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