1 00:00:00,200 --> 00:00:02,200 As you work to develop CAD fluency, 2 00:00:02,279 --> 00:00:05,550 which means to be able to do your CAD work quickly and accurately, 3 00:00:05,800 --> 00:00:08,949 it helps to have a good CAD process. 4 00:00:09,210 --> 00:00:13,189 Now, a good CAD process always starts with understanding 5 00:00:13,470 --> 00:00:15,229 the purpose for the CAD work. 6 00:00:15,399 --> 00:00:15,920 In other words, 7 00:00:16,350 --> 00:00:18,309 understanding the job that needs to be done. 8 00:00:18,600 --> 00:00:20,350 Now in the product development process, 9 00:00:20,639 --> 00:00:24,200 we have a variety of ways that we understand the job that needs to be done. 10 00:00:24,319 --> 00:00:24,750 For example, 11 00:00:24,799 --> 00:00:25,200 we might 12 00:00:25,649 --> 00:00:25,850 read 13 00:00:25,889 --> 00:00:30,319 a design brief or have a discussion with a client or anything like that. 14 00:00:30,690 --> 00:00:36,529 But in the process of learning CAD and being given exercises and 15 00:00:36,849 --> 00:00:39,319 activities the way we're doing in this course, 16 00:00:39,729 --> 00:00:43,500 one of the important ways for you to understand the job that needs to be done 17 00:00:43,889 --> 00:00:44,439 is 18 00:00:44,689 --> 00:00:46,279 to be able to read 19 00:00:46,569 --> 00:00:49,529 and interpret correctly an engineering drawing. 20 00:00:50,150 --> 00:00:50,950 Usually, 21 00:00:51,270 --> 00:00:54,619 in this course, for the purpose of reproducing the geometry 22 00:00:55,029 --> 00:00:55,540 found 23 00:00:55,790 --> 00:00:57,459 in those engineering drawings. 24 00:00:57,590 --> 00:00:58,659 So, in this video, 25 00:00:58,909 --> 00:01:02,779 I'll take the time to describe to you part drawings 26 00:01:03,060 --> 00:01:04,430 and assembly drawings. 27 00:01:04,529 --> 00:01:05,800 And I will simply 28 00:01:06,349 --> 00:01:06,849 attempt 29 00:01:07,110 --> 00:01:10,339 to demystify what otherwise may appear 30 00:01:10,669 --> 00:01:13,019 like a complicated set of documents. 31 00:01:13,110 --> 00:01:16,110 But as soon as you sort of break them down and see what's in them, 32 00:01:16,470 --> 00:01:21,540 you'll be able to begin the process of reading and interpreting them correctly. 33 00:01:21,750 --> 00:01:24,349 So, I'm gonna jump right now into a set of graphics. 34 00:01:24,430 --> 00:01:27,269 We're gonna take a look at these graphics now, and we can see 35 00:01:28,410 --> 00:01:29,309 there is a product here. 36 00:01:29,370 --> 00:01:30,760 It is a turbocharger. 37 00:01:31,089 --> 00:01:33,750 This particular turbocharger for the discussion 38 00:01:34,010 --> 00:01:38,059 that we're gonna have right now has two pages 39 00:01:38,290 --> 00:01:39,000 of a drawing. 40 00:01:39,169 --> 00:01:40,959 So, the drawing is shown right here. 41 00:01:41,169 --> 00:01:42,800 We're gonna look at sheet 1 42 00:01:43,089 --> 00:01:44,319 of this drawing set, 43 00:01:44,569 --> 00:01:45,940 and we're just gonna start 44 00:01:46,330 --> 00:01:48,440 breaking down its pieces, 45 00:01:48,809 --> 00:01:51,209 and then we'll look at sheet 2, and then we're gonna 46 00:01:51,209 --> 00:01:54,610 spend a little bit of time looking at an assembly drawing. 47 00:01:55,339 --> 00:01:55,349 OK. 48 00:01:56,290 --> 00:01:57,319 For sheet 1, 49 00:01:57,769 --> 00:02:01,809 we need to understand that the overall graphic that's 50 00:02:01,809 --> 00:02:04,120 around the edge is called the sheet format. 51 00:02:04,330 --> 00:02:04,680 In fact, 52 00:02:04,730 --> 00:02:05,180 we can 53 00:02:05,370 --> 00:02:08,440 just sort of take out all the geometry and specific 54 00:02:08,809 --> 00:02:12,809 geometric information and what's left is called the sheet format. 55 00:02:13,470 --> 00:02:14,059 All right. 56 00:02:14,190 --> 00:02:16,419 The sheet format has zone markers. 57 00:02:16,630 --> 00:02:20,259 These zone markers are used for to facilitate communication 58 00:02:20,550 --> 00:02:24,220 on design teams or across a large geographic distances. 59 00:02:24,229 --> 00:02:24,740 We can say, 60 00:02:24,750 --> 00:02:25,039 hey, 61 00:02:25,309 --> 00:02:29,070 something's going on in C2, area C2, of the drawing. 62 00:02:29,110 --> 00:02:30,940 Let's take a look and see what that is. 63 00:02:32,470 --> 00:02:34,259 Also, in 64 00:02:34,619 --> 00:02:35,309 the 65 00:02:35,630 --> 00:02:38,539 drawing we have the thing that is called the revision block. 66 00:02:38,669 --> 00:02:41,229 The revision block describes the latest change at 67 00:02:41,229 --> 00:02:42,869 least that has been made to the drawing. 68 00:02:42,949 --> 00:02:43,740 In this case, 69 00:02:44,070 --> 00:02:45,220 it's a revision A, 70 00:02:45,270 --> 00:02:47,539 meaning it's just the initial release. 71 00:02:47,990 --> 00:02:50,740 The revision block only appears on sheet 1. 72 00:02:51,509 --> 00:02:55,539 We also have the thing on the drawing that's called the title block. 73 00:02:55,669 --> 00:02:56,630 The title block 74 00:02:56,880 --> 00:02:59,389 has a lot of very important information. 75 00:02:59,630 --> 00:03:02,020 And within the title block, we find things that 76 00:03:02,020 --> 00:03:05,250 are critical for being able to reproduce the geometry 77 00:03:05,619 --> 00:03:06,479 that's in 78 00:03:06,940 --> 00:03:10,149 the drawing. And so, we're gonna take a deeper look now at the title block, 79 00:03:10,419 --> 00:03:13,380 and we're gonna look at three separate parts of the title block. 80 00:03:13,500 --> 00:03:17,649 First, we're gonna take a look at this part here, which, of course, has like the title, 81 00:03:17,940 --> 00:03:19,610 also has a thing called 82 00:03:19,850 --> 00:03:23,979 the size, and, by the way, we are looking at B size drawings. 83 00:03:24,020 --> 00:03:26,490 These are 11 by 17 84 00:03:27,309 --> 00:03:28,029 inches. 85 00:03:28,149 --> 00:03:29,899 That's how big those drawings are. 86 00:03:30,149 --> 00:03:32,759 Now, a couple of key things to pay attention to here. 87 00:03:33,080 --> 00:03:35,830 Item number 1 is you should always have a sense 88 00:03:35,830 --> 00:03:38,699 for what revision of the drawing you're looking at. 89 00:03:38,990 --> 00:03:40,990 This is important because occasionally you'll 90 00:03:40,990 --> 00:03:43,179 be working with a colleague or another 91 00:03:43,589 --> 00:03:44,990 entity, 92 00:03:45,130 --> 00:03:47,259 maybe a supplier or something like this, 93 00:03:47,470 --> 00:03:50,309 and you want to make sure that you're on the same page. And the 94 00:03:50,309 --> 00:03:53,300 way we do that is you make sure you're looking at the same revision 95 00:03:53,589 --> 00:03:54,350 of the drawing. 96 00:03:54,899 --> 00:03:56,039 Speaking of pages, 97 00:03:56,380 --> 00:03:58,130 which is not what I meant just a minute ago, 98 00:03:58,419 --> 00:03:59,369 there 99 00:03:59,539 --> 00:04:00,130 are 100 00:04:00,380 --> 00:04:02,330 multiple sheets in this drawing set, 101 00:04:02,380 --> 00:04:04,740 and there's always a list of how many sheets there are. 102 00:04:04,820 --> 00:04:07,660 That's important to know because if there's additional information on 103 00:04:07,660 --> 00:04:10,220 sheet 2 or 3 or 4 or 5 or 6, 104 00:04:10,259 --> 00:04:11,889 we want to go and get them. 105 00:04:12,539 --> 00:04:13,770 Also, we have 106 00:04:14,389 --> 00:04:16,209 information that is 107 00:04:16,399 --> 00:04:18,329 related to the overall 108 00:04:19,390 --> 00:04:24,170 mass properties of the object represented in the drawing. In this case, the weight 109 00:04:24,540 --> 00:04:29,010 is shown, and then also here to pay attention to is the scale. 110 00:04:29,260 --> 00:04:33,929 The scale is important to understand in the sense that if the scale was 1 to 1, 111 00:04:34,260 --> 00:04:38,450 then the object in the drawing would be printed 112 00:04:38,700 --> 00:04:41,820 on the drawing at the same size as the actual object. 113 00:04:42,279 --> 00:04:43,790 When the scale is 1 to 5, 114 00:04:43,920 --> 00:04:44,429 in this case, 115 00:04:44,480 --> 00:04:48,119 every 1 inch that's printed on the drawing represents 5 inches 116 00:04:48,519 --> 00:04:48,910 in 117 00:04:49,119 --> 00:04:49,989 reality. 118 00:04:50,279 --> 00:04:50,429 All right. 119 00:04:50,440 --> 00:04:54,399 The next part of the title block that we're gonna take a look at captures authorship. 120 00:04:54,679 --> 00:04:58,429 And also, thedrawing has been checked, and frankly, you should 121 00:04:58,920 --> 00:05:01,239 always have your drawings checked. And you should not 122 00:05:01,239 --> 00:05:03,359 trust drawings that have not yet been checked. 123 00:05:04,000 --> 00:05:07,029 Also, in this part of the drawing, we find the units 124 00:05:07,359 --> 00:05:07,950 for 125 00:05:08,209 --> 00:05:09,799 how the drawing was created. 126 00:05:09,839 --> 00:05:12,880 In this case, this drawing is in the units of millimeters. 127 00:05:13,480 --> 00:05:15,149 We also find the important 128 00:05:15,649 --> 00:05:21,200 area that is describing the material of the object represented in the drawing. 129 00:05:21,209 --> 00:05:21,869 In this case, 130 00:05:22,010 --> 00:05:25,399 the turbocharger in the drawing is of titanium grade 5. 131 00:05:25,970 --> 00:05:28,329 Also, in the drawing, we can find 132 00:05:28,540 --> 00:05:30,579 finish if there is one specified and if there's 133 00:05:30,579 --> 00:05:32,450 not one specified, it will simply say that. 134 00:05:32,459 --> 00:05:32,940 And then, 135 00:05:33,220 --> 00:05:36,049 also, here there's a section for comments. And in this course, 136 00:05:36,339 --> 00:05:39,109 this is where we actually put our color specifications. 137 00:05:39,649 --> 00:05:39,709 This 138 00:05:39,739 --> 00:05:43,019 is not a color specification for the turbocharger. 139 00:05:43,059 --> 00:05:44,769 This would have meant the turbocharger was 140 00:05:45,220 --> 00:05:46,459 perfectly red. 141 00:05:47,010 --> 00:05:47,380 But 142 00:05:47,450 --> 00:05:50,010 I have just put that in there as a quick sample just 143 00:05:50,010 --> 00:05:53,920 to show you that those will often show up in our comments. 144 00:05:54,089 --> 00:05:56,769 We also then have this other part of the title block, 145 00:05:57,089 --> 00:05:59,420 which is the sheet tolerances. 146 00:05:59,579 --> 00:06:01,450 Now, what's going on with sheet tolerances? 147 00:06:01,529 --> 00:06:01,820 First of all, 148 00:06:01,850 --> 00:06:03,839 we have to know that this part represents 149 00:06:04,209 --> 00:06:07,809 important information relative to the dimensions in the drawing. 150 00:06:08,850 --> 00:06:10,929 So, we're going to go look at one of the dimensions right now. 151 00:06:11,000 --> 00:06:11,549 From the 152 00:06:11,799 --> 00:06:14,829 top edge of this object to the center of this hole 153 00:06:15,119 --> 00:06:19,079 is supposed to be 23.00 millimeters. 154 00:06:19,679 --> 00:06:24,790 Now, we can understand from this part of the drawing and from the sheet tolerances 155 00:06:25,109 --> 00:06:26,429 that what this means 156 00:06:26,799 --> 00:06:28,010 is that because our 157 00:06:28,625 --> 00:06:29,494 has two 158 00:06:32,144 --> 00:06:34,494 bits of information beyond the decimal point, 159 00:06:34,785 --> 00:06:36,575 then we will be referring to 160 00:06:36,904 --> 00:06:39,135 this portion in the general 161 00:06:39,785 --> 00:06:40,464 tolerances, 162 00:06:40,505 --> 00:06:41,695 the sheet tolerances, 163 00:06:41,984 --> 00:06:44,355 which mean that the 23 164 00:06:44,665 --> 00:06:47,475 is plus or minus 0.15 millimeters. 165 00:06:48,184 --> 00:06:48,575 Now, 166 00:06:48,864 --> 00:06:51,945 if our drawing would have instead just had one 167 00:06:52,329 --> 00:06:55,190 bit of information beyond the decimal spot, 168 00:06:55,359 --> 00:06:59,170 we would have been looking at plus or minus 0.25 millimeters. 169 00:06:59,559 --> 00:07:03,070 Now, this is important because all of those tolerances are essential, 170 00:07:03,359 --> 00:07:04,579 but we don't want to put them, 171 00:07:04,720 --> 00:07:07,350 every single one of them on the drawing itself 172 00:07:07,880 --> 00:07:09,029 because it will 173 00:07:09,609 --> 00:07:10,649 clutter up the drawings. 174 00:07:10,679 --> 00:07:12,200 So, they go into the sheet 175 00:07:12,750 --> 00:07:15,320 definition, so into the sheet tolerances. 176 00:07:15,630 --> 00:07:17,309 That's what that means. 177 00:07:17,429 --> 00:07:17,859 OK. 178 00:07:18,029 --> 00:07:21,190 Well, those were the main things that we wanted to look at in the 179 00:07:21,190 --> 00:07:24,959 title block. We have finished our sort of deep dive on the title block. 180 00:07:25,230 --> 00:07:28,670 And then, I'll just go through a few other things here and say that 181 00:07:29,029 --> 00:07:31,019 drawings always have 182 00:07:31,309 --> 00:07:33,390 a set of general drawing notes. 183 00:07:33,429 --> 00:07:36,549 These drawing notes apply to the entire drawing 184 00:07:37,010 --> 00:07:37,410 set, 185 00:07:37,779 --> 00:07:39,299 sometimes just the entire page, 186 00:07:39,350 --> 00:07:42,279 but sometimes it can apply to all the sheets. 187 00:07:42,450 --> 00:07:46,440 But then we also have specific notes that can apply to just a specific 188 00:07:46,809 --> 00:07:51,100 part located or a specific portion of a part located on the drawing, 189 00:07:51,130 --> 00:07:52,760 and there's always a leader line 190 00:07:53,010 --> 00:07:55,730 that is connected to where that note matters. 191 00:07:56,529 --> 00:07:56,549 All right. 192 00:07:57,519 --> 00:07:59,739 Now, we have to look at the geometry 193 00:08:00,040 --> 00:08:05,190 of the drawing. Here, we have what's called the orthographic projections, 194 00:08:05,399 --> 00:08:08,119 the orthographic projection views we could call them. 195 00:08:08,200 --> 00:08:08,670 OK. 196 00:08:08,880 --> 00:08:09,390 And then, 197 00:08:09,519 --> 00:08:10,869 we also have 198 00:08:11,279 --> 00:08:15,839 within those orthographic projection views, a special kind of line that we don't 199 00:08:15,839 --> 00:08:19,480 see anywhere else and that is a dashed line and that dashed line 200 00:08:19,614 --> 00:08:22,084 is called a hidden line. And a hidden line is 201 00:08:22,084 --> 00:08:25,394 like an X-ray view we basically can see into the object 202 00:08:25,725 --> 00:08:27,725 and what all the dashed line 203 00:08:27,725 --> 00:08:30,994 are representing internal geometry 204 00:08:31,244 --> 00:08:33,275 that we can't see from outside but we 205 00:08:33,604 --> 00:08:36,354 can see through in an X-ray sort of form. 206 00:08:36,683 --> 00:08:38,715 Now, there is another image 207 00:08:39,005 --> 00:08:42,525 on here, another view, it's called the isometric view it's the one at the top 208 00:08:43,169 --> 00:08:46,440 right of the drawing, and the top right drawing 209 00:08:46,710 --> 00:08:50,320 view the isometric view never has hidden lines. 210 00:08:50,539 --> 00:08:50,780 This 211 00:08:50,789 --> 00:08:55,380 is a standard for drawing so we can always see the isometric view 212 00:08:55,590 --> 00:08:59,229 and we can have a sense for what the object is that's to help us with that, 213 00:08:59,309 --> 00:09:01,830 but it's not gonna show us hidden lines. 214 00:09:01,950 --> 00:09:02,989 Now, it's worth spending 215 00:09:03,565 --> 00:09:03,924 just 216 00:09:03,934 --> 00:09:06,005 a little bit of time trying 217 00:09:06,005 --> 00:09:09,405 to understand what is this orthographic projection. 218 00:09:09,645 --> 00:09:12,994 If you understand the thing that I'm going to describe in the next moment, 219 00:09:13,244 --> 00:09:16,395 then orthographic projections will become meaningful to you, 220 00:09:16,604 --> 00:09:17,364 will become useful, 221 00:09:17,375 --> 00:09:19,734 and you'll be able to understand engineering drawings 222 00:09:20,085 --> 00:09:20,474 of 223 00:09:20,565 --> 00:09:23,354 this form indefinitely into the future. 224 00:09:23,575 --> 00:09:26,794 So, I'm gonna show you the same orthographic projections 225 00:09:27,205 --> 00:09:27,965 shown 226 00:09:28,700 --> 00:09:31,080 in just a little bit larger here, 227 00:09:31,369 --> 00:09:34,799 and what we want to do is take a look at the front view for a second. 228 00:09:35,010 --> 00:09:36,700 When we're looking at the front view, 229 00:09:37,090 --> 00:09:37,440 what 230 00:09:37,489 --> 00:09:39,159 we are really looking at 231 00:09:39,500 --> 00:09:40,359 is 232 00:09:40,369 --> 00:09:41,000 a 233 00:09:41,369 --> 00:09:42,880 projection 234 00:09:43,409 --> 00:09:46,919 of the object directly onto its front face. 235 00:09:47,289 --> 00:09:47,719 Now, 236 00:09:48,169 --> 00:09:52,640 if you can see the red box that's on the right-hand side here, 237 00:09:53,130 --> 00:09:55,929 the front view is exactly the front view direction. 238 00:09:56,780 --> 00:09:56,969 Now, 239 00:09:57,000 --> 00:09:58,030 if I were to 240 00:09:58,520 --> 00:10:00,320 take a line 241 00:10:00,960 --> 00:10:04,770 and draw it on the paper between the top view and the front view 242 00:10:05,119 --> 00:10:08,510 and then fold it right there at 90 degrees, 243 00:10:08,719 --> 00:10:10,390 I would create the edge of a cube. 244 00:10:11,020 --> 00:10:13,210 And the edge of that cube would be such that when I 245 00:10:13,210 --> 00:10:16,359 look down from the top of the cube, I see the top view, 246 00:10:16,650 --> 00:10:19,260 and when I look at the front of the cube, I see the front view. 247 00:10:19,530 --> 00:10:20,250 Now, likewise, 248 00:10:20,369 --> 00:10:23,090 if I were to fold between the front view and 249 00:10:23,090 --> 00:10:25,789 the right view and leave the paper at 90 degrees, 250 00:10:25,809 --> 00:10:27,200 I'd form another 251 00:10:27,570 --> 00:10:28,849 edge of a cube. 252 00:10:29,590 --> 00:10:32,099 And when I look at the right side of that cube, I would 253 00:10:32,099 --> 00:10:34,299 see the right view, and when I look at the front view, 254 00:10:34,419 --> 00:10:36,380 I would see the front view, and if I look at the top view, 255 00:10:36,460 --> 00:10:37,549 I'd see the top view. 256 00:10:37,739 --> 00:10:41,679 And this is how an orthographic projection works. 257 00:10:41,820 --> 00:10:42,969 It's simple 258 00:10:43,739 --> 00:10:45,280 when someone has described it to you, 259 00:10:45,349 --> 00:10:46,570 but is otherwise, 260 00:10:48,109 --> 00:10:48,789 for some people, 261 00:10:48,830 --> 00:10:51,270 not super obvious. So, hopefully, you will walk 262 00:10:51,270 --> 00:10:53,330 away with a little bit of information there 263 00:10:53,590 --> 00:10:54,940 on how to interpret 264 00:10:55,229 --> 00:10:55,700 these 265 00:10:55,989 --> 00:10:57,820 orthographic projections. 266 00:10:58,109 --> 00:11:01,859 So, now, you should be able to look at an engineering drawing like this 267 00:11:02,150 --> 00:11:04,789 and not get super overwhelmed by it because 268 00:11:04,789 --> 00:11:06,979 you know that all the information around the edge 269 00:11:07,429 --> 00:11:08,809 is the sheet format. 270 00:11:09,030 --> 00:11:11,390 You know that down in the bottom right corner, we 271 00:11:11,390 --> 00:11:14,299 have our title block with a bunch of essential information. 272 00:11:14,510 --> 00:11:16,429 We have our revision block at the top right. 273 00:11:16,880 --> 00:11:19,080 Then, we have two kinds of views here. 274 00:11:19,159 --> 00:11:22,400 We have the orthographic projections, which have the front, 275 00:11:22,599 --> 00:11:22,789 right, 276 00:11:22,799 --> 00:11:25,669 and top view, and then we have the isometric view, 277 00:11:26,000 --> 00:11:30,869 which is shown without hidden lines in the top right portion of the drawing 278 00:11:31,080 --> 00:11:32,289 and helps us get 279 00:11:32,440 --> 00:11:35,250 even a better sense for what the object is all about. 280 00:11:36,289 --> 00:11:36,869 OK. 281 00:11:37,169 --> 00:11:39,159 That was what sheet 1 looked like. 282 00:11:39,530 --> 00:11:40,000 Now, 283 00:11:40,270 --> 00:11:41,130 in sheet 1, 284 00:11:41,229 --> 00:11:43,119 we saw those orthographic projections; 285 00:11:43,210 --> 00:11:45,080 we saw the isometric view. 286 00:11:46,159 --> 00:11:47,880 And in sheet 2, 287 00:11:48,039 --> 00:11:50,039 we see what is called auxiliary views. 288 00:11:50,119 --> 00:11:50,239 Now, 289 00:11:50,250 --> 00:11:52,270 auxiliary views are not limited to 290 00:11:52,599 --> 00:11:53,640 being on page 2, 291 00:11:53,719 --> 00:11:55,119 they could be on page 1. 292 00:11:55,830 --> 00:11:57,080 But in this case, 293 00:11:57,320 --> 00:11:58,669 in this particular drawing, 294 00:11:58,960 --> 00:12:01,789 our auxiliary views happen to be on sheet 2. 295 00:12:02,000 --> 00:12:04,510 They could have been on sheet 3, 4, 5, 6, 296 00:12:04,679 --> 00:12:05,309 or 1. 297 00:12:05,559 --> 00:12:06,000 OK. 298 00:12:06,780 --> 00:12:08,700 Now in order to understand the auxiliary views, 299 00:12:08,780 --> 00:12:09,520 we need to 300 00:12:09,859 --> 00:12:11,210 zoom in just a bit 301 00:12:11,500 --> 00:12:13,659 on this portion of sheet 1 302 00:12:14,059 --> 00:12:15,700 and see what's going on here. 303 00:12:16,020 --> 00:12:18,210 Within this set portion, 304 00:12:18,380 --> 00:12:20,770 when we're looking at the front view from sheet 1, 305 00:12:21,020 --> 00:12:24,289 we see this dashed line with the two arrows on it. 306 00:12:24,609 --> 00:12:26,530 This is called a section marker, 307 00:12:26,700 --> 00:12:30,530 and what a section marker means is that we are going to slice the part 308 00:12:30,830 --> 00:12:32,739 right where the dashed line is, and then we're going 309 00:12:32,739 --> 00:12:36,460 to look in the directions of the arrows labeled AA. 310 00:12:36,750 --> 00:12:38,340 And what are we gonna see if we do that? 311 00:12:38,380 --> 00:12:39,250 We're gonna see 312 00:12:39,460 --> 00:12:40,809 this box that's now 313 00:12:41,099 --> 00:12:42,739 highlighted on sheet 2. 314 00:12:43,059 --> 00:12:45,010 How do we know that that's the box we're gonna see? 315 00:12:45,140 --> 00:12:45,260 Well, 316 00:12:45,390 --> 00:12:47,770 primarily, we know it's the box we're gonna see because 317 00:12:47,969 --> 00:12:48,809 it's labeled. 318 00:12:49,020 --> 00:12:53,179 It's called section AA, and that's exactly what we were looking at 319 00:12:53,179 --> 00:12:57,820 in sheet 1 was a marker showing what section AA would be. 320 00:12:58,140 --> 00:12:59,239 And now on sheet 2, 321 00:12:59,280 --> 00:12:59,880 we're looking at that. 322 00:12:59,960 --> 00:13:00,609 So, we're going to 323 00:13:00,840 --> 00:13:03,510 go take a look even deeper now at sheet 2. 324 00:13:03,760 --> 00:13:05,640 Now that we know that we're looking at 2 325 00:13:06,030 --> 00:13:07,159 section views, 326 00:13:07,280 --> 00:13:09,280 section views are auxiliary views. 327 00:13:10,080 --> 00:13:10,400 Alright, 328 00:13:10,520 --> 00:13:12,669 now a few things to point out on this sheet. 329 00:13:13,000 --> 00:13:13,669 We have 330 00:13:14,229 --> 00:13:17,229 the name of the auxiliary view with its scale, 331 00:13:17,400 --> 00:13:19,869 if it has been scaled, and this one has been scaled. 332 00:13:20,710 --> 00:13:21,869 We also see that 333 00:13:22,109 --> 00:13:25,049 there's a new kind of line that's appearing on the drawing, 334 00:13:25,070 --> 00:13:26,460 and this is the crosshatch. 335 00:13:26,669 --> 00:13:27,909 Whenever there's a crosshatch, 336 00:13:27,989 --> 00:13:30,419 this means that we have sliced through material 337 00:13:30,630 --> 00:13:33,979 and we're actually looking at material and not void space. 338 00:13:34,229 --> 00:13:34,859 So, for example, 339 00:13:34,909 --> 00:13:37,739 if we look at the holes that are on the same view, 340 00:13:38,030 --> 00:13:39,950 those holes are not crosshatched, that means 341 00:13:39,950 --> 00:13:42,299 they're void space. It means there's nothing there, 342 00:13:42,590 --> 00:13:46,309 but the crosshatch means there is something there and that's material. 343 00:13:46,830 --> 00:13:47,070 All right. 344 00:13:47,190 --> 00:13:48,820 What is the next piece we're gonna look at? 345 00:13:48,950 --> 00:13:53,059 We're gonna notice here that there are center lines and center marks. 346 00:13:53,429 --> 00:13:54,859 These pieces of 347 00:13:55,929 --> 00:13:57,809 sort of invisible geometry, 348 00:13:57,869 --> 00:13:59,059 maybe we can call them, 349 00:13:59,309 --> 00:14:01,750 are important for dimensioning too 350 00:14:02,330 --> 00:14:05,349 or understanding symmetries in some cases. 351 00:14:05,809 --> 00:14:06,049 All right. 352 00:14:06,169 --> 00:14:09,679 We also have in this sheet 2 dimensions, 353 00:14:10,000 --> 00:14:10,969 such as this dimension, 354 00:14:11,010 --> 00:14:16,210 which means that the overall length of this object is 268 millimeters. 355 00:14:16,729 --> 00:14:18,770 We also see some other dimensions, 356 00:14:18,929 --> 00:14:21,520 some that appear a little bit more complicated. 357 00:14:21,770 --> 00:14:23,590 And what this dimension means, 358 00:14:24,010 --> 00:14:25,239 the dimension that says 359 00:14:25,570 --> 00:14:28,960 4X R20.00 360 00:14:29,369 --> 00:14:29,859 means 361 00:14:30,130 --> 00:14:33,890 that there are four arcs on this part that have a radius 362 00:14:34,369 --> 00:14:35,419 of 20 millimeters. 363 00:14:36,010 --> 00:14:37,520 And then, likewise, 364 00:14:37,849 --> 00:14:39,700 there is a dimension here that says 365 00:14:40,049 --> 00:14:44,080 there are four circles on this part that have a diameter 366 00:14:44,369 --> 00:14:46,630 of 20 millimeters. So, when there's an R, 367 00:14:47,010 --> 00:14:49,039 this is a dimension that goes on an arc 368 00:14:49,409 --> 00:14:55,090 or an incomplete circle when there is the diameter symbol or the letters DIA. 369 00:14:55,640 --> 00:14:59,989 This means that this is a diameter and we do that for full circles. 370 00:15:00,200 --> 00:15:03,549 The 4X that precedes it in this case simply means that 371 00:15:03,799 --> 00:15:04,750 there are four 372 00:15:04,919 --> 00:15:07,669 identical geometries on this part 373 00:15:07,919 --> 00:15:09,190 that have that same 374 00:15:09,440 --> 00:15:10,049 dimension. 375 00:15:11,099 --> 00:15:14,940 Now, of course, on this drawing, there are many dimensions. That is the purpose 376 00:15:15,190 --> 00:15:19,580 of the drawing is actually to convey geometric information. 377 00:15:19,989 --> 00:15:24,080 And don't forget the rectangular red box there in the title block 378 00:15:24,270 --> 00:15:26,520 the drawing is also designed to convey 379 00:15:27,109 --> 00:15:28,190 material information. 380 00:15:28,679 --> 00:15:28,919 All right. 381 00:15:29,080 --> 00:15:30,880 So, we have just taken a look at 382 00:15:31,289 --> 00:15:32,080 part drawings. 383 00:15:32,119 --> 00:15:32,630 In this case, 384 00:15:32,679 --> 00:15:35,409 a multi-sheet part drawing for this turbocharger. 385 00:15:35,719 --> 00:15:36,590 And hopefully, 386 00:15:36,840 --> 00:15:37,320 we have, 387 00:15:37,440 --> 00:15:38,400 as I mentioned before, 388 00:15:38,599 --> 00:15:40,229 demystified it a little bit 389 00:15:40,479 --> 00:15:41,450 and shown 390 00:15:41,840 --> 00:15:43,599 that it is full of 391 00:15:44,609 --> 00:15:46,640 orthographic projection views, 392 00:15:47,000 --> 00:15:48,450 isometric views, 393 00:15:48,679 --> 00:15:50,229 and some auxiliary views, 394 00:15:50,520 --> 00:15:54,510 and then those allow dimensions to be put onto 395 00:15:54,869 --> 00:15:58,239 the object that help us understand more and more about it. 396 00:15:58,700 --> 00:15:59,380 OK. 397 00:15:59,549 --> 00:16:03,020 It is now time for us to stop thinking about part drawings, 398 00:16:03,030 --> 00:16:04,190 and we're going to talk about 399 00:16:04,469 --> 00:16:08,390 assembly drawings. And in this case, I'm showing you a five 400 00:16:08,390 --> 00:16:12,789 sheet assembly drawing for the NES game controller by Nintendo. 401 00:16:13,190 --> 00:16:16,020 Now, it's five sheets because we need to know 402 00:16:16,469 --> 00:16:18,619 this thing in the top left corner 403 00:16:18,909 --> 00:16:20,820 is just an isometric 404 00:16:21,409 --> 00:16:22,520 screenshot 405 00:16:22,869 --> 00:16:25,020 just to let you know the object that we're working on. 406 00:16:25,070 --> 00:16:27,590 It's not part of the actual drawing set. 407 00:16:28,109 --> 00:16:28,349 All right, 408 00:16:28,510 --> 00:16:29,830 so within this drawing set, 409 00:16:29,919 --> 00:16:30,469 however, 410 00:16:31,690 --> 00:16:36,090 there are five sheets. And we're going to take a look at just three of those sheets— 411 00:16:36,239 --> 00:16:36,760 sheet 1, 412 00:16:37,000 --> 00:16:37,559 sheet 2, 413 00:16:37,599 --> 00:16:38,469 and sheet 3. 414 00:16:38,640 --> 00:16:39,830 The other sheets are valuable, 415 00:16:39,960 --> 00:16:42,799 but they're not going to teach us anything new about how to interpret 416 00:16:43,650 --> 00:16:44,739 an assembly drawing, 417 00:16:44,789 --> 00:16:46,460 which is what we're gonna do right now. 418 00:16:46,799 --> 00:16:47,260 All right, 419 00:16:47,549 --> 00:16:49,869 take a look at this first sheet 420 00:16:50,150 --> 00:16:50,820 of the 421 00:16:51,030 --> 00:16:54,940 Nintendo NES game controller, and let's notice first of all 422 00:16:55,270 --> 00:16:57,710 the things that are similar from the part drawing, 423 00:16:58,570 --> 00:16:59,969 part drawings that we looked at. 424 00:17:00,320 --> 00:17:03,450 Sheet formats the same exact concept; zone marker, 425 00:17:03,609 --> 00:17:07,930 same concept; revision block, the same; title block, same concept; 426 00:17:07,930 --> 00:17:12,640 general notes, same concept. We have orthographic projection views here. 427 00:17:13,089 --> 00:17:16,848 We also have isometric views, and we also have dimensions. 428 00:17:17,010 --> 00:17:18,290 So, what's new then? 429 00:17:18,479 --> 00:17:18,709 Well, 430 00:17:18,930 --> 00:17:20,358 there are some new things here. 431 00:17:20,810 --> 00:17:22,680 We have assembly dimensions. 432 00:17:22,890 --> 00:17:25,810 These are dimensions that don't exist on any part drawing. 433 00:17:26,208 --> 00:17:30,529 This is one of the main purposes of assembly drawings is to help convey 434 00:17:30,889 --> 00:17:32,519 dimensions that are essential, 435 00:17:32,848 --> 00:17:34,649 but don't exist on part drawings. 436 00:17:34,729 --> 00:17:35,438 For example, 437 00:17:35,808 --> 00:17:36,598 this is 438 00:17:37,078 --> 00:17:38,918 measuring from one edge 439 00:17:39,660 --> 00:17:42,579 of a part to another edge of another part. 440 00:17:43,369 --> 00:17:45,369 That 17.20. 441 00:17:45,920 --> 00:17:46,079 All right. 442 00:17:46,119 --> 00:17:49,890 We also can notice here in the title block 443 00:17:50,199 --> 00:17:52,150 that material and finish 444 00:17:52,520 --> 00:17:54,630 don't make a lot of sense 445 00:17:54,920 --> 00:17:57,359 in an assembly drawing because the assembly is 446 00:17:57,359 --> 00:18:00,599 made up of various parts that all have potentially 447 00:18:00,880 --> 00:18:03,030 different materials and different finishes. 448 00:18:03,359 --> 00:18:05,510 And therefore, it is traditional 449 00:18:05,839 --> 00:18:06,949 and expected 450 00:18:07,160 --> 00:18:09,000 that those bits of information 451 00:18:09,380 --> 00:18:11,099 don't exist on the assembly drawing, 452 00:18:11,140 --> 00:18:13,500 but that the reader of the assembly drawing is 453 00:18:14,750 --> 00:18:16,680 encouraged or directed 454 00:18:16,949 --> 00:18:19,089 to the actual art drawings. 455 00:18:19,390 --> 00:18:19,670 All right, 456 00:18:19,790 --> 00:18:20,310 let's 457 00:18:20,709 --> 00:18:21,410 take 458 00:18:22,209 --> 00:18:23,449 a look at, 459 00:18:23,729 --> 00:18:23,800 oh, 460 00:18:23,930 --> 00:18:26,439 that's the part that I just talked about right now. 461 00:18:27,439 --> 00:18:28,060 OK. 462 00:18:28,500 --> 00:18:30,209 Now on to sheet 2. 463 00:18:30,459 --> 00:18:30,739 All right. 464 00:18:30,939 --> 00:18:31,969 For sheet 2, 465 00:18:32,020 --> 00:18:36,020 it's essential to realize that there is a new kind of auxiliary 466 00:18:36,020 --> 00:18:39,010 view that we're looking at now and it's called an exploded view. 467 00:18:39,420 --> 00:18:41,180 And the beauty of the exploded view 468 00:18:42,410 --> 00:18:45,319 is that it's broken up the part into all of its 469 00:18:45,319 --> 00:18:47,550 pieces so we can take a deeper look at them. 470 00:18:47,920 --> 00:18:48,170 Now, 471 00:18:48,199 --> 00:18:50,760 each of the parts has a callout balloon on it. 472 00:18:51,030 --> 00:18:55,739 And the callout balloon has a corresponding line in this table which 473 00:18:55,739 --> 00:18:59,489 is called the bill of materials or sometimes called the part list, 474 00:18:59,500 --> 00:19:01,500 but we will call it the bill of materials. 475 00:19:01,619 --> 00:19:03,439 Now, all of the objects 476 00:19:03,819 --> 00:19:04,770 in 477 00:19:05,099 --> 00:19:06,689 this particular assembly 478 00:19:06,939 --> 00:19:11,369 have a callout balloon and have a location in the bill of materials. 479 00:19:11,500 --> 00:19:15,660 Also, in the assembly drawing, we can notice the thing that's called the explode line. 480 00:19:15,959 --> 00:19:19,469 The explode line helps to understand that, for example, 481 00:19:19,469 --> 00:19:23,510 the bottom left the screw goes through that bottom cover 482 00:19:23,959 --> 00:19:25,229 through the circuit board 483 00:19:25,640 --> 00:19:26,109 through 484 00:19:26,359 --> 00:19:29,579 the membrane and up into the top cover, 485 00:19:29,839 --> 00:19:31,550 and it is an indication 486 00:19:31,800 --> 00:19:32,949 of how these 487 00:19:33,280 --> 00:19:35,390 parts line up with each other. 488 00:19:35,760 --> 00:19:35,959 OK. 489 00:19:36,010 --> 00:19:38,199 We're now going to take a look at step, excuse me, 490 00:19:38,349 --> 00:19:39,160 sheet 3. 491 00:19:39,459 --> 00:19:40,750 And in sheet 3, 492 00:19:40,959 --> 00:19:41,869 we're going to see 493 00:19:42,199 --> 00:19:46,030 that a number of things are the same as they were in part drawings. 494 00:19:46,469 --> 00:19:46,869 For example, 495 00:19:46,959 --> 00:19:48,000 the section markers, 496 00:19:48,079 --> 00:19:49,040 the section views, 497 00:19:49,160 --> 00:19:50,079 the general nodes, 498 00:19:50,199 --> 00:19:51,359 the specific notes. 499 00:19:52,140 --> 00:19:53,609 But we now have a new thing 500 00:19:53,839 --> 00:19:57,239 that could have existed in a part drawing but it 501 00:19:57,239 --> 00:19:59,910 didn't exist in our part drawing for the turbocharger. 502 00:19:59,959 --> 00:20:01,109 It exists in this one, 503 00:20:01,280 --> 00:20:03,150 so I thought I'd take a second to talk about it 504 00:20:03,319 --> 00:20:05,109 and that is called the detail view. 505 00:20:05,439 --> 00:20:07,989 And a detail view is another auxiliary view 506 00:20:08,280 --> 00:20:11,280 and what it is is it's a zoomed in portion 507 00:20:11,839 --> 00:20:12,380 of 508 00:20:12,589 --> 00:20:16,819 the stuff that's inside the detail view marker. 509 00:20:16,949 --> 00:20:19,420 The detail view marker is that circular 510 00:20:19,790 --> 00:20:23,099 line that has two arrows on it pointing to a D, in this case, 511 00:20:23,349 --> 00:20:24,859 and that line is dashed. 512 00:20:25,150 --> 00:20:26,459 And that tells us 513 00:20:26,790 --> 00:20:29,979 that we're gonna zoom in on that area, and it's going to appear 514 00:20:30,280 --> 00:20:33,579 somewhere else on the drawing, and it's going to tell us something that is 515 00:20:33,910 --> 00:20:36,109 otherwise hard to look at at the size 516 00:20:36,459 --> 00:20:38,760 that it exists normally in the drawing. 517 00:20:39,050 --> 00:20:39,380 OK. 518 00:20:39,489 --> 00:20:42,640 So, that's what you need to know about assembly drawings 519 00:20:43,010 --> 00:20:43,640 and 520 00:20:44,050 --> 00:20:46,560 what you need to know about part drawings. 521 00:20:46,609 --> 00:20:47,040 So, 522 00:20:47,579 --> 00:20:49,359 before we leave this whole topic, 523 00:20:49,449 --> 00:20:51,099 I think it's worth saying 524 00:20:51,329 --> 00:20:52,199 a few things. 525 00:20:52,530 --> 00:20:54,849 And item number 1 here is 526 00:20:55,849 --> 00:20:56,599 I hope 527 00:20:56,829 --> 00:20:59,859 that when you look at the engineering drawings, they won't look 528 00:20:59,859 --> 00:21:03,339 as daunting as they did before we had this small discussion. 529 00:21:03,670 --> 00:21:05,020 But what I hope mostly 530 00:21:05,270 --> 00:21:07,790 is that you'll actually look at the engineering drawings. 531 00:21:08,170 --> 00:21:10,849 You need to spend some time with the engineering drawings. 532 00:21:10,920 --> 00:21:11,329 OK. 533 00:21:11,369 --> 00:21:14,250 I want to spend 5 to 10 minutes with each of the drawings. 534 00:21:14,290 --> 00:21:14,400 OK. 535 00:21:14,410 --> 00:21:15,760 We want to examine 536 00:21:16,130 --> 00:21:16,599 each 537 00:21:16,849 --> 00:21:19,880 engineering drawing starting with the title block, 538 00:21:20,130 --> 00:21:21,319 then with the notes 539 00:21:21,930 --> 00:21:22,959 on page one. 540 00:21:23,209 --> 00:21:24,969 Then, we want to look at the views, 541 00:21:25,180 --> 00:21:28,260 try to understand what the views can tell us and why they're there. 542 00:21:28,489 --> 00:21:31,130 We want to try to envision the geometry. 543 00:21:32,150 --> 00:21:35,310 We want to do the same then for all those pages. 544 00:21:35,719 --> 00:21:37,420 And we wanna look for details 545 00:21:37,719 --> 00:21:42,650 such as specific dimensions or specific details that maybe 546 00:21:42,650 --> 00:21:44,640 in a detail view or in a section view. 547 00:21:45,130 --> 00:21:45,650 OK. 548 00:21:45,859 --> 00:21:47,569 Just as a final recap on here, 549 00:21:47,579 --> 00:21:48,609 we're after 550 00:21:49,060 --> 00:21:51,770 getting good at CAD fluency. 551 00:21:51,900 --> 00:21:57,170 CAD fluency starts by having a good understanding of why you need to create a model. 552 00:21:57,540 --> 00:22:01,209 That model understanding can come from a variety of places, 553 00:22:01,430 --> 00:22:03,219 including talking to a client 554 00:22:03,500 --> 00:22:04,089 or 555 00:22:04,550 --> 00:22:07,000 following a product development process for a given company. 556 00:22:07,395 --> 00:22:10,295 In this case, in this course, we're gonna 557 00:22:10,295 --> 00:22:13,084 have a number of exercises at the beginning here 558 00:22:13,375 --> 00:22:17,334 where you create geometry that's conveyed to you in an engineering drawing. So, 559 00:22:17,334 --> 00:22:20,964 you need to learn how to read those engineering drawings. And this video 560 00:22:21,375 --> 00:22:22,444 demystified them 561 00:22:22,694 --> 00:22:23,574 just a little bit 562 00:22:23,814 --> 00:22:25,685 hopefully making them less daunting, 563 00:22:26,175 --> 00:22:29,214 something you're willing to engage with and to actually read.