0:00:00.910,0:00:01.789 Hey there everyone. 0:00:01.870,0:00:03.980 Welcome to our virtual lecture today. 0:00:04.190,0:00:06.579 Thank you for joining in and trying to 0:00:07.190,0:00:11.060 capture some of the things I would have wanted to tell you in person, 0:00:11.470,0:00:13.470 but due to COVID-related things, 0:00:13.550,0:00:15.220 I cannot be there right now. 0:00:15.960,0:00:16.979 Nevertheless, 0:00:17.590,0:00:18.250 welcome 0:00:18.510,0:00:19.459 to the class. 0:00:19.870,0:00:24.840 Objective for today is to better understand the engineering drawing standard. 0:00:25.430,0:00:29.500 This is going to be a part of the class from this time forward. 0:00:29.950,0:00:33.779 It will show up again and again and again and you're gonna need to know 0:00:34.029,0:00:34.549 how, 0:00:36.759,0:00:36.890 what 0:00:36.890,0:00:39.770 is required of you when making engineering drawings. 0:00:39.880,0:00:41.389 That's what we're trying to describe today. 0:00:41.720,0:00:42.750 But please, 0:00:44.569,0:00:44.670 be 0:00:44.670,0:00:48.680 aware that the things I'm describing to you right now are also on Learning Suite 0:00:49.130,0:00:51.159 under the content section, 0:00:51.490,0:00:53.930 and they are there for you to be able to 0:00:53.930,0:00:57.240 see basically everything we're gonna talk about right now. 0:00:58.090,0:00:59.560 But I'm just gonna talk through some of them 0:00:59.810,0:01:00.759 to help you. 0:01:01.169,0:01:01.360 Now, 0:01:01.409,0:01:01.840 also, 0:01:01.880,0:01:06.800 in section 5.7 of the guidebook where engineering part drawings are discussed, 0:01:07.209,0:01:07.769 this page, 0:01:07.809,0:01:10.769 the page you're seeing right here shows 28 standards. 0:01:11.589,0:01:17.099 22 of them are industry standards and 6 of them are company standards 0:01:17.440,0:01:20.440 and this concept is important to understand. 0:01:20.589,0:01:22.019 Please go look at this 0:01:22.550,0:01:28.190 and try to follow along with these standards and the pictures that follow them 0:01:28.470,0:01:31.190 where each of these standards are sort of discussed, 0:01:31.800,0:01:32.400 and 0:01:32.569,0:01:33.489 pointed out. 0:01:33.610,0:01:34.599 Though I'll tell you now, 0:01:34.800,0:01:38.489 this part of the guidebook will be way more understandable if you 0:01:38.489,0:01:40.639 stick with this video and watch it through to the end. 0:01:40.860,0:01:42.839 Plus speed it up and watch it as fast as you can, 0:01:42.889,0:01:43.410 OK? 0:01:43.930,0:01:44.209 All right, 0:01:44.410,0:01:47.319 the example used in this visual guide 0:01:47.610,0:01:48.819 is the clamp shown here, 0:01:48.849,0:01:50.739 which is a Bessey 6-inch clamp. 0:01:51.610,0:01:51.849 We 0:01:51.889,0:01:53.040 modeled this 0:01:53.209,0:01:59.059 and chose it specifically because it could be used to demonstrate all of the 0:02:00.010,0:02:01.750 engineering drawing standards, 0:02:01.760,0:02:02.279 OK? 0:02:02.489,0:02:03.639 Before we talk about the standards though, 0:02:03.839,0:02:06.309 super valuable for you to know that, "Above all, 0:02:06.720,0:02:07.989 drawings should be clear, 0:02:08.479,0:02:08.869 complete, 0:02:09.000,0:02:10.429 and unambiguous." 0:02:10.800,0:02:13.940 Now it's valuable to create drawings that are also pleasing to look at 0:02:14.199,0:02:17.119 and require the least amount of energy to be correctly understood, 0:02:17.130,0:02:19.270 and that's what the standard is all about. 0:02:19.720,0:02:19.960 OK? 0:02:20.039,0:02:21.350 But to understand the standard, 0:02:21.419,0:02:22.580 you're gonna need to know 0:02:22.759,0:02:24.399 the following words. 0:02:24.589,0:02:26.470 First of words you're gonna need to know are. 0:02:27.020,0:02:28.130 You're gonna need to know 0:02:28.460,0:02:29.690 what a Sheet Format is? 0:02:29.899,0:02:30.610 That's 0:02:30.979,0:02:33.589 basically the overall sheet size 0:02:34.770,0:02:35.869 and its format, 0:02:35.949,0:02:37.509 which is like these lines around the side, 0:02:37.669,0:02:37.869 OK? 0:02:37.880,0:02:38.869 And then the Title Block, 0:02:38.949,0:02:42.259 which is this thing down in the bottom right-hand corner. 0:02:43.710,0:02:43.979 All right, 0:02:44.059,0:02:45.529 what else are you gonna need to know? 0:02:45.779,0:02:46.979 You're gonna need to know that 0:02:47.830,0:02:51.190 these things in this area are called isometric, 0:02:51.509,0:02:51.940 excuse me, 0:02:51.990,0:02:53.649 called orthographic views. 0:02:53.660,0:02:55.460 These are orthographic projections. 0:02:55.789,0:02:57.309 In this area right up here, 0:02:57.550,0:03:00.059 these are our isometric views, 0:03:00.389,0:03:00.630 OK? 0:03:00.669,0:03:03.389 And then we have Auxiliary Views such as these, 0:03:03.470,0:03:05.860 but there are many kinds of auxiliary views. 0:03:06.190,0:03:07.869 This is called the Detail View. 0:03:08.309,0:03:12.229 The Detail View is being pointed out right in this area 0:03:12.649,0:03:13.580 with the A 0:03:13.889,0:03:16.809 and then it is zoomed into that area right in here, 0:03:16.889,0:03:17.880 and we can see what's going on. 0:03:17.929,0:03:18.330 But 0:03:18.570,0:03:19.600 there are also 0:03:19.880,0:03:20.970 Section Views, 0:03:21.270,0:03:22.410 Scales Views, 0:03:22.649,0:03:23.839 Cutaway Views, 0:03:24.169,0:03:25.570 all kinds of views can be done. 0:03:25.610,0:03:27.490 These are all called Auxiliary Views. 0:03:27.529,0:03:28.479 You need to know those 0:03:28.729,0:03:29.699 words as well. 0:03:31.440,0:03:32.029 All right, 0:03:32.160,0:03:36.509 other thing that's going on here is that there is an Assembly Drawing, 0:03:36.880,0:03:38.559 and there are Part Drawings. 0:03:38.720,0:03:39.520 Assembly drawings, 0:03:39.529,0:03:44.429 as shown on the left are a collection of a whole bunch of parts, 0:03:44.800,0:03:47.529 and a really important part of the assembly drawing 0:03:47.529,0:03:50.429 is the bill of materials or the parts list. 0:03:50.440,0:03:51.470 It is sometimes called, 0:03:51.479,0:03:52.960 and it's this thing that's right here. 0:03:53.830,0:03:57.119 And each one of these parts in the Parts List 0:03:57.470,0:03:59.210 refers to 0:03:59.779,0:04:00.589 another 0:04:00.759,0:04:01.550 CAD model. 0:04:02.720,0:04:03.770 And it has 0:04:03.910,0:04:06.649 its own drawing like what we see right over here. 0:04:06.940,0:04:07.160 So, 0:04:07.179,0:04:09.589 the Assembly Drawing is just the assembly 0:04:09.979,0:04:11.509 of all the pieces, 0:04:11.860,0:04:14.369 and then all the parts are separate 0:04:14.740,0:04:15.899 drawings. 0:04:15.940,0:04:16.178 OK, 0:04:16.220,0:04:18.238 they're controlled differently and so on and so forth, 0:04:18.298,0:04:19.178 they're separate drawings. 0:04:19.260,0:04:19.690 OK, 0:04:19.940,0:04:20.420 next piece. 0:04:21.329,0:04:21.528 Alright, 0:04:21.608,0:04:24.648 we just talked a second ago about the bill of materials or the parts list, 0:04:24.688,0:04:27.498 which is a list of all the parts and the quantity 0:04:27.769,0:04:29.718 of those parts in the assembly. 0:04:30.128,0:04:30.919 And then 0:04:31.449,0:04:33.819 in the Part Drawings and Assembly Drawings, 0:04:33.829,0:04:34.718 we have notes. 0:04:35.169,0:04:37.878 Those notes always appear directly above 0:04:38.398,0:04:39.209 the title block. 0:04:41.940,0:04:47.109 Another really important thing, in the title block is the title block tolerances. 0:04:47.369,0:04:49.619 The title block tolerances specify 0:04:49.929,0:04:52.239 how precise a part needs to be made, 0:04:52.690,0:04:55.399 and in our title block that we use for the class, 0:04:55.690,0:04:59.279 both inch and millimeter are specified in the same one, 0:04:59.730,0:05:00.359 and 0:05:00.890,0:05:04.200 this helps us to know the precision of the parts that need to be made. 0:05:04.730,0:05:05.279 All right. 0:05:05.690,0:05:05.809 Now, 0:05:05.820,0:05:09.399 a few more things you need to know before we even get into the standards, 0:05:09.809,0:05:11.209 some vocabulary, 0:05:11.570,0:05:11.890 this 0:05:12.010,0:05:14.160 is called a Dimension Line. 0:05:14.290,0:05:16.929 The dimension line has an arrow on the end of it, 0:05:18.260,0:05:20.790 and it always has a dimension in the middle of it. 0:05:21.630,0:05:24.700 An Extension Line is the thing that the arrow is pointing to, 0:05:24.709,0:05:25.700 and it always 0:05:26.029,0:05:28.619 comes close to but does not touch the part. 0:05:29.190,0:05:29.309 See, 0:05:29.350,0:05:31.299 like right there's a little visual gap, 0:05:31.500,0:05:31.869 OK. 0:05:32.779,0:05:35.399 We also have things that are called Detail Markers. 0:05:35.459,0:05:38.540 These are usually circles with a letter next to them, 0:05:38.700,0:05:40.540 but they can also be squares and other things, 0:05:40.660,0:05:42.179 but the default is a circle, 0:05:42.220,0:05:44.059 and that's called a Detail Marker. 0:05:44.260,0:05:44.660 In this case, 0:05:44.670,0:05:46.209 it's Detail A Marker. 0:05:46.660,0:05:46.899 OK, 0:05:46.980,0:05:48.489 then we also have Part Line. 0:05:48.679,0:05:52.540 The part line means that it is a line connected to the actual part, 0:05:52.619,0:05:53.690 the geometry. 0:05:53.940,0:05:54.089 Now, 0:05:54.100,0:05:54.670 in this image, 0:05:54.739,0:05:57.170 you can see that the Dimension Line, 0:05:57.299,0:05:57.929 this one, 0:05:58.140,0:06:00.410 and the Extension Line are somewhat gray. 0:06:01.260,0:06:03.170 And so, you can sort of tell the difference between a 0:06:03.170,0:06:05.899 Part Line and sort of an Annotation Line, 0:06:06.309,0:06:06.820 but 0:06:07.709,0:06:11.959 sometimes these both appear as black and sometimes have very similar line weights. 0:06:12.309,0:06:12.940 And 0:06:13.070,0:06:13.619 so, 0:06:13.790,0:06:14.750 it's, 0:06:14.790,0:06:15.720 if you follow the standards, 0:06:15.790,0:06:17.940 you can tell what the differences are between them, 0:06:18.269,0:06:20.429 but be aware that there is a Part Line and 0:06:20.429,0:06:23.329 then there are Dimension Lines and there are Extension Lines. 0:06:23.670,0:06:26.829 Now Leader Line is another kind of thing and it 0:06:26.829,0:06:29.869 is sort of like a dimension and an extension 0:06:30.480,0:06:34.100 line all put into one for arcs and circles, 0:06:34.519,0:06:34.679 OK? 0:06:34.720,0:06:36.839 We also have two more things going on here that we need to know, 0:06:36.850,0:06:38.230 and that's the Hidden Line. 0:06:38.440,0:06:39.079 The Hidden Line, 0:06:39.089,0:06:39.390 of course, 0:06:39.440,0:06:40.709 is the dashed line 0:06:41.119,0:06:43.429 that appears on things, 0:06:43.760,0:06:45.790 and then we have our center line. 0:06:46.079,0:06:47.630 And our center line is 0:06:48.040,0:06:49.549 or the center marker, 0:06:49.839,0:06:49.959 right, 0:06:50.040,0:06:52.390 this is probably better said as a center marker, 0:06:52.679,0:06:55.989 but that points to the center of the circle in this case. 0:06:57.459,0:06:57.929 All right. 0:06:58.019,0:06:58.570 And then, 0:06:58.779,0:06:59.820 here is the Center Line. 0:06:59.859,0:07:01.970 This is probably what we should have said before. 0:07:02.100,0:07:03.929 The other page was Center Marker. 0:07:04.179,0:07:05.380 This one is a Center Line. 0:07:05.420,0:07:07.100 The Center Line is a long, 0:07:07.260,0:07:07.500 short, 0:07:07.619,0:07:07.739 long, 0:07:07.820,0:07:08.019 short, 0:07:08.079,0:07:08.220 long, 0:07:08.269,0:07:09.140 short dash line. 0:07:10.679,0:07:12.980 And it represents the center of anything. 0:07:13.019,0:07:13.489 In this case, 0:07:13.540,0:07:15.359 it's the center between what we 0:07:15.619,0:07:16.160 would guess, 0:07:16.260,0:07:16.480 you know, 0:07:16.579,0:07:18.290 these two lines are equally 0:07:18.700,0:07:20.459 separated from that center line. 0:07:21.279,0:07:21.549 All right, 0:07:21.589,0:07:24.779 a few more things we gotta know in terms of understanding 0:07:24.950,0:07:26.450 our vocabulary. 0:07:27.149,0:07:27.619 OK. 0:07:27.829,0:07:29.380 This is a section view. 0:07:29.549,0:07:32.820 I know it's a section view because it has cross-hatched material. 0:07:33.269,0:07:35.339 That means if we sort of slice the product 0:07:35.640,0:07:37.140 right down this line, 0:07:37.470,0:07:38.600 that's right here, 0:07:39.029,0:07:39.299 whoa, 0:07:39.950,0:07:40.619 that's horrible, 0:07:40.950,0:07:41.170 and 0:07:41.209,0:07:43.220 then look in the direction of A, 0:07:44.130,0:07:45.959 A and A we will see 0:07:46.529,0:07:47.410 section A-A, 0:07:47.420,0:07:48.690 and this is section A-A. 0:07:48.700,0:07:49.959 It's being specified right there. 0:07:50.250,0:07:51.959 And anytime there's a cross-hatch, 0:07:52.170,0:07:54.239 that means we're looking at solid material, 0:07:54.529,0:07:57.559 and anytime there's no cross-hatch like in this hole, 0:07:58.250,0:07:59.799 we know we're looking at air, 0:08:00.290,0:08:00.489 OK, 0:08:00.570,0:08:02.399 which is exactly what's happening when you're, 0:08:02.609,0:08:04.000 you can look right down here at this, 0:08:04.010,0:08:04.500 OK? 0:08:04.649,0:08:08.239 There is a hole in the middle of that and so that's what we're seeing right there. 0:08:08.899,0:08:09.200 All right, 0:08:09.420,0:08:09.630 wow, 0:08:09.839,0:08:10.959 I can't really see what's going on. 0:08:11.000,0:08:12.089 Let me get rid of some of these, 0:08:12.209,0:08:12.579 let's 0:08:12.640,0:08:14.010 get rid of some of this. 0:08:14.660,0:08:14.799 OK, 0:08:14.920,0:08:17.049 what else do we have on here that we need to look at? 0:08:17.559,0:08:17.929 OK. 0:08:18.079,0:08:18.640 We 0:08:20.000,0:08:22.890 have already said that, that up at the top is the section view. 0:08:23.399,0:08:26.190 We have the section view title and scale. 0:08:26.480,0:08:26.600 OK, 0:08:26.640,0:08:28.809 the scale auto-populates in there. 0:08:29.739,0:08:30.059 OK. 0:08:30.140,0:08:31.059 And then what else do we have? 0:08:31.100,0:08:33.179 We have the Section Line and the Section Marker. 0:08:33.299,0:08:35.169 We've sort of already talked about those ones. 0:08:35.340,0:08:35.520 OK, 0:08:35.619,0:08:36.729 those were the 0:08:37.099,0:08:39.250 vocabulary that you need to know 0:08:39.659,0:08:41.929 as we start to get now into the 0:08:42.219,0:08:42.989 drawing standard. 0:08:43.789,0:08:46.348 I'm not going to read every word that's on these slides. 0:08:46.739,0:08:46.855 These 0:08:46.855,0:08:48.898 are in the style guide, 0:08:49.229,0:08:49.939 which 0:08:50.028,0:08:50.838 is 0:08:51.309,0:08:53.508 online for you to see for 0:08:53.508,0:08:55.968 the drawing standard under the graphical standards. 0:08:56.588,0:08:56.690 But 0:08:56.690,0:08:59.818 I will just step through them and try to make them clear for you. 0:09:00.028,0:09:00.429 All right? 0:09:00.698,0:09:00.939 So, 0:09:00.948,0:09:01.539 first of all, 0:09:01.588,0:09:05.109 all of the drawings you create in this class need to be made on B-sized drawing. 0:09:05.189,0:09:06.578 That's 11 by 17. 0:09:06.828,0:09:08.018 You'll never be asked to print, 0:09:08.189,0:09:08.588 so it's OK. 0:09:08.669,0:09:11.499 You're just going to turn in these digital ones at 11 by 17, 0:09:11.989,0:09:12.429 OK? 0:09:13.219,0:09:13.890 So please, 0:09:14.020,0:09:16.820 do not do them on a smaller sheet. 0:09:17.099,0:09:18.770 Do not do them in a portrait sheet. 0:09:18.979,0:09:19.260 Yes, 0:09:19.619,0:09:21.289 always do them in a 0:09:21.780,0:09:23.669 B-sized landscape 0:09:24.219,0:09:24.710 view. 0:09:25.260,0:09:25.539 All right, 0:09:25.700,0:09:31.299 all MeEn 272 drawings should use the provided MeEn 272 B-sized landscape sheet format. 0:09:31.919,0:09:33.880 And maybe we just ask ourselves why. 0:09:34.409,0:09:35.130 Actually, 0:09:35.609,0:09:37.849 we have taken a traditional 0:09:39.359,0:09:42.590 sheet format that you might find in industries such as this one, 0:09:42.880,0:09:45.479 and we have simplified it down to just the 0:09:45.479,0:09:47.549 core things that are important for this class. 0:09:48.070,0:09:49.510 It's the one we get right down here, 0:09:49.719,0:09:51.590 and it's actually easier for you 0:09:51.789,0:09:54.299 to not have to go seek a whole bunch of approvals, 0:09:54.520,0:09:56.630 but instead just have one person check your drawing, 0:09:56.640,0:09:57.869 and it's just easier, 0:09:57.880,0:09:58.559 easier, 0:09:58.599,0:10:00.830 easier to use the formats that we have given you. 0:10:01.320,0:10:03.950 Use the Getting Started Link in Learning Suite if 0:10:03.950,0:10:05.679 you haven't figured out yet how to do this. 0:10:07.270,0:10:07.539 All right, 0:10:07.659,0:10:08.650 hidden lines 0:10:08.979,0:10:12.530 should be shown in standard orthographic views of part drawings. 0:10:12.820,0:10:14.130 Let's see what this looks like. 0:10:14.299,0:10:14.859 OK? 0:10:15.340,0:10:15.539 Yes, 0:10:15.700,0:10:16.900 we should have hidden lines. 0:10:16.979,0:10:21.369 You can see all the hidden lines in these standard orthographic views. 0:10:21.739,0:10:25.179 These are really helpful for us to understand what's going on in the product, 0:10:25.219,0:10:26.780 and they're expected to be there. 0:10:28.809,0:10:29.130 All right, 0:10:29.330,0:10:30.489 hidden lines 0:10:30.809,0:10:31.690 should not be shown, 0:10:31.729,0:10:32.210 however, 0:10:32.369,0:10:33.450 if they're too busy. 0:10:34.200,0:10:34.710 All right, 0:10:34.840,0:10:39.950 and here we can see in this view down here all the hidden lines have been removed 0:10:40.479,0:10:42.760 because it's already super busy and what does it 0:10:42.760,0:10:44.549 look like when the hidden lines are there? 0:10:44.960,0:10:45.989 It looks like this 0:10:46.320,0:10:48.539 and it becomes virtually unusable. 0:10:48.679,0:10:52.030 So, in some cases you may choose to turn off 0:10:52.679,0:10:55.000 the Hidden Lines in a particular view if it is 0:10:55.000,0:10:57.840 obscuring the view and making it too, too busy. 0:10:59.419,0:10:59.580 All right, 0:10:59.700,0:11:01.619 hidden lines should not be shown on isometric 0:11:01.619,0:11:03.940 views nor on section views of part drawings. 0:11:04.849,0:11:05.169 All right, 0:11:05.409,0:11:06.210 so here we go. 0:11:06.330,0:11:07.640 Here's our isometric view. 0:11:07.969,0:11:09.859 We should not show hidden lines in this view. 0:11:09.969,0:11:10.330 Instead, 0:11:10.450,0:11:11.520 they should appear like this. 0:11:13.609,0:11:13.969 Why? 0:11:14.130,0:11:16.090 Because it's just too busy and too hard to 0:11:16.090,0:11:18.500 understand where those hidden lines are actually at. 0:11:18.929,0:11:20.840 Now in the cross-sectional views, 0:11:21.010,0:11:23.919 we also do not look at hidden lines. 0:11:24.090,0:11:26.119 So, this is what a cross-section view should look like. 0:11:26.210,0:11:28.919 It should not look like this one that's up here. 0:11:29.330,0:11:29.549 Why? 0:11:29.729,0:11:32.789 Because the section view is trying to show the detail at the section. 0:11:32.849,0:11:35.010 It doesn't want to show the detail everywhere else. 0:11:38.099,0:11:39.900 Hidden lines should not be shown in assembly 0:11:39.900,0:11:43.770 drawings, unless visual or technical clarity requires it. 0:11:44.140,0:11:44.489 So, 0:11:44.659,0:11:45.219 for example, 0:11:45.409,0:11:47.059 this is a pretty good view 0:11:47.500,0:11:48.580 of the 0:11:49.200,0:11:50.820 Bessey 6-inch clamp. 0:11:51.549,0:11:53.780 Here is a not-so-good view. 0:11:54.309,0:11:58.580 It is produced just extra information that isn't super useful 0:11:59.309,0:11:59.940 necessarily. 0:12:00.239,0:12:03.739 Now I think one exception for this might be in this region 0:12:04.109,0:12:05.960 where you want to sort of figure out 0:12:06.309,0:12:10.659 how far does a metal shaft go into this wooden handle, 0:12:11.030,0:12:11.849 but for the most part, 0:12:11.909,0:12:15.179 we do not put hidden lines on assembly drawings. 0:12:16.400,0:12:19.960 Views should be selected to minimize the number of hidden lines. 0:12:21.049,0:12:21.590 OK. 0:12:22.830,0:12:24.049 Let's just see how this works, 0:12:24.130,0:12:24.409 OK? 0:12:24.530,0:12:26.559 Here's the handle of the Bessey clamp. 0:12:26.969,0:12:28.520 In this particular view, 0:12:28.690,0:12:29.400 I have 0:12:29.690,0:12:31.900 a front view and I have a top view, 0:12:32.210,0:12:33.719 and then over here is a section view, 0:12:33.849,0:12:34.609 obviously, 0:12:35.190,0:12:35.479 and 0:12:35.520,0:12:37.599 by its orientation 0:12:37.770,0:12:38.900 up in this area, 0:12:38.909,0:12:41.489 there are all kinds of hidden lines. 0:12:42.330,0:12:45.419 But if I flip the whole thing around 0:12:45.909,0:12:47.859 and have my front view here, 0:12:48.700,0:12:50.340 and this is my top view, 0:12:50.739,0:12:50.940 now, 0:12:50.979,0:12:52.619 I have no hidden lines. 0:12:52.820,0:12:52.929 So, 0:12:52.940,0:12:56.289 we always want to choose the orientation of 0:12:56.859,0:12:57.450 views, 0:12:57.619,0:12:58.330 such that 0:12:58.500,0:13:00.940 the number of hidden lines is minimized. 0:13:02.239,0:13:02.400 All right, 0:13:02.450,0:13:05.679 the most descriptive view of the product should be chosen as the front view. 0:13:07.960,0:13:09.109 Why is this important? 0:13:09.260,0:13:09.789 Well, 0:13:10.359,0:13:10.760 first of all, 0:13:10.840,0:13:11.640 it's just natural. 0:13:11.799,0:13:14.510 So, this is all really good right up here. 0:13:14.919,0:13:18.809 This is what I deem to be the most descriptive view of the product, 0:13:19.280,0:13:20.710 not this. 0:13:21.440,0:13:21.559 OK, 0:13:21.640,0:13:23.599 this is not the most descriptive view of the product. 0:13:23.679,0:13:23.789 So, 0:13:23.799,0:13:25.030 we do not want 0:13:25.520,0:13:26.080 to choose this. 0:13:26.119,0:13:28.390 We want to choose the most descriptive view, 0:13:28.679,0:13:29.549 like this one 0:13:30.000,0:13:31.000 to be the front view. 0:13:31.200,0:13:32.200 That is the standard. 0:13:33.429,0:13:33.700 All right. 0:13:33.900,0:13:37.890 Isometric views of parts should be placed in the upper right area of the drawing. 0:13:39.229,0:13:42.419 Now this is a good time for me just to pause and say that in the 0:13:42.840,0:13:46.099 section of the guidebook there are two kinds of standards that are described. 0:13:46.109,0:13:47.549 One is the industry-wide standard. 0:13:47.630,0:13:49.200 One is the company-wide standard. 0:13:49.630,0:13:52.099 This one is not an industry-wide standard, 0:13:52.429,0:13:55.099 but it is the standard I want you to use in this class, 0:13:55.349,0:13:58.989 which is that the isometric view goes up into the top right view. 0:14:00.840,0:14:02.070 Not down here. 0:14:02.840,0:14:02.849 Not 0:14:03.330,0:14:05.239 off to the side over here, 0:14:05.510,0:14:06.400 not anywhere else, 0:14:06.510,0:14:08.770 want to have it right up in this area. 0:14:09.109,0:14:13.070 I'm liking it right up in that area because in the olden days when these kinds 0:14:13.070,0:14:16.099 of things used to be printed and there still are some people who print these, 0:14:16.859,0:14:19.340 this would be bound along this side, 0:14:19.909,0:14:21.900 and you would want to thumb through 0:14:22.309,0:14:25.429 the sheets without opening up each sheet to get a very 0:14:25.429,0:14:28.400 quick view of what it is. And having it in this area 0:14:28.830,0:14:30.989 with the title block also on the right side 0:14:31.469,0:14:35.270 helps to know what the drawing is all about with having to open up the entire sheet. 0:14:37.390,0:14:40.229 Views should not be shaded or rendered on any drawing. 0:14:41.390,0:14:41.590 OK, 0:14:41.679,0:14:44.150 this is also a company standard actually, 0:14:44.630,0:14:44.900 but 0:14:44.909,0:14:48.820 it is derived from the notion that 0:14:49.349,0:14:49.729 in 0:14:49.750,0:14:53.460 the olden days when drawings like this would be photocopied, 0:14:55.000,0:14:56.590 information 0:14:55.590,0:14:57.140 would become obscured 0:14:57.520,0:14:59.239 in these dark areas. 0:14:59.390,0:15:00.570 So, it's better, 0:15:00.760,0:15:02.820 just much better to not do that 0:15:03.109,0:15:04.099 and just have 0:15:04.390,0:15:05.590 no shaded views in there. 0:15:05.659,0:15:07.340 So, this is how we want it to be. 0:15:07.590,0:15:08.619 We don't want this, 0:15:09.190,0:15:10.099 we do want this. 0:15:11.169,0:15:11.419 All right, 0:15:11.539,0:15:14.080 each part must be fully dimensioned and no redundant 0:15:14.080,0:15:17.869 dimensions should be present in an engineering drawing. 0:15:18.200,0:15:18.440 So, 0:15:18.479,0:15:19.830 take a look at this one for a second, 0:15:19.919,0:15:21.590 see if you can see why 0:15:21.960,0:15:24.710 one of these is good and why one of these is not 0:15:24.710,0:15:24.820 good. 0:15:36.250,0:15:36.739 OK, 0:15:36.840,0:15:38.270 even I'm having a hard time with this one. 0:15:38.349,0:15:38.640 Let's see. 0:15:38.710,0:15:38.869 OK, 0:15:38.950,0:15:40.510 so that's the same on both drawings. 0:15:40.669,0:15:41.109 Oh yes, 0:15:41.190,0:15:41.390 OK, 0:15:41.429,0:15:42.539 we are missing 0:15:42.710,0:15:43.500 this one 0:15:43.909,0:15:45.340 is one that we want, 0:15:45.669,0:15:47.460 and it's not present over here, 0:15:47.549,0:15:49.830 so I don't know how to make this with 0:15:51.969,0:15:52.149 unless 0:15:52.149,0:15:53.890 I have it specified on the drawing. 0:15:54.010,0:15:54.140 So, 0:15:54.169,0:15:56.119 I need to have all my information there, 0:15:56.450,0:15:59.219 and then I do not want to have redundant information. 0:15:59.330,0:15:59.520 So, 0:15:59.570,0:16:01.450 this is redundant information, 0:16:01.809,0:16:03.450 as you can see in this area right here. 0:16:03.489,0:16:05.140 It's redundant because 0:16:06.849,0:16:11.239 1.05 plus 0.6 is equal to 1.65. 0:16:11.409,0:16:14.630 So, this dimension is redundant and should not be there, 0:16:14.690,0:16:15.260 or frankly, 0:16:15.369,0:16:16.320 any one of these. 0:16:16.570,0:16:17.570 This one could be redundant, 0:16:17.609,0:16:17.849 this one, 0:16:17.929,0:16:19.109 all three of these are redundant, 0:16:19.239,0:16:20.400 maybe is the way to say it. 0:16:22.380,0:16:24.869 For two dimensions that apply to the same dimension, 0:16:25.099,0:16:29.090 one should be indicated as a reference dimension with the parentheses or 0:16:29.780,0:16:31.429 with the notation "REF." 0:16:32.840,0:16:33.119 OK, 0:16:33.280,0:16:33.729 so 0:16:34.049,0:16:34.549 for example, 0:16:34.679,0:16:35.400 let's see if we can find this, 0:16:35.479,0:16:35.880 OK? 0:16:36.000,0:16:36.630 We 0:16:36.760,0:16:37.229 can, 0:16:37.239,0:16:39.309 whenever there's a parenthesis like this one, 0:16:39.640,0:16:41.229 it means it's a reference dimension. 0:16:41.400,0:16:43.950 It means there is a redundancy associated with this, 0:16:43.960,0:16:45.190 but it may be useful 0:16:45.479,0:16:46.880 for someone to know this dimension, 0:16:46.960,0:16:48.510 so they don't have to calculate it out 0:16:48.919,0:16:49.510 or 0:16:49.919,0:16:51.609 the word "REF" is typed in there. 0:16:54.429,0:16:56.710 Dimension lines should be placed so they are easily understood 0:16:56.710,0:16:59.150 and do not interfere with the part or assembly lines. 0:17:00.590,0:17:00.830 So, 0:17:00.909,0:17:01.750 let's see how we did here. 0:17:01.830,0:17:03.109 This one's looking pretty good. 0:17:03.270,0:17:05.030 This is the Cap that goes on the end of the 0:17:05.189,0:17:05.510 clamp, 0:17:05.550,0:17:09.098 so you don't mar up the wood or whatever soft material you're touching. 0:17:09.430,0:17:10.329 All of these 0:17:10.630,0:17:11.430 extension lines, 0:17:11.469,0:17:12.469 we're talking about extension lines. 0:17:12.510,0:17:13.410 I'm gonna go 0:17:13.790,0:17:15.300 extension lines for a second, 0:17:15.310,0:17:15.520 yeah. 0:17:15.630,0:17:15.858 So, 0:17:17.810,0:17:18.000 yes, 0:17:18.040,0:17:18.190 that's 0:17:18.190,0:17:18.400 good. 0:17:18.439,0:17:19.750 Let's look at the bad version of this, 0:17:19.800,0:17:20.358 OK? 0:17:20.760,0:17:20.979 Here, 0:17:21.118,0:17:24.810 the Leader Line is not clearly pointing to one feature for this, 0:17:25.160,0:17:26.310 so that's really bad. 0:17:26.598,0:17:27.750 And then over here 0:17:28.079,0:17:29.989 we have the Dimension Line, 0:17:30.079,0:17:33.270 which is the one with the arrow on it interfering with the Part Lines. 0:17:33.560,0:17:34.319 That's not good. 0:17:34.439,0:17:35.640 We don't like that. 0:17:35.800,0:17:36.760 We don't like that at all. 0:17:38.140,0:17:38.449 OK, 0:17:38.810,0:17:42.010 dimensions should not be placed on isometric views. 0:17:42.170,0:17:45.199 They should not be placed on isometric views because 0:17:46.010,0:17:48.280 we know that if we draw a circle 0:17:49.130,0:17:50.680 in an isometric view, 0:17:50.770,0:17:52.560 it's shown as an ellipse 0:17:52.849,0:17:54.000 in the isometric view. 0:17:54.050,0:17:54.880 And so, 0:17:55.410,0:17:57.989 if we try to dimension things in 0:17:58.689,0:17:59.530 an isometric view, 0:17:59.609,0:18:00.349 we are not 0:18:00.530,0:18:02.239 measuring their true size, 0:18:02.489,0:18:03.969 it's some other thing. 0:18:04.390,0:18:05.430 And in solid works, 0:18:05.469,0:18:06.380 if you try to do it, 0:18:06.430,0:18:07.199 it will tell you, 0:18:07.280,0:18:09.829 it will automatically put this word "TRUE" in front of it, 0:18:10.189,0:18:11.510 but I don't want you to ever do that. 0:18:11.589,0:18:11.989 It's 0:18:12.109,0:18:13.270 not good, 0:18:13.310,0:18:15.180 it's not part of the industry standard 0:18:15.979,0:18:16.949 to dimension 0:18:17.300,0:18:18.020 isometric views, 0:18:18.099,0:18:20.260 we never want to dimension isometric views. 0:18:21.589,0:18:22.109 All right, 0:18:22.300,0:18:24.540 dimensions should be placed as close to the part. 0:18:24.949,0:18:26.270 For successive dimensions, 0:18:26.290,0:18:27.650 they should be close to each other. 0:18:27.989,0:18:29.619 So, here's an example of this. 0:18:30.060,0:18:30.109 We 0:18:30.150,0:18:31.489 do not like this, 0:18:31.560,0:18:31.790 OK? 0:18:31.910,0:18:33.750 This is like, these parts, 0:18:33.869,0:18:37.300 these dimensions are so far away from the part it's uncomfortable, 0:18:37.510,0:18:39.160 just super uncomfortable to look at. 0:18:39.439,0:18:39.849 Instead, 0:18:39.880,0:18:42.189 we want to place them neat and tidy 0:18:42.589,0:18:44.060 and near each other 0:18:44.670,0:18:45.310 like this. 0:18:46.449,0:18:46.670 OK, 0:18:46.709,0:18:49.020 this is also a good time for me to just remind you that 0:18:49.229,0:18:50.709 I did not make up these standards. 0:18:50.829,0:18:53.579 These standards are ones that have been used for decades, 0:18:53.949,0:18:55.339 but they are good, 0:18:55.670,0:18:55.829 right? 0:18:55.949,0:18:59.699 They do help to make it so that every time you see an engineering drawing 0:19:00.099,0:19:01.229 in the future, 0:19:01.270,0:19:05.219 it will not feel as foreign as it does to you right now when you're learning. 0:19:05.430,0:19:05.829 Instead, 0:19:05.869,0:19:08.709 you start to see the common things again and again and again and 0:19:08.709,0:19:11.910 it will start to feel natural and be easier to read over time. 0:19:12.290,0:19:12.540 All right, 0:19:12.599,0:19:13.640 on to this next one then, 0:19:13.739,0:19:18.589 which is that dimensions should generally be placed between orthogonal views. 0:19:18.800,0:19:21.030 So, just take a look at what's going on here. 0:19:21.400,0:19:25.229 All of these dimensions are placed in between this view 0:19:25.560,0:19:26.250 and this view. 0:19:26.439,0:19:30.109 So, we call these two views orthogonal because they're 90-degree projections 0:19:30.400,0:19:31.270 of each other, 0:19:31.680,0:19:33.930 and the dimension is placed between them 0:19:34.239,0:19:36.400 as opposed to what's going on over here 0:19:36.400,0:19:38.599 where the dimensions are not placed between them. 0:19:39.050,0:19:41.819 The reason why this is valuable is that 0:19:42.020,0:19:44.170 if you just take a look at what's going on right here 0:19:44.719,0:19:45.670 in this area, 0:19:45.680,0:19:47.170 there are two hidden lines, 0:19:47.339,0:19:48.020 right? 0:19:48.219,0:19:50.350 If I want to know which 0:19:50.350,0:19:50.660 dimension 0:19:51.380,0:19:51.630 this, 0:19:51.780,0:19:51.939 you know, 0:19:52.060,0:19:54.449 which hidden line this dimension is applied to, 0:19:54.780,0:19:59.410 it's a little bit easier for me to do when that dimension has extension lines that are 0:19:59.739,0:20:01.619 going near this other view. 0:20:02.530,0:20:02.959 OK, 0:20:03.109,0:20:03.910 so can 0:20:03.989,0:20:04.939 I figure that out? 0:20:05.030,0:20:05.430 I don't know. 0:20:05.670,0:20:05.790 See, 0:20:06.109,0:20:08.020 this is the bottom of the cutout, 0:20:08.390,0:20:10.459 and this is the top of the fillet. 0:20:10.869,0:20:11.150 OK, 0:20:11.270,0:20:11.660 so this, 0:20:11.709,0:20:12.949 if I could draw a straight line, 0:20:13.030,0:20:14.060 which I don't know if I can, 0:20:14.160,0:20:14.530 but 0:20:14.829,0:20:16.660 basically that's what's going on there. 0:20:16.869,0:20:19.229 That's easier to tell than when I'm over here, 0:20:20.489,0:20:20.959 you know, 0:20:21.869,0:20:24.449 I get to the same line because I already know what it is now, 0:20:24.680,0:20:25.089 but 0:20:25.300,0:20:27.489 we want to sort of put those dimensions in between them, 0:20:27.660,0:20:31.810 it allows for the dimensions to be more shareable across the orthogonal 0:20:32.180,0:20:32.699 views. 0:20:34.400,0:20:37.310 Dimension lines should not cross, 0:20:38.660,0:20:41.800 and should not cross part lines or extension lines, 0:20:41.880,0:20:42.430 OK? 0:20:42.640,0:20:42.760 Yeah, 0:20:42.920,0:20:45.579 we don't want to have a bunch of lines crossing each other. 0:20:45.750,0:20:47.199 So, let's go look at what's going on here, 0:20:47.239,0:20:47.680 OK? 0:20:47.880,0:20:50.160 This one over here is obviously looking good. 0:20:50.359,0:20:50.670 OK. 0:20:50.800,0:20:51.030 I 0:20:51.199,0:20:55.030 have extension lines that are crossing each other and we'll see 0:20:55.359,0:20:55.969 maybe in a second, 0:20:56.000,0:20:57.599 I think there's a standard that says that that's OK, 0:20:57.680,0:20:59.109 at least I know that it's OK, 0:20:59.359,0:21:02.310 but we do not have dimension lines crossing each other. 0:21:02.520,0:21:03.199 Dimension lines, 0:21:03.280,0:21:05.800 the ones with arrows should never ever cross each other. 0:21:06.420,0:21:11.050 Nor should the ones with arrows be located on top of the part. 0:21:11.380,0:21:13.130 Here's located on top of the part. 0:21:13.380,0:21:14.170 Instead, 0:21:14.579,0:21:16.500 they need to be moved off of the part. 0:21:17.819,0:21:20.239 We also should not have dimension lines, 0:21:20.260,0:21:23.859 so this Leader Line is a Dimension Line for an arc, 0:21:24.300,0:21:26.050 and it is crossing 0:21:26.660,0:21:27.250 these, 0:21:28.339,0:21:28.450 these 0:21:28.450,0:21:29.369 extension lines, 0:21:29.380,0:21:30.770 and they should not be doing that. 0:21:31.060,0:21:32.530 How could all this be arranged? 0:21:32.790,0:21:36.050 Sometimes it's a little puzzle and you just got to do it until it works out, 0:21:36.099,0:21:40.369 and this one right over here is the one where we get that working out just right. 0:21:40.739,0:21:40.890 All right, 0:21:40.939,0:21:42.780 extension lines may cross, 0:21:43.170,0:21:44.810 but should not coincide with part lines. 0:21:44.890,0:21:46.089 This is what I was saying a minute ago, 0:21:46.130,0:21:48.569 is that the extension lines may cross each other. 0:21:49.290,0:21:49.489 Yeah, 0:21:49.569,0:21:50.640 let's see if we can find, 0:21:50.729,0:21:51.239 I 0:21:51.290,0:21:52.319 guess there's not 0:21:53.189,0:21:54.709 an awesome example of this. 0:21:55.069,0:21:55.150 We 0:21:55.150,0:21:56.660 saw that on the last one though, 0:21:57.479,0:21:59.180 but what we are seeing on this one 0:21:59.630,0:22:03.540 is that the extension line should not coincide with 0:22:03.910,0:22:04.540 the 0:22:04.910,0:22:05.630 part line. 0:22:05.949,0:22:06.199 So, 0:22:06.229,0:22:07.140 for example, 0:22:07.660,0:22:09.859 this line that's right in here, 0:22:10.050,0:22:10.670 that one, 0:22:10.829,0:22:11.390 OK, 0:22:11.790,0:22:14.420 and this one are colinear, 0:22:14.750,0:22:17.280 but they don't occupy the same space. 0:22:17.989,0:22:18.380 OK, 0:22:18.459,0:22:20.250 in this one down here, 0:22:20.579,0:22:22.369 they're occupying the same space. 0:22:22.449,0:22:24.290 They're literally on top of each other. 0:22:24.699,0:22:25.930 We do not want that to happen, 0:22:25.979,0:22:28.530 we want to have the extension line come off of the part, 0:22:28.819,0:22:29.890 not be on the part. 0:22:30.060,0:22:33.010 So, here we can see the Leader Line is on top of the Part Line. 0:22:33.060,0:22:33.810 We don't like that. 0:22:33.880,0:22:34.609 That's not 0:22:34.859,0:22:34.930 good. 0:22:34.939,0:22:35.890 It's not just we don't like it, 0:22:35.900,0:22:37.900 it's inconsistent with the standards. 0:22:38.930,0:22:40.839 Dimensions should be made to visible lines, 0:22:40.969,0:22:41.930 not hidden lines. 0:22:43.420,0:22:43.859 OK. 0:22:47.000,0:22:49.050 Here we are dimensioning what is going on here? 0:22:49.160,0:22:49.400 OK, 0:22:49.520,0:22:50.469 in this area, 0:22:51.500,0:22:54.410 we are dimensioning to actual lines that are not hidden 0:22:55.020,0:22:57.530 in these other areas that are orange, 0:22:57.859,0:22:58.459 we 0:22:58.500,0:23:00.130 are dimensioning to hidden lines, 0:23:00.140,0:23:00.890 which is 0:23:00.979,0:23:02.130 not appropriate. 0:23:02.500,0:23:03.290 It's wrong, 0:23:03.579,0:23:04.020 OK? 0:23:04.449,0:23:05.010 Now, 0:23:05.260,0:23:06.130 this one, 0:23:06.500,0:23:09.920 we are coming right down and measuring on, 0:23:10.020,0:23:10.969 we're measuring 0:23:11.300,0:23:11.969 to 0:23:11.979,0:23:13.530 the actual part lines, 0:23:13.900,0:23:14.920 but frankly, 0:23:15.020,0:23:17.030 these arrows should not be 0:23:17.380,0:23:18.300 on top of the part, 0:23:18.339,0:23:20.569 they need to be pulled off somewhere else. 0:23:21.380,0:23:21.780 It is, 0:23:21.800,0:23:22.280 however, 0:23:22.310,0:23:24.510 hard to know where we would pull them off to, 0:23:25.069,0:23:26.420 because if we pull them off, 0:23:26.750,0:23:31.459 we're gonna end up with line just underneath this one and just underneath this one, 0:23:31.829,0:23:34.420 and it's going to start to become less clear 0:23:34.869,0:23:36.979 what that dimension is pointing to. 0:23:37.430,0:23:39.579 If we have the dimension come off to here 0:23:39.790,0:23:40.579 like this, 0:23:42.260,0:23:44.739 this might be in a more appropriate place to have it, 0:23:44.859,0:23:45.369 but 0:23:45.660,0:23:47.739 we would not want to do it at the same time we're trying 0:23:47.739,0:23:50.540 to do these because that's gonna get too complicated in that space. 0:23:50.619,0:23:52.969 So, this is where we remember our original 0:23:53.270,0:23:57.209 goal which is that above all engineering drawings should be clear 0:23:57.540,0:23:59.449 and concise and correct. 0:23:59.859,0:24:01.369 And in this case, 0:24:01.739,0:24:03.250 this may be one reason 0:24:04.060,0:24:04.609 to 0:24:04.869,0:24:05.780 go with this 0:24:06.060,0:24:08.180 even though it's technically a violation. 0:24:09.839,0:24:10.040 Dimensions 0:24:10.040,0:24:13.109 should be placed in views where the feature has its true shape, 0:24:13.400,0:24:15.030 and is most clearly shown. 0:24:15.319,0:24:15.630 So, 0:24:15.640,0:24:16.500 for example, 0:24:16.839,0:24:21.510 here on the diameter of this outside circle that's right over here, 0:24:21.839,0:24:24.229 we want to dimension it where it appears as a circle. 0:24:24.439,0:24:27.770 We do not want to dimension it where it does not appear as a circle. 0:24:30.010,0:24:31.589 That's to help make it extra clear. 0:24:32.650,0:24:35.089 Angular dimensions should point to extension lines, 0:24:35.150,0:24:36.449 not to feature lines. 0:24:37.949,0:24:38.599 OK. 0:24:38.910,0:24:39.390 In other words, 0:24:39.469,0:24:40.540 it should look like this. 0:24:41.510,0:24:41.770 OK, 0:24:41.849,0:24:42.770 right up here at the top. 0:24:43.849,0:24:46.020 I've got an extension line off this face, 0:24:46.189,0:24:48.060 an extension line off of here, 0:24:48.310,0:24:49.989 and I've got a dimension in between it. 0:24:51.219,0:24:52.030 Over here, 0:24:52.180,0:24:54.229 I am pointing to part lines, 0:24:54.660,0:24:56.699 not to extension lines or in this case the 0:24:56.699,0:24:59.449 extension lines are coinciding with the part lines, 0:24:59.780,0:25:00.410 which 0:25:00.579,0:25:01.609 is not good. 0:25:03.030,0:25:06.540 Sometimes, it can be hard to know how to do this if not doing it this way, 0:25:06.869,0:25:07.709 but nevertheless, 0:25:07.750,0:25:10.040 this is a violation of the standard. 0:25:11.079,0:25:11.190 Holes 0:25:11.190,0:25:13.979 should be dimensioned in views where they appear as circles. 0:25:14.310,0:25:16.229 They should use the diameter symbol before the 0:25:16.229,0:25:19.540 dimension or the notation "DIA" after the dimension, 0:25:20.109,0:25:23.699 and the location dimension should come from the centerline of the circle. 0:25:24.829,0:25:24.839 OK, 0:25:25.979,0:25:26.380 so 0:25:26.619,0:25:27.619 this is appropriate. 0:25:28.729,0:25:29.869 This is appropriate. 0:25:32.930,0:25:33.180 OK, 0:25:33.239,0:25:34.699 these ones here are also appropriate, 0:25:34.760,0:25:36.069 even though I'm on my 0:25:36.400,0:25:37.339 no-thing, 0:25:37.640,0:25:38.040 OK. 0:25:40.569,0:25:40.675 But 0:25:40.675,0:25:42.040 what's not good here, 0:25:42.290,0:25:42.939 OK? 0:25:43.119,0:25:43.719 So, first of all, 0:25:43.810,0:25:46.560 we are dimensioning to the center of the circle, 0:25:47.290,0:25:48.239 which is good. 0:25:50.380,0:25:53.310 Here we are attempting to measure to the side of the circle, 0:25:53.660,0:25:54.670 not good. 0:25:56.130,0:25:57.239 Why do we do 0:25:57.699,0:25:57.760 that? 0:25:57.930,0:26:02.010 Largely because holes are put in with drills and the center of the drill is known, 0:26:02.130,0:26:03.680 really not the edge of the drill. 0:26:03.849,0:26:05.040 So, we want to go place 0:26:05.290,0:26:06.839 it based on the center. 0:26:07.530,0:26:07.689 All 0:26:07.570,0:26:07.689 right, 0:26:08.410,0:26:08.525 that's 0:26:08.525,0:26:09.239 that. 0:26:09.530,0:26:09.729 OK, 0:26:09.810,0:26:11.880 when there are multiple identical features, 0:26:12.250,0:26:13.849 dimension only one feature 0:26:13.910,0:26:17.290 and indicate the number of features to which the dimension applies by, 0:26:17.489,0:26:18.239 for example, 0:26:18.410,0:26:20.089 "6X" preceding the dimension. 0:26:20.770,0:26:21.000 OK, 0:26:21.030,0:26:22.770 let's go see what we got here. 0:26:23.089,0:26:23.800 OK. 0:26:24.839,0:26:24.959 Well, 0:26:25.119,0:26:25.560 first of all, 0:26:25.719,0:26:25.839 look, 0:26:25.920,0:26:26.680 I got this one, 0:26:26.719,0:26:27.589 which is good. 0:26:27.770,0:26:28.000 OK, 0:26:28.079,0:26:29.790 that refers to this, 0:26:30.599,0:26:31.420 this, 0:26:31.949,0:26:32.619 this, 0:26:33.339,0:26:34.329 and this. 0:26:35.000,0:26:35.829 But 0:26:36.119,0:26:37.790 there's some things here that are not good, 0:26:37.920,0:26:38.530 OK? 0:26:39.000,0:26:40.469 That's this one, 0:26:41.680,0:26:42.469 this one, 0:26:43.260,0:26:43.939 this one, 0:26:44.079,0:26:45.880 and look at this super messy one 0:26:46.239,0:26:47.589 right down in here, 0:26:47.920,0:26:48.060 right? 0:26:48.119,0:26:49.199 We do not want to do that. 0:26:49.280,0:26:50.989 Let's just simplify the thing 0:26:51.479,0:26:52.160 and 0:26:52.680,0:26:54.229 just go get ourselves 0:26:54.739,0:26:55.939 4X 0:26:57.520,0:26:58.609 R.1, 0:26:59.199,0:26:59.640 OK? 0:26:59.920,0:27:00.630 That's a lot better, 0:27:00.839,0:27:02.719 a lot better than what we had otherwise. 0:27:04.920,0:27:05.170 Rounds 0:27:05.170,0:27:07.550 and fillets should be dimensioned by radius, 0:27:07.760,0:27:09.339 not by length or 0:27:10.000,0:27:10.869 diameter. 0:27:11.239,0:27:11.469 So, 0:27:11.479,0:27:12.310 for example, 0:27:13.040,0:27:13.570 these 0:27:13.570,0:27:14.199 radii 0:27:15.000,0:27:18.609 are all shown as R.13, that means it's a radius. 0:27:18.959,0:27:19.510 We do 0:27:19.719,0:27:21.030 not do this. 0:27:21.819,0:27:26.930 We only dimension with diameter symbol when it is a full circle. 0:27:27.260,0:27:29.290 When is an arc or something else, 0:27:29.939,0:27:30.069 it 0:27:29.069,0:27:31.650 is dimensioned with a radius. 0:27:31.859,0:27:32.989 This is the standard. 0:27:34.260,0:27:34.760 OK. 0:27:35.000,0:27:36.040 What are we looking at now? 0:27:36.119,0:27:36.239 Oh, 0:27:36.280,0:27:37.150 this is the same thing, 0:27:37.359,0:27:37.479 right? 0:27:37.560,0:27:39.410 We do not try to dimension 0:27:39.680,0:27:40.729 radii 0:27:41.160,0:27:41.839 with 0:27:42.780,0:27:44.339 linear dimensions. 0:27:45.329,0:27:46.829 We use an arc command, 0:27:46.869,0:27:47.030 you know, 0:27:47.109,0:27:48.060 like a radius command. 0:27:48.229,0:27:48.349 All right, 0:27:48.430,0:27:49.189 in dimensions, 0:27:49.390,0:27:49.699 excuse me, 0:27:49.880,0:27:50.670 chamfers may 0:27:50.869,0:27:54.359 be dimensioned by horizontal and vertical distances, 0:27:55.150,0:27:55.210 or 0:27:55.210,0:27:57.640 by horizontal dimension and an angle. 0:27:58.719,0:27:58.989 All right, 0:27:59.109,0:28:01.699 see if we got an example of that on here anywhere. 0:28:02.189,0:28:02.430 OK, 0:28:02.589,0:28:03.589 so here's one, 0:28:03.630,0:28:03.829 OK, 0:28:03.949,0:28:04.900 right up here. 0:28:05.229,0:28:06.339 That's acceptable. 0:28:07.680,0:28:08.829 This is acceptable, 0:28:08.839,0:28:09.400 and this 0:28:09.420,0:28:12.709 one I'm circling right now is the most common way to do it. 0:28:13.550,0:28:13.680 OK, 0:28:13.719,0:28:14.829 a horizontal dimension, 0:28:14.959,0:28:16.170 so this dimension, 0:28:17.199,0:28:18.540 plus the angle. 0:28:21.219,0:28:21.410 Use 0:28:21.410,0:28:26.170 the proper number of significant digits for the desired implicit tolerance. 0:28:26.579,0:28:27.520 This is 0:28:27.709,0:28:31.089 really important and something that many of you will overlook 0:28:31.500,0:28:33.890 if you're not careful about it and thinking about it. 0:28:34.760,0:28:35.290 OK, 0:28:35.449,0:28:36.079 so, 0:28:36.369,0:28:37.969 take a look at what we have going on right here, 0:28:38.050,0:28:39.689 which is the length of this clamp, 0:28:40.130,0:28:41.920 the length of the bar of this clamp. 0:28:42.290,0:28:42.449 OK, 0:28:42.530,0:28:45.359 it is listed as 10.2 inches. 0:28:46.469,0:28:46.900 Now, 0:28:47.069,0:28:49.859 there is a tolerance associated with this, 0:28:50.109,0:28:53.349 and it comes straight from the title block tolerance, 0:28:53.609,0:28:53.800 OK, 0:28:53.829,0:28:55.400 which we find right down here, 0:28:55.750,0:28:59.459 and we can see that when we are one decimal spot in, 0:29:00.709,0:29:03.849 then it is going to be plus or minus 20,000 of an inch. 0:29:05.020,0:29:05.359 OK, 0:29:05.479,0:29:07.310 so this over here is plus, 0:29:08.239,0:29:08.949 minus, 0:29:09.520,0:29:11.400 I don't know why I'm trying to write this, 0:29:11.800,0:29:14.989 0.02 inches. 0:29:15.880,0:29:16.729 That's horrible. 0:29:16.869,0:29:19.459 It's really hard to do that with my trackpad. 0:29:20.750,0:29:20.989 All right, 0:29:21.109,0:29:22.380 that just looks so stupid. 0:29:22.479,0:29:22.979 Anyway, 0:29:23.229,0:29:23.680 that 0:29:23.949,0:29:26.109 is telling us the tolerance of that. 0:29:26.229,0:29:26.390 Now, 0:29:26.439,0:29:27.939 the default tolerance 0:29:28.270,0:29:29.459 for solid works 0:29:29.829,0:29:30.579 is this number. 0:29:30.609,0:29:31.130 It is, 0:29:31.140,0:29:31.550 excuse me, 0:29:31.670,0:29:32.819 2 decimal 0:29:33.430,0:29:33.939 spots, 0:29:33.989,0:29:35.939 2 digits past the decimal spot. 0:29:36.109,0:29:36.219 So, 0:29:36.229,0:29:38.819 this would mean if we were to leave it that way, 0:29:39.229,0:29:40.219 that we need 0:29:40.430,0:29:42.829 this to be plus or minus 10,000 of an inch. 0:29:43.540,0:29:46.540 And so, you need to go in and you need to adjust 0:29:47.270,0:29:50.550 the number of significant digits for 0:29:50.829,0:29:52.199 the tolerance that you need. 0:29:53.160,0:29:53.439 All right, 0:29:53.540,0:29:55.040 that is all we're gonna go over today. 0:29:55.119,0:29:56.469 That's been 30 minutes, 0:29:56.839,0:29:58.550 and those are the 0:29:59.000,0:30:00.189 drawing standards. 0:30:00.459,0:30:02.310 You're gonna need to stick with them 0:30:02.560,0:30:03.310 and 0:30:03.680,0:30:04.800 you're gonna need to understand them, 0:30:04.810,0:30:06.880 and I've just given you a bunch of yes/noes, 0:30:06.959,0:30:07.479 yes/noes, 0:30:07.599,0:30:09.869 yes noes to try to help you visualize 0:30:10.319,0:30:12.560 the difference between it being done right 0:30:12.920,0:30:14.319 and it not being done right. 0:30:14.439,0:30:14.989 OK. 0:30:15.479,0:30:16.189 Good luck. 0:30:16.520,0:30:20.109 Tie this to what you're reading in Section 5.7 0:30:20.280,0:30:21.349 of the guidebook. 0:30:21.810,0:30:22.099 You 0:30:22.140,0:30:22.619 do this, 0:30:22.699,0:30:25.969 you spend some time now learning it and it will stick with you, 0:30:26.339,0:30:28.099 and it's gonna serve you well as you 0:30:28.099,0:30:30.819 work all the engineering drawings for all the projects 0:30:31.099,0:30:32.260 that will be turned in for this class. 0:30:32.349,0:30:32.729 OK, 0:30:32.900,0:30:33.630 thanks everyone.