:12:03,739
Now I think one exception for this might be in this region

361
00:12:04,109 --> 00:12:05,960
where you want to sort of figure out

362
00:12:06,309 --> 00:12:10,659
how far does a metal shaft go into this wooden handle,

363
00:12:11,030 --> 00:12:11,849
but for the most part,

364
00:12:11,909 --> 00:12:15,179
we do not put hidden lines on assembly drawings.

365
00:12:16,400 --> 00:12:19,960
Views should be selected to minimize the number of hidden lines.

366
00:12:21,049 --> 00:12:21,590
OK.

367
00:12:22,830 --> 00:12:24,049
Let's just see how this works,

368
00:12:24,130 --> 00:12:24,409
OK?

369
00:12:24,530 --> 00:12:26,559
Here's the handle of the Bessey clamp.

370
00:12:26,969 --> 00:12:28,520
In this particular view,

371
00:12:28,690 --> 00:12:29,400
I have

372
00:12:29,690 --> 00:12:31,900
a front view and I have a top view,

373
00:12:32,210 --> 00:12:33,719
and then over here is a section view,

374
00:12:33,849 --> 00:12:34,609
obviously,

375
00:12:35,190 --> 00:12:35,479
and

376
00:12:35,520 --> 00:12:37,599
by its orientation

377
00:12:37,770 --> 00:12:38,900
up in this area,

378
00:12:38,909 --> 00:12:41,489
there are all kinds of hidden lines.

379
00:12:42,330 --> 00:12:45,419
But if I flip the whole thing around

380
00:12:45,909 --> 00:12:47,859
and have my front view here,

381
00:12:48,700 --> 00:12:50,340
and this is my top view,

382
00:12:50,739 --> 00:12:50,940
now,

383
00:12:50,979 --> 00:12:52,619
I have no hidden lines.

384
00:12:52,820 --> 00:12:52,929
So,

385
00:12:52,940 --> 00:12:56,289
we always want to choose the orientation of

386
00:12:56,859 --> 00:12:57,450
views,

387
00:12:57,619 --> 00:12:58,330
such that

388
00:12:58,500 --> 00:13:00,940
the number of hidden lines is minimized.

389
00:13:02,239 --> 00:13:02,400
All right,

390
00:13:02,450 --> 00:13:05,679
the most descriptive view of the product should be chosen as the front view.

391
00:13:07,960 --> 00:13:09,109
Why is this important?

392
00:13:09,260 --> 00:13:09,789
Well,

393
00:13:10,359 --> 00:13:10,760
first of all,

394
00:13:10,840 --> 00:13:11,640
it's just natural.

395
00:13:11,799 --> 00:13:14,510
So, this is all really good right up here.

396
00:13:14,919 --> 00:13:18,809
This is what I deem to be the most descriptive view of the product,

397
00:13:19,280 --> 00:13:20,710
not this.

398
00:13:21,440 --> 00:13:21,559
OK,

399
00:13:21,640 --> 00:13:23,599
this is not the most descriptive view of the product.

400
00:13:23,679 --> 00:13:23,789
So,

401
00:13:23,799 --> 00:13:25,030
we do not want

402
00:13:25,520 --> 00:13:26,080
to choose this.

403
00:13:26,119 --> 00:13:28,390
We want to choose the most descriptive view,

404
00:13:28,679 --> 00:13:29,549
like this one

405
00:13:30,000 --> 00:13:31,000
to be the front view.

406
00:13:31,200 --> 00:13:32,200
That is the standard.

407
00:13:33,429 --> 00:13:33,700
All right.

408
00:13:33,900 --> 00:13:37,890
Isometric views of parts should be placed in the upper right area of the drawing.

409
00:13:39,229 --> 00:13:42,419
Now this is a good time for me just to pause and say that in the

410
00:13:42,840 --> 00:13:46,099
section of the guidebook there are two kinds of standards that are described.

411
00:13:46,109 --> 00:13:47,549
One is the industry-wide standard.

412
00:13:47,630 --> 00:13:49,200
One is the company-wide standard.

413
00:13:49,630 --> 00:13:52,099
This one is not an industry-wide standard,

414
00:13:52,429 --> 00:13:55,099
but it is the standard I want you to use in this class,

415
00:13:55,349 --> 00:13:58,989
which is that the isometric view goes up into the top right view.

416
00:14:00,840 --> 00:14:02,070
Not down here.

417
00:14:02,840 --> 00:14:02,849
Not

418
00:14:03,330 --> 00:14:05,239
off to the side over here,

419
00:14:05,510 --> 00:14:06,400
not anywhere else,

420
00:14:06,510 --> 00:14:08,770
want to have it right up in this area.

421
00:14:09,109 --> 00:14:13,070
I'm liking it right up in that area because in the olden days when these kinds

422
00:14:13,070 --> 00:14:16,099
of things used to be printed and there still are some people who print these,

423
00:14:16,859 --> 00:14:19,340
this would be bound along this side,

424
00:14:19,909 --> 00:14:21,900
and you would want to thumb through

425
00:14:22,309 --> 00:14:25,429
the sheets without opening up each sheet to get a very

426
00:14:25,429 --> 00:14:28,400
quick view of what it is. And having it in this area

427
00:14:28,830 --> 00:14:30,989
with the title block also on the right side

428
00:14:31,469 --> 00:14:35,270
helps to know what the drawing is all about with having to open up the entire sheet.

429
00:14:37,390 --> 00:14:40,229
Views should not be shaded or rendered on any drawing.

430
00:14:41,390 --> 00:14:41,590
OK,

431
00:14:41,679 --> 00:14:44,150
this is also a company standard actually,

432
00:14:44,630 --> 00:14:44,900
but

433
00:14:44,909 --> 00:14:48,820
it is derived from the notion that

434
00:14:49,349 --> 00:14:49,729
in

435
00:14:49,750 --> 00:14:53,460
the olden days when drawings like this would be photocopied,

436
00:14:55,000 --> 00:14:56,590
information 

437
00:14:55,590 --> 00:14:57,140
would become obscured

438
00:14:57,520 --> 00:14:59,239
in these dark areas.

439
00:14:59,390 --> 00:15:00,570
So, it's better,

440
00:15:00,760 --> 00:15:02,820
just much better to not do that

441
00:15:03,109 --> 00:15:04,099
and just have

442
00:15:04,390 --> 00:15:05,590
no shaded views in there.

443
00:15:05,659 --> 00:15:07,340
So, this is how we want it to be.

444
00:15:07,590 --> 00:15:08,619
We don't want this,

445
00:15:09,190 --> 00:15:10,099
we do want this.

446
00:15:11,169 --> 00:15:11,419
All right,

447
00:15:11,539 --> 00:15:14,080
each part must be fully dimensioned and no redundant

448
00:15:14,080 --> 00:15:17,869
dimensions should be present in an engineering drawing.

449
00:15:18,200 --> 00:15:18,440
So,

450
00:15:18,479 --> 00:15:19,830
take a look at this one for a second,

451
00:15:19,919 --> 00:15:21,590
see if you can see why

452
00:15:21,960 --> 00:15:24,710
one of these is good and why one of these is not 

453
00:15:24,710 --> 00:15:24,820
good.

454
00:15:36,250 --> 00:15:36,739
OK,

455
00:15:36,840 --> 00:15:38,270
even I'm having a hard time with this one.

456
00:15:38,349 --> 00:15:38,640
Let's see.

457
00:15:38,710 --> 00:15:38,869
OK,

458
00:15:38,950 --> 00:15:40,510
so that's the same on both drawings.

459
00:15:40,669 --> 00:15:41,109
Oh yes,

460
00:15:41,190 --> 00:15:41,390
OK,

461
00:15:41,429 --> 00:15:42,539
we are missing

462
00:15:42,710 --> 00:15:43,500
this one

463
00:15:43,909 --> 00:15:45,340
is one that we want,

464
00:15:45,669 --> 00:15:47,460
and it's not present over here,

465
00:15:47,549 --> 00:15:49,830
so I don't know how to make this with

466
00:15:51,969 --> 00:15:52,149
unless 

467
00:15:52,149 --> 00:15:53,890
I have it specified on the drawing.

468
00:15:54,010 --> 00:15:54,140
So,

469
00:15:54,169 --> 00:15:56,119
I need to have all my information there,

470
00:15:56,450 --> 00:15:59,219
and then I do not want to have redundant information.

471
00:15:59,330 --> 00:15:59,520
So,

472
00:15:59,570 --> 00:16:01,450
this is redundant information,

473
00:16:01,809 --> 00:16:03,450
as you can see in this area right here.

474
00:16:03,489 --> 00:16:05,140
It's redundant because

475
00:16:06,849 --> 00:16:11,239
1.05 plus 0.6 is equal to 1.65.

476
00:16:11,409 --> 00:16:14,630
So, this dimension is redundant and should not be there,

477
00:16:14,690 --> 00:16:15,260
or frankly,

478
00:16:15,369 --> 00:16:16,320
any one of these.

479
00:16:16,570 --> 00:16:17,570
This one could be redundant,

480
00:16:17,609 --> 00:16:17,849
this one,

481
00:16:17,929 --> 00:16:19,109
all three of these are redundant,

482
00:16:19,239 --> 00:16:20,400
maybe is the way to say it.

483
00:16:22,380 --> 00:16:24,869
For two dimensions that apply to the same dimension,

484
00:16:25,099 --> 00:16:29,090
one should be indicated as a reference dimension with the parentheses or

485
00:16:29,780 --> 00:16:31,429
with the notation "REF."

486
00:16:32,840 --> 00:16:33,119
OK,

487
00:16:33,280 --> 00:16:33,729
so

488
00:16:34,049 --> 00:16:34,549
for example,

489
00:16:34,679 --> 00:16:35,400
let's see if we can find this,

490
00:16:35,479 --> 00:16:35,880
OK?

491
00:16:36,000 --> 00:16:36,630
We

492
00:16:36,760 --> 00:16:37,229
can,

493
00:16:37,239 --> 00:16:39,309
whenever there's a parenthesis like this one,

494
00:16:39,640 --> 00:16:41,229
it means it's a reference dimension.

495
00:16:41,400 --> 00:16:43,950
It means there is a redundancy associated with this,

496
00:16:43,960 --> 00:16:45,190
but it may be useful

497
00:16:45,479 --> 00:16:46,880
for someone to know this dimension,

498
00:16:46,960 --> 00:16:48,510
so they don't have to calculate it out

499
00:16:48,919 --> 00:16:49,510
or

500
00:16:49,919 --> 00:16:51,609
the word "REF" is typed in there.

501
00:16:54,429 --> 00:16:56,710
Dimension lines should be placed so they are easily understood

502
00:16:56,710 --> 00:16:59,150
and do not interfere with the part or assembly lines.

503
00:17:00,590 --> 00:17:00,830
So,

504
00:17:00,909 --> 00:17:01,750
let's see how we did here.

505
00:17:01,830 --> 00:17:03,109
This one's looking pretty good.

506
00:17:03,270 --> 00:17:05,030
This is the Cap that goes on the end of the

507
00:17:05,189 --> 00:17:05,510
clamp,

508
00:17:05,550 --> 00:17:09,098
so you don't mar up the wood or whatever soft material you're touching.

509
00:17:09,430 --> 00:17:10,329
All of these

510
00:17:10,630 --> 00:17:11,430
extension lines,

511
00:17:11,469 --> 00:17:12,469
we're talking about extension lines.

512
00:17:12,510 --> 00:17:13,410
I'm gonna go

513
00:17:13,790 --> 00:17:15,300
extension lines for a second,

514
00:17:15,310 --> 00:17:15,520
yeah.

515
00:17:15,630 --> 00:17:15,858
So,

516
00:17:17,810 --> 00:17:18,000
yes,

517
00:17:18,040 --> 00:17:18,190
that's

518
00:17:18,190 --> 00:17:18,400
good.

519
00:17:18,439 --> 00:17:19,750
Let's look at the bad version of this,

520
00:17:19,800 --> 00:17:20,358
OK?

521
00:17:20,760 --> 00:17:20,979
Here,

522
00:17:21,118 --> 00:17:24,810
the Leader Line is not clearly pointing to one feature for this,

523
00:17:25,160 --> 00:17:26,310
so that's really bad.

524
00:17:26,598 --> 00:17:27,750
And then over here

525
00:17:28,079 --> 00:17:29,989
we have the Dimension Line,

526
00:17:30,079 --> 00:17:33,270
which is the one with the arrow on it interfering with the Part Lines.

527
00:17:33,560 --> 00:17:34,319
That's not good.

528
00:17:34,439 --> 00:17:35,640
We don't like that.

529
00:17:35,800 --> 00:17:36,760
We don't like that at all.

530
00:17:38,140 --> 00:17:38,449
OK,

531
00:17:38,810 --> 00:17:42,010
dimensions should not be placed on isometric views.

532
00:17:42,170 --> 00:17:45,199
They should not be placed on isometric views because

533
00:17:46,010 --> 00:17:48,280
we know that if we draw a circle

534
00:17:49,130 --> 00:17:50,680
in an isometric view,

535
00:17:50,770 --> 00:17:52,560
it's shown as an ellipse

536
00:17:52,849 --> 00:17:54,000
in the isometric view.

537
00:17:54,050 --> 00:17:54,880
And so,

538
00:17:55,410 --> 00:17:57,989
if we try to dimension things in

539
00:17:58,689 --> 00:17:59,530
an isometric view,

540
00:17:59,609 --> 00:18:00,349
we are not

541
00:18:00,530 --> 00:18:02,239
measuring their true size,

542
00:18:02,489 --> 00:18:03,969
it's some other thing.

543
00:18:04,390 --> 00:18:05,430
And in solid works,

544
00:18:05,469 --> 00:18:06,380
if you try to do it,

545
00:18:06,430 --> 00:18:07,199
it will tell you,

546
00:18:07,280 --> 00:18:09,829
it will automatically put this word "TRUE" in front of it,

547
00:18:10,189 --> 00:18:11,510
but I don't want you to ever do that.

548
00:18:11,589 --> 00:18:11,989
It's

549
00:18:12,109 --> 00:18:13,270
not good,

550
00:18:13,310 --> 00:18:15,180
it's not part of the industry standard

551
00:18:15,979 --> 00:18:16,949
to dimension

552
00:18:17,300 --> 00:18:18,020
isometric views,

553
00:18:18,099 --> 00:18:20,260
we never want to dimension isometric views.

554
00:18:21,589 --> 00:18:22,109
All right,

555
00:18:22,300 --> 00:18:24,540
dimensions should be placed as close to the part.

556
00:18:24,949 --> 00:18:26,270
For successive dimensions,

557
00:18:26,290 --> 00:18:27,650
they should be close to each other.

558
00:18:27,989 --> 00:18:29,619
So, here's an example of this.

559
00:18:30,060 --> 00:18:30,109
We

560
00:18:30,150 --> 00:18:31,489
do not like this,

561
00:18:31,560 --> 00:18:31,790
OK?

562
00:18:31,910 --> 00:18:33,750
This is like, these parts,

563
00:18:33,869 --> 00:18:37,300
these dimensions are so far away from the part it's uncomfortable,

564
00:18:37,510 --> 00:18:39,160
just super uncomfortable to look at.

565
00:18:39,439 --> 00:18:39,849
Instead,

566
00:18:39,880 --> 00:18:42,189
we want to place them neat and tidy

567
00:18:42,589 --> 00:18:44,060
and near each other

568
00:18:44,670 --> 00:18:45,310
like this.

569
00:18:46,449 --> 00:18:46,670
OK,

570
00:18:46,709 --> 00:18:49,020
this is also a good time for me to just remind you that

571
00:18:49,229 --> 00:18:50,709
I did not make up these standards.

572
00:18:50,829 --> 00:18:53,579
These standards are ones that have been used for decades,

573
00:18:53,949 --> 00:18:55,339
but they are good,

574
00:18:55,670 --> 00:18:55,829
right?

575
00:18:55,949 --> 00:18:59,699
They do help to make it so that every time you see an engineering drawing

576
00:19:00,099 --> 00:19:01,229
in the future,

577
00:19:01,270 --> 00:19:05,219
it will not feel as foreign as it does to you right now when you're learning.

578
00:19:05,430 --> 00:19:05,829
Instead,

579
00:19:05,869 --> 00:19:08,709
you start to see the common things again and again and again and

580
00:19:08,709 --> 00:19:11,910
it will start to feel natural and be easier to read over time.

581
00:19:12,290 --> 00:19:12,540
All right,

582
00:19:12,599 --> 00:19:13,640
on to this next one then,

583
00:19:13,739 --> 00:19:18,589
which is that dimensions should generally be placed between orthogonal views.

584
00:19:18,800 --> 00:19:21,030
So, just take a look at what's going on here.

585
00:19:21,400 --> 00:19:25,229
All of these dimensions are placed in between this view

586
00:19:25,560 --> 00:19:26,250
and this view.

587
00:19:26,439 --> 00:19:30,109
So, we call these two views orthogonal because they're 90-degree projections

588
00:19:30,400 --> 00:19:31,270
of each other,

589
00:19:31,680 --> 00:19:33,930
and the dimension is placed between them

590
00:19:34,239 --> 00:19:36,400
as opposed to what's going on over here

591
00:19:36,400 --> 00:19:38,599
where the dimensions are not placed between them.

592
00:19:39,050 --> 00:19:41,819
The reason why this is valuable is that

593
00:19:42,020 --> 00:19:44,170
if you just take a look at what's going on right here

594
00:19:44,719 --> 00:19:45,670
in this area,

595
00:19:45,680 --> 00:19:47,170
there are two hidden lines,

596
00:19:47,339 --> 00:19:48,020
right?

597
00:19:48,219 --> 00:19:50,350
If I want to know which 

598
00:19:50,350 --> 00:19:50,660
dimension

599
00:19:51,380 --> 00:19:51,630
this,

600
00:19:51,780 --> 00:19:51,939
you know,

601
00:19:52,060 --> 00:19:54,449
which hidden line this dimension is applied to,

602
00:19:54,780 --> 00:19:59,410
it's a little bit easier for me to do when that dimension has extension lines that are

603
00:19:59,739 --> 00:20:01,619
going near this other view.

604
00:20:02,530 --> 00:20:02,959
OK,

605
00:20:03,109 --> 00:20:03,910
so can

606
00:20:03,989 --> 00:20:04,939
I figure that out?

607
00:20:05,030 --> 00:20:05,430
I don't know.

608
00:20:05,670 --> 00:20:05,790
See,

609
00:20:06,109 --> 00:20:08,020
this is the bottom of the cutout,

610
00:20:08,390 --> 00:20:10,459
and this is the top of the fillet.

611
00:20:10,869 --> 00:20:11,150
OK,

612
00:20:11,270 --> 00:20:11,660
so this,

613
00:20:11,709 --> 00:20:12,949
if I could draw a straight line,

614
00:20:13,030 --> 00:20:14,060
which I don't know if I can,

615
00:20:14,160 --> 00:20:14,530
but

616
00:20:14,829 --> 00:20:16,660
basically that's what's going on there.

617
00:20:16,869 --> 00:20:19,229
That's easier to tell than when I'm over here,

618
00:20:20,489 --> 00:20:20,959
you know,

619
00:20:21,869 --> 00:20:24,449
I get to the same line because I already know what it is now,

620
00:20:24,680 --> 00:20:25,089
but

621
00:20:25,300 --> 00:20:27,489
we want to sort of put those dimensions in between them,

622
00:20:27,660 --> 00:20:31,810
it allows for the dimensions to be more shareable across the orthogonal

623
00:20:32,180 --> 00:20:32,699
views.

624
00:20:34,400 --> 00:20:37,310
Dimension lines should not cross,

625
00:20:38,660 --> 00:20:41,800
and should not cross part lines or extension lines,

626
00:20:41,880 --> 00:20:42,430
OK?

627
00:20:42,640 --> 00:20:42,760
Yeah,

628
00:20:42,920 --> 00:20:45,579
we don't want to have a bunch of lines crossing each other.

629
00:20:45,750 --> 00:20:47,199
So, let's go look at what's going on here,

630
00:20:47,239 --> 00:20:47,680
OK?

631
00:20:47,880 --> 00:20:50,160
This one over here is obviously looking good.

632
00:20:50,359 --> 00:20:50,670
OK.

633
00:20:50,800 --> 00:20:51,030
I

634
00:20:51,199 --> 00:20:55,030
have extension lines that are crossing each other and we'll see

635
00:20:55,359 --> 00:20:55,969
maybe in a second,

636
00:20:56,000 --> 00:20:57,599
I think there's a standard that says that that's OK,

637
00:20:57,680 --> 00:20:59,109
at least I know that it's OK,

638
00:20:59,359 --> 00:21:02,310
but we do not have dimension lines crossing each other.

639
00:21:02,520 --> 00:21:03,199
Dimension lines,

640
00:21:03,280 --> 00:21:05,800
the ones with arrows should never ever cross each other.

641
00:21:06,420 --> 00:21:11,050
Nor should the ones with arrows be located on top of the part.

642
00:21:11,380 --> 00:21:13,130
Here's located on top of the part.

643
00:21:13,380 --> 00:21:14,170
Instead,

644
00:21:14,579 --> 00:21:16,500
they need to be moved off of the part.

645
00:21:17,819 --> 00:21:20,239
We also should not have dimension lines,

646
00:21:20,260 --> 00:21:23,859
so this Leader Line is a Dimension Line for an arc,

647
00:21:24,300 --> 00:21:26,050
and it is crossing

648
00:21:26,660 --> 00:21:27,250
these,

649
00:21:28,339 --> 00:21:28,450
these

650
00:21:28,450 --> 00:21:29,369
extension lines,

651
00:21:29,380 --> 00:21:30,770
and they should not be doing that.

652
00:21:31,060 --> 00:21:32,530
How could all this be arranged?

653
00:21:32,790 --> 00:21:36,050
Sometimes it's a little puzzle and you just got to do it until it works out,

654
00:21:36,099 --> 00:21:40,369
and this one right over here is the one where we get that working out just right.

655
00:21:40,739 --> 00:21:40,890
All right,

656
00:21:40,939 --> 00:21:42,780
extension lines may cross,

657
00:21:43,170 --> 00:21:44,810
but should not coincide with part lines.

658
00:21:44,890 --> 00:21:46,089
This is what I was saying a minute ago,

659
00:21:46,130 --> 00:21:48,569
is that the extension lines may cross each other.

660
00:21:49,290 --> 00:21:49,489
Yeah,

661
00:21:49,569 --> 00:21:50,640
let's see if we can find,

662
00:21:50,729 --> 00:21:51,239
I

663
00:21:51,290 --> 00:21:52,319
guess there's not 

664
00:21:53,189 --> 00:21:54,709
an awesome example of this.

665
00:21:55,069 --> 00:21:55,150
We

666
00:21:55,150 --> 00:21:56,660
saw that on the last one though,

667
00:21:57,479 --> 00:21:59,180
but what we are seeing on this one

668
00:21:59,630 --> 00:22:03,540
is that the extension line should not coincide with

669
00:22:03,910 --> 00:22:04,540
the

670
00:22:04,910 --> 00:22:05,630
part line.

671
00:22:05,949 --> 00:22:06,199
So,

672
00:22:06,229 --> 00:22:07,140
for example,

673
00:22:07,660 --> 00:22:09,859
this line that's right in here,

674
00:22:10,050 --> 00:22:10,670
that one,

675
00:22:10,829 --> 00:22:11,390
OK,

676
00:22:11,790 --> 00:22:14,420
and this one are colinear,

677
00:22:14,750 --> 00:22:17,280
but they don't occupy the same space.

678
00:22:17,989 --> 00:22:18,380
OK,

679
00:22:18,459 --> 00:22:20,250
in this one down here,

680
00:22:20,579 --> 00:22:22,369
they're occupying the same space.

681
00:22:22,449 --> 00:22:24,290
They're literally on top of each other.

682
00:22:24,699 --> 00:22:25,930
We do not want that to happen,

683
00:22:25,979 --> 00:22:28,530
we want to have the extension line come off of the part,

684
00:22:28,819 --> 00:22:29,890
not be on the part.

685
00:22:30,060 --> 00:22:33,010
So, here we can see the Leader Line is on top of the Part Line.

686
00:22:33,060 --> 00:22:33,810
We don't like that.

687
00:22:33,880 --> 00:22:34,609
That's not

688
00:22:34,859 --> 00:22:34,930
good.

689
00:22:34,939 --> 00:22:35,890
It's not just we don't like it,

690
00:22:35,900 --> 00:22:37,900
it's inconsistent with the standards.

691
00:22:38,930 --> 00:22:40,839
Dimensions should be made to visible lines,

692
00:22:40,969 --> 00:22:41,930
not hidden lines.

693
00:22:43,420 --> 00:22:43,859
OK.

694
00:22:47,000 --> 00:22:49,050
Here we are dimensioning what is going on here?

695
00:22:49,160 --> 00:22:49,400
OK,

696
00:22:49,520 --> 00:22:50,469
in this area,

697
00:22:51,500 --> 00:22:54,410
we are dimensioning to actual lines that are not hidden

698
00:22:55,020 --> 00:22:57,530
in these other areas that are orange,

699
00:22:57,859 --> 00:22:58,459
we

700
00:22:58,500 --> 00:23:00,130
are dimensioning to hidden lines,

701
00:23:00,140 --> 00:23:00,890
which is

702
00:23:00,979 --> 00:23:02,130
not appropriate.

703
00:23:02,500 --> 00:23:03,290
It's wrong,

704
00:23:03,579 --> 00:23:04,020
OK?

705
00:23:04,449 --> 00:23:05,010
Now,

706
00:23:05,260 --> 00:23:06,130
this one,

707
00:23:06,500 --> 00:23:09,920
we are coming right down and measuring on,

708
00:23:10,020 --> 00:23:10,969
we're measuring

709
00:23:11,300 --> 00:23:11,969
to

710
00:23:11,979 --> 00:23:13,530
the actual part lines,

711
00:23:13,900 --> 00:23:14,920
but frankly,

712
00:23:15,020 --> 00:23:17,030
these arrows should not be

713
00:23:17,380 --> 00:23:18,300
on top of the part,

714
00:23:18,339 --> 00:23:20,569
they need to be pulled off somewhere else.

715
00:23:21,380 --> 00:23:21,780
It is,

716
00:23:21,800 --> 00:23:22,280
however,

717
00:23:22,310 --> 00:23:24,510
hard to know where we would pull them off to,

718
00:23:25,069 --> 00:23:26,420
because if we pull them off,

719
00:23:26,750 --> 00:23:31,459
we're gonna end up with line just underneath this one and just underneath this one,

720
00:23:31,829 --> 00:23:34,420
and it's going to start to become less clear

721
00:23:34,869 --> 00:23:36,979
what that dimension is pointing to.

722
00:23:37,430 --> 00:23:39,579
If we have the dimension come off to here

723
00:23:39,790 --> 00:23:40,579
like this,

724
00:23:42,260 --> 00:23:44,739
this might be in a more appropriate place to have it,

725
00:23:44,859 --> 00:23:45,369
but

726
00:23:45,660 --> 00:23:47,739
we would not want to do it at the same time we're trying

727
00:23:47,739 --> 00:23:50,540
to do these because that's gonna get too complicated in that space.

728
00:23:50,619 --> 00:23:52,969
So, this is where we remember our original

729
00:23:53,270 --> 00:23:57,209
goal which is that above all engineering drawings should be clear

730
00:23:57,540 --> 00:23:59,449
and concise and correct.

731
00:23:59,859 --> 00:24:01,369
And in this case,

732
00:24:01,739 --> 00:24:03,250
this may be one reason

733
00:24:04,060 --> 00:24:04,609
to

734
00:24:04,869 --> 00:24:05,780
go with this

735
00:24:06,060 --> 00:24:08,180
even though it's technically a violation.

736
00:24:09,839 --> 00:24:10,040
Dimensions

737
00:24:10,040 --> 00:24:13,109
should be placed in views where the feature has its true shape,

738
00:24:13,400 --> 00:24:15,030
and is most clearly shown.

739
00:24:15,319 --> 00:24:15,630
So,

740
00:24:15,640 --> 00:24:16,500
for example,

741
00:24:16,839 --> 00:24:21,510
here on the diameter of this outside circle that's right over here,

742
00:24:21,839 --> 00:24:24,229
we want to dimension it where it appears as a circle.

743
00:24:24,439 --> 00:24:27,770
We do not want to dimension it where it does not appear as a circle.

744
00:24:30,010 --> 00:24:31,589
That's to help make it extra clear.

745
00:24:32,650 --> 00:24:35,089
Angular dimensions should point to extension lines,

746
00:24:35,150 --> 00:24:36,449
not to feature lines.

747
00:24:37,949 --> 00:24:38,599
OK.

748
00:24:38,910 --> 00:24:39,390
In other words,

749
00:24:39,469 --> 00:24:40,540
it should look like this.

750
00:24:41,510 --> 00:24:41,770
OK,

751
00:24:41,849 --> 00:24:42,770
right up here at the top.

752
00:24:43,849 --> 00:24:46,020
I've got an extension line off this face,

753
00:24:46,189 --> 00:24:48,060
an extension line off of here,

754
00:24:48,310 --> 00:24:49,989
and I've got a dimension in between it.

755
00:24:51,219 --> 00:24:52,030
Over here,

756
00:24:52,180 --> 00:24:54,229
I am pointing to part lines,

757
00:24:54,660 --> 00:24:56,699
not to extension lines or in this case the

758
00:24:56,699 --> 00:24:59,449
extension lines are coinciding with the part lines,

759
00:24:59,780 --> 00:25:00,410
which 

760
00:25:00,579 --> 00:25:01,609
is not good.

761
00:25:03,030 --> 00:25:06,540
Sometimes, it can be hard to know how to do this if not doing it this way,

762
00:25:06,869 --> 00:25:07,709
but nevertheless,

763
00:25:07,750 --> 00:25:10,040
this is a violation of the standard.

764
00:25:11,079 --> 00:25:11,190
Holes 

765
00:25:11,190 --> 00:25:13,979
should be dimensioned in views where they appear as circles.

766
00:25:14,310 --> 00:25:16,229
They should use the diameter symbol before the

767
00:25:16,229 --> 00:25:19,540
dimension or the notation "DIA" after the dimension,

768
00:25:20,109 --> 00:25:23,699
and the location dimension should come from the centerline of the circle.

769
00:25:24,829 --> 00:25:24,839
OK,

770
00:25:25,979 --> 00:25:26,380
so

771
00:25:26,619 --> 00:25:27,619
this is appropriate.

772
00:25:28,729 --> 00:25:29,869
This is appropriate.

773
00:25:32,930 --> 00:25:33,180
OK,

774
00:25:33,239 --> 00:25:34,699
these ones here are also appropriate,

775
00:25:34,760 --> 00:25:36,069
even though I'm on my

776
00:25:36,400 --> 00:25:37,339
no-thing,

777
00:25:37,640 --> 00:25:38,040
OK.

778
00:25:40,569 --> 00:25:40,675
But

779
00:25:40,675 --> 00:25:42,040
what's not good here,

780
00:25:42,290 --> 00:25:42,939
OK?

781
00:25:43,119 --> 00:25:43,719
So, first of all,

782
00:25:43,810 --> 00:25:46,560
we are dimensioning to the center of the circle,

783
00:25:47,290 --> 00:25:48,239
which is good.

784
00:25:50,380 --> 00:25:53,310
Here we are attempting to measure to the side of the circle,

785
00:25:53,660 --> 00:25:54,670
not good.

786
00:25:56,130 --> 00:25:57,239
Why do we do 

787
00:25:57,699 --> 00:25:57,760
that?

788
00:25:57,930 --> 00:26:02,010
Largely because holes are put in with drills and the center of the drill is known,

789
00:26:02,130 --> 00:26:03,680
really not the edge of the drill.

790
00:26:03,849 --> 00:26:05,040
So, we want to go place

791
00:26:05,290 --> 00:26:06,839
it based on the center.

792
00:26:07,530 --> 00:26:07,689
All 

793
00:26:07,570 --> 00:26:07,689
right,

794
00:26:08,410 --> 00:26:08,525
that's 

795
00:26:08,525 --> 00:26:09,239
that.

796
00:26:09,530 --> 00:26:09,729
OK,

797
00:26:09,810 --> 00:26:11,880
when there are multiple identical features,

798
00:26:12,250 --> 00:26:13,849
dimension only one feature

799
00:26:13,910 --> 00:26:17,290
and indicate the number of features to which the dimension applies by,

800
00:26:17,489 --> 00:26:18,239
for example,

801
00:26:18,410 --> 00:26:20,089
"6X" preceding the dimension.

802
00:26:20,770 --> 00:26:21,000
OK,

803
00:26:21,030 --> 00:26:22,770
let's go see what we got here.

804
00:26:23,089 --> 00:26:23,800
OK.

805
00:26:24,839 --> 00:26:24,959
Well,

806
00:26:25,119 --> 00:26:25,560
first of all,

807
00:26:25,719 --> 00:26:25,839
look,

808
00:26:25,920 --> 00:26:26,680
I got this one,

809
00:26:26,719 --> 00:26:27,589
which is good.

810
00:26:27,770 --> 00:26:28,000
OK,

811
00:26:28,079 --> 00:26:29,790
that refers to this,

812
00:26:30,599 --> 00:26:31,420
this,

813
00:26:31,949 --> 00:26:32,619
this,

814
00:26:33,339 --> 00:26:34,329
and this.

815
00:26:35,000 --> 00:26:35,829
But

816
00:26:36,119 --> 00:26:37,790
there's some things here that are not good,

817
00:26:37,920 --> 00:26:38,530
OK?

818
00:26:39,000 --> 00:26:40,469
That's this one,

819
00:26:41,680 --> 00:26:42,469
this one,

820
00:26:43,260 --> 00:26:43,939
this one,

821
00:26:44,079 --> 00:26:45,880
and look at this super messy one

822
00:26:46,239 --> 00:26:47,589
right down in here,

823
00:26:47,920 --> 00:26:48,060
right?

824
00:26:48,119 --> 00:26:49,199
We do not want to do that.

825
00:26:49,280 --> 00:26:50,989
Let's just simplify the thing

826
00:26:51,479 --> 00:26:52,160
and

827
00:26:52,680 --> 00:26:54,229
just go get ourselves

828
00:26:54,739 --> 00:26:55,939
4X

829
00:26:57,520 --> 00:26:58,609
R.1,

830
00:26:59,199 --> 00:26:59,640
OK?

831
00:26:59,920 --> 00:27:00,630
That's a lot better,

832
00:27:00,839 --> 00:27:02,719
a lot better than what we had otherwise.

833
00:27:04,920 --> 00:27:05,170
Rounds 

834
00:27:05,170 --> 00:27:07,550
and fillets should be dimensioned by radius,

835
00:27:07,760 --> 00:27:09,339
not by length or

836
00:27:10,000 --> 00:27:10,869
diameter.

837
00:27:11,239 --> 00:27:11,469
So,

838
00:27:11,479 --> 00:27:12,310
for example,

839
00:27:13,040 --> 00:27:13,570
these

840
00:27:13,570 --> 00:27:14,199
radii

841
00:27:15,000 --> 00:27:18,609
are all shown as R.13, that means it's a radius.

842
00:27:18,959 --> 00:27:19,510
We do 

843
00:27:19,719 --> 00:27:21,030
not do this.

844
00:27:21,819 --> 00:27:26,930
We only dimension with diameter symbol when it is a full circle.

845
00:27:27,260 --> 00:27:29,290
When is an arc or something else,

846
00:27:29,939 --> 00:27:30,069
it

847
00:27:29,069 --> 00:27:31,650
is dimensioned with a radius.

848
00:27:31,859 --> 00:27:32,989
This is the standard.

849
00:27:34,260 --> 00:27:34,760
OK.

850
00:27:35,000 --> 00:27:36,040
What are we looking at now?

851
00:27:36,119 --> 00:27:36,239
Oh,

852
00:27:36,280 --> 00:27:37,150
this is the same thing,

853
00:27:37,359 --> 00:27:37,479
right?

854
00:27:37,560 --> 00:27:39,410
We do not try to dimension

855
00:27:39,680 --> 00:27:40,729
radii

856
00:27:41,160 --> 00:27:41,839
with

857
00:27:42,780 --> 00:27:44,339
linear dimensions.

858
00:27:45,329 --> 00:27:46,829
We use an arc command,

859
00:27:46,869 --> 00:27:47,030
you know,

860
00:27:47,109 --> 00:27:48,060
like a radius command.

861
00:27:48,229 --> 00:27:48,349
All right,

862
00:27:48,430 --> 00:27:49,189
in dimensions,

863
00:27:49,390 --> 00:27:49,699
excuse me,

864
00:27:49,880 --> 00:27:50,670
chamfers may

865
00:27:50,869 --> 00:27:54,359
be dimensioned by horizontal and vertical distances,

866
00:27:55,150 --> 00:27:55,210
or

867
00:27:55,210 --> 00:27:57,640
by horizontal dimension and an angle.

868
00:27:58,719 --> 00:27:58,989
All right,

869
00:27:59,109 --> 00:28:01,699
see if we got an example of that on here anywhere.

870
00:28:02,189 --> 00:28:02,430
OK,

871
00:28:02,589 --> 00:28:03,589
so here's one,

872
00:28:03,630 --> 00:28:03,829
OK,

873
00:28:03,949 --> 00:28:04,900
right up here.

874
00:28:05,229 --> 00:28:06,339
That's acceptable.

875
00:28:07,680 --> 00:28:08,829
This is acceptable,

876
00:28:08,839 --> 00:28:09,400
and this

877
00:28:09,420 --> 00:28:12,709
one I'm circling right now is the most common way to do it.

878
00:28:13,550 --> 00:28:13,680
OK,

879
00:28:13,719 --> 00:28:14,829
a horizontal dimension,

880
00:28:14,959 --> 00:28:16,170
so this dimension,

881
00:28:17,199 --> 00:28:18,540
plus the angle.

882
00:28:21,219 --> 00:28:21,410
Use 

883
00:28:21,410 --> 00:28:26,170
the proper number of significant digits for the desired implicit tolerance.

884
00:28:26,579 --> 00:28:27,520
This is

885
00:28:27,709 --> 00:28:31,089
really important and something that many of you will overlook

886
00:28:31,500 --> 00:28:33,890
if you're not careful about it and thinking about it.

887
00:28:34,760 --> 00:28:35,290
OK,

888
00:28:35,449 --> 00:28:36,079
so,

889
00:28:36,369 --> 00:28:37,969
take a look at what we have going on right here,

890
00:28:38,050 --> 00:28:39,689
which is the length of this clamp,

891
00:28:40,130 --> 00:28:41,920
the length of the bar of this clamp.

892
00:28:42,290 --> 00:28:42,449
OK,

893
00:28:42,530 --> 00:28:45,359
it is listed as 10.2 inches.

894
00:28:46,469 --> 00:28:46,900
Now,

895
00:28:47,069 --> 00:28:49,859
there is a tolerance associated with this,

896
00:28:50,109 --> 00:28:53,349
and it comes straight from the title block tolerance,

897
00:28:53,609 --> 00:28:53,800
OK,

898
00:28:53,829 --> 00:28:55,400
which we find right down here,

899
00:28:55,750 --> 00:28:59,459
and we can see that when we are one decimal spot in,

900
00:29:00,709 --> 00:29:03,849
then it is going to be plus or minus 20,000 of an inch.

901
00:29:05,020 --> 00:29:05,359
OK,

902
00:29:05,479 --> 00:29:07,310
so this over here is plus,

903
00:29:08,239 --> 00:29:08,949
minus,

904
00:29:09,520 --> 00:29:11,400
I don't know why I'm trying to write this,

905
00:29:11,800 --> 00:29:14,989
0.02 inches.

906
00:29:15,880 --> 00:29:16,729
That's horrible.

907
00:29:16,869 --> 00:29:19,459
It's really hard to do that with my trackpad.

908
00:29:20,750 --> 00:29:20,989
All right,

909
00:29:21,109 --> 00:29:22,380
that just looks so stupid.

910
00:29:22,479 --> 00:29:22,979
Anyway,

911
00:29:23,229 --> 00:29:23,680
that

912
00:29:23,949 --> 00:29:26,109
is telling us the tolerance of that.

913
00:29:26,229 --> 00:29:26,390
Now,

914
00:29:26,439 --> 00:29:27,939
the default tolerance

915
00:29:28,270 --> 00:29:29,459
for solid works

916
00:29:29,829 --> 00:29:30,579
is this number.

917
00:29:30,609 --> 00:29:31,130
It is,

918
00:29:31,140 --> 00:29:31,550
excuse me,

919
00:29:31,670 --> 00:29:32,819
2 decimal

920
00:29:33,430 --> 00:29:33,939
spots,

921
00:29:33,989 --> 00:29:35,939
2 digits past the decimal spot.

922
00:29:36,109 --> 00:29:36,219
So,

923
00:29:36,229 --> 00:29:38,819
this would mean if we were to leave it that way,

924
00:29:39,229 --> 00:29:40,219
that we need

925
00:29:40,430 --> 00:29:42,829
this to be plus or minus 10,000 of an inch.

926
00:29:43,540 --> 00:29:46,540
And so, you need to go in and you need to adjust

927
00:29:47,270 --> 00:29:50,550
the number of significant digits for

928
00:29:50,829 --> 00:29:52,199
the tolerance that you need.

929
00:29:53,160 --> 00:29:53,439
All right,

930
00:29:53,540 --> 00:29:55,040
that is all we're gonna go over today.

931
00:29:55,119 --> 00:29:56,469
That's been 30 minutes,

932
00:29:56,839 --> 00:29:58,550
and those are the

933
00:29:59,000 --> 00:30:00,189
drawing standards.

934
00:30:00,459 --> 00:30:02,310
You're gonna need to stick with them

935
00:30:02,560 --> 00:30:03,310
and

936
00:30:03,680 --> 00:30:04,800
you're gonna need to understand them,

937
00:30:04,810 --> 00:30:06,880
and I've just given you a bunch of yes/noes,

938
00:30:06,959 --> 00:30:07,479
yes/noes,

939
00:30:07,599 --> 00:30:09,869
yes noes to try to help you visualize

940
00:30:10,319 --> 00:30:12,560
the difference between it being done right

941
00:30:12,920 --> 00:30:14,319
and it not being done right.

942
00:30:14,439 --> 00:30:14,989
OK.

943
00:30:15,479 --> 00:30:16,189
Good luck.

944
00:30:16,520 --> 00:30:20,109
Tie this to what you're reading in Section 5.7

945
00:30:20,280 --> 00:30:21,349
of the guidebook.

946
00:30:21,810 --> 00:30:22,099
You

947
00:30:22,140 --> 00:30:22,619
do this,

948
00:30:22,699 --> 00:30:25,969
you spend some time now learning it and it will stick with you,

949
00:30:26,339 --> 00:30:28,099
and it's gonna serve you well as you

950
00:30:28,099 --> 00:30:30,819
work all the engineering drawings for all the projects

951
00:30:31,099 --> 00:30:32,260
that will be turned in for this class.

952
00:30:32,349 --> 00:30:32,729
OK,

953
00:30:32,900 --> 00:30:33,630
thanks everyone.