1 00:00:00,119 --> 00:00:02,150 Reading an engineering drawing is hard. 2 00:00:02,359 --> 00:00:06,210 It's a foreign language and it takes practice and it takes skill 3 00:00:06,599 --> 00:00:08,720 to know how to read those engineering drawings. 4 00:00:09,500 --> 00:00:10,880 In this particular course, 5 00:00:11,010 --> 00:00:15,600 I know you've been given some complex drawing sets that you need to try to digest. 6 00:00:15,930 --> 00:00:18,760 It can be frustrating and it is definitely difficult. 7 00:00:19,049 --> 00:00:20,440 In this particular video, 8 00:00:20,690 --> 00:00:23,559 I'm gonna take you straight into my iPad and together 9 00:00:23,770 --> 00:00:27,940 we're gonna look around at the engineering drawing for the NES 10 00:00:28,569 --> 00:00:32,770 front cover for the Nintendo game controller for the NES system. 11 00:00:33,110 --> 00:00:35,750 And what I'm going to do is talk through 12 00:00:36,159 --> 00:00:38,790 how to extract essential information 13 00:00:39,159 --> 00:00:39,590 from 14 00:00:39,799 --> 00:00:41,450 the engineering drawing set. 15 00:00:41,770 --> 00:00:42,110 All right, 16 00:00:42,279 --> 00:00:44,340 so just pulling a chair up over here, 17 00:00:44,599 --> 00:00:46,630 looking at the engineering drawing now. 18 00:00:48,090 --> 00:00:50,979 Any time you have an engineering drawing, 19 00:00:51,169 --> 00:00:55,409 you've got to spend time actually reading the engineering drawing 20 00:00:55,750 --> 00:00:58,639 and so what I've what I'm doing right now, 21 00:00:58,939 --> 00:01:00,450 I'm taking a look at a couple of things, 22 00:01:00,569 --> 00:01:02,889 maybe I'll highlight where I'm sort of looking. 23 00:01:03,369 --> 00:01:05,449 First thing I'm doing is I've come down here to 24 00:01:05,449 --> 00:01:09,620 see how many pages or sheets are in this drawing set 25 00:01:09,930 --> 00:01:11,650 that's alerting me to 26 00:01:12,330 --> 00:01:16,199 the extent of the information that I need to be looking for 27 00:01:16,410 --> 00:01:17,319 and through. 28 00:01:18,639 --> 00:01:22,709 I'm also taking a look at what's going on up here with the revision block. 29 00:01:23,239 --> 00:01:27,029 I'm seeing that there was a corrected dimension on a rim groove. 30 00:01:27,400 --> 00:01:31,550 I like to just know what rev I'm looking at and why I'm looking at it. 31 00:01:32,120 --> 00:01:32,529 I 32 00:01:32,680 --> 00:01:36,599 like to start by just sort of glancing through each of the sheets 33 00:01:37,000 --> 00:01:40,709 and understanding what I might be seeing on each of the pages. 34 00:01:41,199 --> 00:01:41,750 In this case, 35 00:01:41,839 --> 00:01:42,279 I 36 00:01:42,319 --> 00:01:45,440 am seeing the front face and I'm seeing the front face again 37 00:01:45,970 --> 00:01:49,319 with a bunch of dimensions here for the whole cutouts, 38 00:01:49,650 --> 00:01:51,919 and then there seems to be this little rim 39 00:01:52,569 --> 00:01:55,319 that goes around this stuff right here, 40 00:01:55,610 --> 00:01:57,959 these seem to be defined in this view. 41 00:01:58,839 --> 00:01:59,739 Right here, 42 00:02:00,480 --> 00:02:02,720 seeing another cross-section and another note. 43 00:02:03,930 --> 00:02:04,209 OK, 44 00:02:04,309 --> 00:02:06,949 on this one, I'm seeing all of the underside 45 00:02:07,510 --> 00:02:08,139 objects 46 00:02:08,470 --> 00:02:12,300 as well as having an ISO view here which is helpful, 47 00:02:12,550 --> 00:02:14,669 so don't have to go all the way back to sheet 1. 48 00:02:14,990 --> 00:02:17,589 I can see that this page is going to be 49 00:02:17,949 --> 00:02:21,250 helping me understand how to create these thin-walled 50 00:02:21,690 --> 00:02:24,229 features that are sort of in these areas. 51 00:02:25,520 --> 00:02:25,779 OK, 52 00:02:25,899 --> 00:02:28,690 and then I see there's at least 3 cross-sections here, 53 00:02:29,020 --> 00:02:31,490 just trying to get a sense for what's in the drawing. 54 00:02:31,860 --> 00:02:34,529 And then here all these screw bosses, 55 00:02:34,779 --> 00:02:37,070 this is a screw boss right here by the way, 56 00:02:37,440 --> 00:02:40,669 all these screw bosses are defined, their location, 57 00:02:41,139 --> 00:02:42,089 their heights, 58 00:02:42,460 --> 00:02:42,899 etc. 59 00:02:45,009 --> 00:02:47,970 And then in the last page of the drawing, 60 00:02:48,460 --> 00:02:50,009 we have this whole, 61 00:02:50,300 --> 00:02:52,990 this whole situation that's going on in detail 62 00:02:53,020 --> 00:02:53,429 'J' 63 00:02:54,020 --> 00:02:55,529 is being defined out 64 00:02:55,860 --> 00:02:56,889 on this sheet. 65 00:02:57,179 --> 00:02:59,619 That's where the cable comes out of the controller. 66 00:03:00,089 --> 00:03:02,399 And so, I've spent about a minute 67 00:03:02,699 --> 00:03:04,699 just glancing through these five sheets. 68 00:03:04,779 --> 00:03:06,339 I have a sense for what's in here. 69 00:03:06,419 --> 00:03:07,770 I haven't absorbed any 70 00:03:08,139 --> 00:03:09,300 deep information yet, 71 00:03:09,380 --> 00:03:10,169 but I have 72 00:03:10,500 --> 00:03:13,570 checked to just sort of see what is there, 73 00:03:13,779 --> 00:03:14,130 OK? 74 00:03:14,259 --> 00:03:18,449 I've also spent a little bit of time glancing at the title block, 75 00:03:18,899 --> 00:03:20,729 particularly in this area, 76 00:03:21,539 --> 00:03:23,419 to understand a couple of things. 77 00:03:23,970 --> 00:03:26,929 This model needs to be created in millimeter units. 78 00:03:27,250 --> 00:03:29,320 The model material 79 00:03:29,970 --> 00:03:31,339 needs to be ABS, 80 00:03:31,649 --> 00:03:33,679 and then there is a texture on it, 81 00:03:33,770 --> 00:03:35,880 MT11010, 82 00:03:36,410 --> 00:03:39,000 and there is a color specification that's given. 83 00:03:39,410 --> 00:03:41,850 So, there's a lot of stuff that's been given right there that's 84 00:03:41,850 --> 00:03:44,279 going to be essential for me as I create this model, 85 00:03:44,850 --> 00:03:47,360 especially as I begin the modeling process, 86 00:03:47,449 --> 00:03:50,529 I've got to absolutely make sure that my units are right, 87 00:03:51,320 --> 00:03:54,839 that can cause a bit of trouble if I'm starting in inches. 88 00:03:55,550 --> 00:03:58,240 And then I need to switch this to millimeters. 89 00:03:59,119 --> 00:04:01,880 The other thing I'm noticing here that's quite helpful for me 90 00:04:02,279 --> 00:04:06,690 is this data right here that shows what the mass 91 00:04:06,960 --> 00:04:09,110 of this finished top cover is. 92 00:04:09,399 --> 00:04:11,460 That's going to be helpful for me as I 93 00:04:11,839 --> 00:04:14,270 analyze my model and go along, 94 00:04:15,039 --> 00:04:15,350 during 95 00:04:15,350 --> 00:04:16,238 the modeling process, 96 00:04:16,279 --> 00:04:18,070 that's going to be helpful 97 00:04:18,279 --> 00:04:18,678 to me. 98 00:04:19,358 --> 00:04:19,760 OK, 99 00:04:19,880 --> 00:04:23,690 so that's the first part of just sort of absorbing 100 00:04:24,000 --> 00:04:26,630 an engineering drawing set is just to 101 00:04:26,959 --> 00:04:28,679 give it a once over, 102 00:04:29,750 --> 00:04:33,399 then we need to start thinking about how to extract out 103 00:04:33,829 --> 00:04:37,070 the essential information that's in this drawing. 104 00:04:37,269 --> 00:04:37,450 Now, 105 00:04:37,510 --> 00:04:38,600 a couple of tips. 106 00:04:38,910 --> 00:04:39,959 Item number 1 107 00:04:40,799 --> 00:04:43,350 is that engineering drawings are often 108 00:04:44,040 --> 00:04:47,029 created in a sort of hierarchical way, 109 00:04:47,440 --> 00:04:51,309 meaning that the top level information is on page 1 110 00:04:51,600 --> 00:04:54,380 and the more detailed information is later 111 00:04:54,640 --> 00:04:55,559 in the process. 112 00:04:56,049 --> 00:04:58,350 So, if you're getting started with your model, 113 00:04:58,630 --> 00:05:03,279 the first CAD modeling steps are likely going to be coming from 114 00:05:03,279 --> 00:05:06,549 the details found in the first couple of pages of the drawing 115 00:05:06,799 --> 00:05:08,079 versus the latter 116 00:05:08,440 --> 00:05:09,170 pages 117 00:05:09,399 --> 00:05:10,920 or sheets in the drawing. 118 00:05:11,019 --> 00:05:12,149 So, for example, 119 00:05:12,440 --> 00:05:17,470 if I was going to start the process of making this model, 120 00:05:17,799 --> 00:05:20,190 I've got to ask myself some key things like 121 00:05:20,519 --> 00:05:22,920 what is the overall width and what is the overall height, 122 00:05:23,000 --> 00:05:24,399 and what is the overall thickness 123 00:05:25,070 --> 00:05:27,540 of this basic prism 124 00:05:27,869 --> 00:05:29,899 that this thing is made of? 125 00:05:31,239 --> 00:05:34,850 Take a look at the drawing now and see if you can extract that out 126 00:05:35,480 --> 00:05:36,630 in a reasonable 127 00:05:36,920 --> 00:05:37,390 way. 128 00:05:38,829 --> 00:05:41,739 What you should be looking for here is 129 00:05:42,070 --> 00:05:43,380 the largest dimension, 130 00:05:43,470 --> 00:05:44,700 here is my length. 131 00:05:45,510 --> 00:05:50,750 My next dimension here is my total sort of height as it would appear in this 132 00:05:51,630 --> 00:05:51,869 or 133 00:05:51,989 --> 00:05:52,589 the width, 134 00:05:52,670 --> 00:05:53,769 I guess we could say 135 00:05:54,109 --> 00:05:55,100 in this view, 136 00:05:55,429 --> 00:05:58,140 and then I have the height or the thickness 137 00:05:58,880 --> 00:05:59,880 of this 138 00:06:00,239 --> 00:06:02,510 overall part shown right here. 139 00:06:02,839 --> 00:06:07,950 These three dimensions are essential for me as I get started in my CAD model 140 00:06:08,320 --> 00:06:10,410 because I'm gonna start by creating 141 00:06:10,839 --> 00:06:15,700 some chunk of material out of which I will cut out a bunch of holes and other stuff 142 00:06:16,040 --> 00:06:16,750 like this 143 00:06:17,239 --> 00:06:19,029 and these three dimensions, 144 00:06:19,290 --> 00:06:20,119 the width. 145 00:06:21,000 --> 00:06:21,470 Excuse me, 146 00:06:21,480 --> 00:06:22,029 the length, 147 00:06:22,179 --> 00:06:22,829 the width, 148 00:06:22,920 --> 00:06:23,890 and the height 149 00:06:24,239 --> 00:06:25,750 are super helpful. 150 00:06:26,040 --> 00:06:30,920 But I can also notice a really important thing that's going on here and that is that 151 00:06:31,279 --> 00:06:32,320 we 152 00:06:32,720 --> 00:06:33,950 have 153 00:06:36,070 --> 00:06:36,970 basically 154 00:06:36,970 --> 00:06:37,579 like 155 00:06:37,779 --> 00:06:38,940 a trapezoidal 156 00:06:39,470 --> 00:06:40,100 prism 157 00:06:40,350 --> 00:06:41,220 in this shape. 158 00:06:41,429 --> 00:06:41,790 In other words, 159 00:06:41,820 --> 00:06:42,980 they do not have 160 00:06:43,230 --> 00:06:44,350 vertical walls. 161 00:06:45,459 --> 00:06:49,779 And this means I'm going to have to start my CAD work in a particular way, 162 00:06:50,190 --> 00:06:53,190 because the first piece that I wanna pop in here 163 00:06:54,470 --> 00:06:56,299 that isn't actually going to be 164 00:06:56,549 --> 00:06:57,670 a rectangular prism, 165 00:06:57,720 --> 00:07:00,619 it's going to be more like a trapezoidal prism, 166 00:07:00,910 --> 00:07:02,839 and I have to start to understand 167 00:07:03,429 --> 00:07:04,329 that shape. 168 00:07:04,630 --> 00:07:06,779 This is what it looks like from the right side, 169 00:07:07,170 --> 00:07:09,799 also from the front view right here, 170 00:07:10,109 --> 00:07:11,619 we're seeing the same thing, 171 00:07:11,790 --> 00:07:12,010 OK, 172 00:07:12,109 --> 00:07:13,059 we're seeing a 173 00:07:13,350 --> 00:07:14,480 trapezoidal 174 00:07:14,829 --> 00:07:16,589 inward sort of 175 00:07:17,929 --> 00:07:20,040 slanting to those walls. 176 00:07:20,209 --> 00:07:21,079 So, this is a really, 177 00:07:21,320 --> 00:07:24,239 really important bit of information to extract from 178 00:07:24,570 --> 00:07:25,369 this drawing set. 179 00:07:25,529 --> 00:07:25,720 Now, 180 00:07:25,769 --> 00:07:28,609 the major question is how much does it slant in? 181 00:07:29,480 --> 00:07:29,989 Well, 182 00:07:30,200 --> 00:07:32,829 we luckily have this detail view right here 183 00:07:33,119 --> 00:07:37,750 that is telling us that something important is going on in this section, 184 00:07:38,079 --> 00:07:40,630 and we can go find that in Detail A. 185 00:07:41,040 --> 00:07:42,040 Let's go find Detail A. 186 00:07:42,119 --> 00:07:43,190 Here's Detail A. 187 00:07:44,570 --> 00:07:44,950 And 188 00:07:45,149 --> 00:07:46,799 Detail A has 189 00:07:47,290 --> 00:07:48,820 some important information and frankly, 190 00:07:48,929 --> 00:07:50,760 we need to step back just a second 191 00:07:51,130 --> 00:07:51,839 and say, 192 00:07:52,869 --> 00:07:56,700 "One of the first things we have to do whenever we start the drawing, 193 00:07:56,709 --> 00:07:57,230 reading, 194 00:07:57,309 --> 00:07:58,019 the drawing, 195 00:07:58,149 --> 00:07:58,559 the 196 00:07:58,589 --> 00:08:02,540 reading of the drawing is we need to really pay attention to the notes. 197 00:08:02,910 --> 00:08:04,420 The notes are there to help, 198 00:08:04,709 --> 00:08:04,899 like, 199 00:08:04,910 --> 00:08:07,500 to guide and to give direction and to help, 200 00:08:07,829 --> 00:08:09,160 you know what 201 00:08:09,549 --> 00:08:11,970 the creator of the drawing wanted you to know. 202 00:08:12,470 --> 00:08:13,600 So, we can see, 203 00:08:13,630 --> 00:08:14,149 for example, 204 00:08:14,309 --> 00:08:16,299 hidden lines are removed for clarity. 205 00:08:16,880 --> 00:08:17,609 OK, 206 00:08:17,809 --> 00:08:20,920 there's a virtual sharp in Detail A that's 207 00:08:20,920 --> 00:08:23,640 interesting because we're looking at Detail A right now, 208 00:08:24,049 --> 00:08:27,119 and there's something about detail A that's being told to us. 209 00:08:27,730 --> 00:08:30,549 General wall thicknesses are shown in section AA. 210 00:08:30,570 --> 00:08:30,649 Well, 211 00:08:30,809 --> 00:08:32,400 here's section AA, 212 00:08:32,820 --> 00:08:33,489 OK? 213 00:08:33,929 --> 00:08:37,770 And section AA is shown as a slice and not a full cross-section. 214 00:08:38,258 --> 00:08:39,698 If it was a full cross-section, 215 00:08:39,739 --> 00:08:40,979 what this would mean 216 00:08:41,258 --> 00:08:43,129 is that we would actually see 217 00:08:43,457 --> 00:08:45,658 the rest of the object here 218 00:08:45,898 --> 00:08:46,939 without a crosshatch, 219 00:08:47,018 --> 00:08:48,338 but we'd be able to see, 220 00:08:48,698 --> 00:08:48,818 you know, 221 00:08:48,939 --> 00:08:51,328 there'd be like posts and some other stuff, 222 00:08:51,698 --> 00:08:52,098 and it 223 00:08:52,138 --> 00:08:53,568 would get quite cluttered. 224 00:08:53,658 --> 00:08:54,568 So, in this case, 225 00:08:54,939 --> 00:08:55,989 for clarity's sake, 226 00:08:56,138 --> 00:08:59,208 section AA was provided as only a slice. 227 00:09:00,539 --> 00:09:01,219 OK, 228 00:09:01,469 --> 00:09:03,219 now what is a virtual sharp? 229 00:09:03,299 --> 00:09:03,549 OK, 230 00:09:03,590 --> 00:09:07,419 we need to go understand what a virtual sharp is. Because a virtual sharp 231 00:09:07,719 --> 00:09:10,179 is appearing in detail A 232 00:09:10,510 --> 00:09:12,299 and this is an important 233 00:09:12,669 --> 00:09:15,979 part of knowing how the trapezoidal prism 234 00:09:16,270 --> 00:09:17,979 geometry should be made. 235 00:09:18,469 --> 00:09:20,429 So, this little thing that we have here, 236 00:09:20,469 --> 00:09:22,700 I'm going to point to it right now before I draw on it, 237 00:09:22,950 --> 00:09:24,580 that little plus that's there 238 00:09:24,869 --> 00:09:26,469 is the virtual sharp. 239 00:09:26,940 --> 00:09:28,330 What this means is 240 00:09:28,700 --> 00:09:30,890 that if this object 241 00:09:31,500 --> 00:09:33,109 did not have a fillet 242 00:09:33,789 --> 00:09:35,080 in its corner, 243 00:09:35,250 --> 00:09:35,650 right up there, 244 00:09:35,729 --> 00:09:37,359 there's a fillet right in there. 245 00:09:37,770 --> 00:09:39,200 It would have a sharp point, 246 00:09:39,530 --> 00:09:41,280 like what we're seeing right over here. 247 00:09:41,570 --> 00:09:43,359 And that sharp point 248 00:09:43,690 --> 00:09:46,010 would be something that could be dimension too. 249 00:09:47,530 --> 00:09:50,690 And when that sharp point goes away, 250 00:09:51,020 --> 00:09:54,820 such as when there's a filet that's added to something like this, 251 00:09:57,020 --> 00:09:57,549 then 252 00:09:57,760 --> 00:09:57,810 a 253 00:09:57,760 --> 00:09:59,750 marker can go right here. 254 00:10:00,000 --> 00:10:02,070 Let's see if I can switch this color 255 00:10:02,520 --> 00:10:03,340 and 256 00:10:03,640 --> 00:10:05,190 make this even more obvious, 257 00:10:05,640 --> 00:10:06,190 OK? 258 00:10:06,520 --> 00:10:11,179 Then a marker can go right there exactly where the sharp point would have been, 259 00:10:11,479 --> 00:10:11,820 therefore 260 00:10:11,840 --> 00:10:13,609 it is called a virtual sharp. 261 00:10:13,919 --> 00:10:16,150 That can be valuable because 262 00:10:16,440 --> 00:10:18,289 if we want to dimension 263 00:10:18,960 --> 00:10:19,719 to that 264 00:10:20,210 --> 00:10:22,179 we can and we do the dimension to 265 00:10:22,179 --> 00:10:24,890 the virtual sharp and that's actually what's going on 266 00:10:25,250 --> 00:10:25,729 right here. 267 00:10:25,849 --> 00:10:28,000 This 0.85 typical 268 00:10:28,369 --> 00:10:30,590 is going to this virtual sharp. 269 00:10:30,849 --> 00:10:32,280 That helps us to know 270 00:10:32,650 --> 00:10:33,770 what size 271 00:10:36,349 --> 00:10:37,820 that trapezoidal prism 272 00:10:38,070 --> 00:10:39,099 is made at. 273 00:10:39,729 --> 00:10:39,869 All right, 274 00:10:40,039 --> 00:10:44,549 so I'm seeing those 3 or 4 critical dimensions that help 275 00:10:44,549 --> 00:10:48,419 me get my first chunk of material into the CAD system. 276 00:10:49,070 --> 00:10:52,580 Once I have that basic chunk of material into the CAD system, 277 00:10:52,909 --> 00:10:55,739 it's a matter of me starting to chip away 278 00:10:56,030 --> 00:10:57,200 at producing 279 00:10:57,549 --> 00:10:59,940 the geometries associated with that. 280 00:11:00,500 --> 00:11:00,940 So, 281 00:11:01,140 --> 00:11:01,809 I 282 00:11:01,820 --> 00:11:03,099 can see that 283 00:11:03,619 --> 00:11:04,890 because there is 284 00:11:05,340 --> 00:11:07,609 some attempt to describe, 285 00:11:07,780 --> 00:11:09,530 I'll switch colors here for a second, 286 00:11:09,780 --> 00:11:13,729 there's some attempt to describe a general wall thickness, 287 00:11:14,140 --> 00:11:17,049 it's most likely that a shell is used 288 00:11:17,380 --> 00:11:18,780 somewhere in this set, 289 00:11:18,820 --> 00:11:21,469 because the shell gives us a nice constant 290 00:11:21,909 --> 00:11:26,390 wall thickness, and I can see that the wall thickness is shown in section AA, 291 00:11:26,780 --> 00:11:27,539 (whereas it's shown), 292 00:11:27,580 --> 00:11:28,650 it's right here. 293 00:11:29,520 --> 00:11:30,119 OK. 294 00:11:31,159 --> 00:11:33,429 If we're going to look at something that's called general. 295 00:11:34,909 --> 00:11:36,940 Then we're gonna look for something that's called typical 296 00:11:38,000 --> 00:11:39,840 because typical 'TYP' 297 00:11:40,200 --> 00:11:41,140 means that 298 00:11:41,510 --> 00:11:42,940 this same thickness 299 00:11:43,510 --> 00:11:44,349 that's here 300 00:11:44,669 --> 00:11:49,669 also exists here, and also exists here, and also exists here, and also exists here, and 301 00:11:49,989 --> 00:11:51,280 here, and here 302 00:11:51,869 --> 00:11:52,400 and 303 00:11:52,549 --> 00:11:53,309 throughout. 304 00:11:54,229 --> 00:11:55,700 It's a little different over here, 305 00:11:55,780 --> 00:11:56,200 but 306 00:11:56,460 --> 00:11:57,369 nevertheless, 307 00:11:57,739 --> 00:11:58,619 everywhere 308 00:11:59,450 --> 00:12:02,039 in those areas, we would have constant wall thickness. 309 00:12:02,109 --> 00:12:02,469 So, 310 00:12:02,950 --> 00:12:03,669 what have I done? 311 00:12:03,750 --> 00:12:05,270 I have gone into my drawing. 312 00:12:05,309 --> 00:12:09,299 I've tried to figure out how am I going to create my first basic shape. 313 00:12:09,789 --> 00:12:12,940 I've looked at the drawing to pick out 314 00:12:13,299 --> 00:12:16,869 the, the dimensions that are most likely the 315 00:12:16,869 --> 00:12:19,659 ones that I need to create that basic geometry. 316 00:12:20,270 --> 00:12:20,619 Now 317 00:12:20,960 --> 00:12:22,119 it's worth knowing 318 00:12:22,590 --> 00:12:26,299 that there's a lot of information here that's not needed yet. 319 00:12:27,280 --> 00:12:27,520 OK, 320 00:12:27,599 --> 00:12:30,950 so I'm trying to build out my basic trapezoidal prism. 321 00:12:31,299 --> 00:12:33,520 There's some stuff I just don't have to worry about, 322 00:12:33,559 --> 00:12:33,799 OK? 323 00:12:33,840 --> 00:12:35,429 I don't have to worry about, 324 00:12:35,719 --> 00:12:36,000 you know, 325 00:12:36,119 --> 00:12:36,880 this dimension, 326 00:12:36,940 --> 00:12:37,440 for example, 327 00:12:37,479 --> 00:12:38,630 or this dimension. 328 00:12:38,919 --> 00:12:40,590 Those are going to come later. 329 00:12:40,880 --> 00:12:42,799 And the reason why this is important is because 330 00:12:42,799 --> 00:12:45,750 there's a lot of information on these drawing sets 331 00:12:46,140 --> 00:12:46,750 and 332 00:12:47,200 --> 00:12:49,479 you have to be able to start to pick out what 333 00:12:49,479 --> 00:12:53,010 is the important information and what is the not important information 334 00:12:53,320 --> 00:12:55,239 for the given step that you're working on. 335 00:12:55,630 --> 00:12:59,539 And if you had a CAD strategy and your CAD strategy looked something like this, 336 00:12:59,880 --> 00:13:01,190 like you're going to 337 00:13:01,830 --> 00:13:04,950 draw one plane and then I'm gonna switch colors here for a second. 338 00:13:05,119 --> 00:13:07,030 You're gonna draw another plane like this, 339 00:13:07,200 --> 00:13:07,700 OK? 340 00:13:08,070 --> 00:13:11,020 And then you are going to extrude between them 341 00:13:11,280 --> 00:13:14,270 and create some sort of trapezoidal prism. 342 00:13:14,559 --> 00:13:17,510 You would need to know how to first draw 343 00:13:18,200 --> 00:13:21,559 one of those sketches and then how to draw the other sketch, 344 00:13:21,900 --> 00:13:23,630 and what those dimensions would be. 345 00:13:23,710 --> 00:13:23,950 So, you're 346 00:13:25,010 --> 00:13:27,789 looking for those in the drawing set. 347 00:13:28,719 --> 00:13:29,349 All right, 348 00:13:29,479 --> 00:13:30,229 now, 349 00:13:30,559 --> 00:13:31,330 what 350 00:13:31,729 --> 00:13:32,719 else 351 00:13:32,799 --> 00:13:33,840 should we say about this, 352 00:13:33,880 --> 00:13:34,510 OK? 353 00:13:37,260 --> 00:13:38,609 It's important to know, 354 00:13:38,940 --> 00:13:40,390 while you are 355 00:13:40,780 --> 00:13:44,489 looking around drawings for particular bits of information, 356 00:13:44,820 --> 00:13:47,530 there's a couple of rules that you should know about. 357 00:13:47,979 --> 00:13:48,780 Number one, 358 00:13:50,409 --> 00:13:50,609 well, 359 00:13:50,770 --> 00:13:53,000 we don't have any hidden lines on this drawing, 360 00:13:53,010 --> 00:13:55,250 and that's actually good for you right now, 361 00:13:55,669 --> 00:13:55,909 but 362 00:13:56,010 --> 00:13:58,039 you should know that 363 00:13:58,130 --> 00:14:01,369 you're not allowed to dimension to hidden lines on drawings. 364 00:14:01,450 --> 00:14:03,640 This is part of the ASME standards. 365 00:14:03,890 --> 00:14:06,440 You're not allowed to dimension to a hidden line, 366 00:14:06,729 --> 00:14:08,450 and that would mean that if I wanted to know, 367 00:14:08,510 --> 00:14:09,400 for example, 368 00:14:09,729 --> 00:14:11,640 how tall is this post? 369 00:14:12,049 --> 00:14:14,010 Can we go look at the isometric view for a 370 00:14:14,010 --> 00:14:15,570 second so we can know what we're talking about. 371 00:14:15,700 --> 00:14:17,609 I want to know how high is that post. 372 00:14:18,289 --> 00:14:21,450 There's only one way for me to know this in this drawing set 373 00:14:21,450 --> 00:14:23,840 and that is that I have to look for a cross-section, 374 00:14:24,130 --> 00:14:24,530 OK? 375 00:14:24,609 --> 00:14:27,520 And so, let's go see if we can find that cross-section. 376 00:14:27,809 --> 00:14:27,909 Well, 377 00:14:27,929 --> 00:14:29,840 there's a cross-section B right here. 378 00:14:30,760 --> 00:14:31,239 OK, 379 00:14:31,479 --> 00:14:34,039 this is cross-section B and there's no post in that one, 380 00:14:34,080 --> 00:14:35,280 so that's not gonna be it. 381 00:14:35,950 --> 00:14:36,190 OK, 382 00:14:36,270 --> 00:14:38,270 here's some other cross-sections here, 383 00:14:38,650 --> 00:14:38,750 but 384 00:14:38,869 --> 00:14:41,270 none of them go through the post I was wanting, 385 00:14:41,309 --> 00:14:42,260 which was that one. 386 00:14:42,929 --> 00:14:43,419 OK. 387 00:14:43,909 --> 00:14:45,450 So that's a little bit 388 00:14:45,450 --> 00:14:46,059 difficult. 389 00:14:52,349 --> 00:14:52,450 See 390 00:14:52,450 --> 00:14:54,059 what else we have going on here. 391 00:14:55,049 --> 00:14:55,599 OK? 392 00:14:56,849 --> 00:14:57,020 "Oh, 393 00:14:57,030 --> 00:14:57,230 here 394 00:14:57,230 --> 00:14:57,710 we go. 395 00:14:58,090 --> 00:14:59,320 Section-F 396 00:15:00,049 --> 00:15:02,929 goes right through the exact post that I want, 397 00:15:03,330 --> 00:15:04,919 and here's section-F. 398 00:15:05,820 --> 00:15:06,450 Right here, 399 00:15:06,580 --> 00:15:08,250 and it is telling me 400 00:15:08,539 --> 00:15:09,770 the height of that post, 401 00:15:09,979 --> 00:15:12,979 the height of that post is 5.68. 402 00:15:14,150 --> 00:15:14,309 All right, 403 00:15:14,380 --> 00:15:16,150 the height of that post is 5.68. 404 00:15:16,390 --> 00:15:17,750 Another thing you should know about drawings 405 00:15:17,750 --> 00:15:20,780 is you're extracting information from drawings, 406 00:15:21,070 --> 00:15:22,299 and that is 407 00:15:22,669 --> 00:15:23,299 that 408 00:15:23,710 --> 00:15:24,820 lines that, 409 00:15:25,070 --> 00:15:25,510 for example, 410 00:15:25,559 --> 00:15:26,469 I'm gonna look right in here, 411 00:15:26,570 --> 00:15:27,010 OK? 412 00:15:27,349 --> 00:15:30,039 Lines that appear to be right angles 413 00:15:30,469 --> 00:15:33,030 are assumed to be right angles, 414 00:15:33,150 --> 00:15:34,549 that's supposed to be 90, 415 00:15:34,669 --> 00:15:34,989 OK. 416 00:15:36,429 --> 00:15:36,650 Lines 417 00:15:36,650 --> 00:15:39,590 that appear to be on the same line 418 00:15:39,789 --> 00:15:40,869 such as this 419 00:15:42,169 --> 00:15:44,640 are actually on the same line. 420 00:15:45,359 --> 00:15:47,679 And these are important things to know about drawing. 421 00:15:47,750 --> 00:15:48,729 So, for 422 00:15:48,729 --> 00:15:49,059 example, 423 00:15:50,190 --> 00:15:50,619 because, 424 00:15:50,789 --> 00:15:53,340 let's see if I can undo that one that I just did, 425 00:15:53,599 --> 00:15:53,979 OK. 426 00:15:54,309 --> 00:15:54,619 The 427 00:15:54,830 --> 00:15:56,940 height of this post 428 00:15:57,309 --> 00:15:58,460 is this much 429 00:15:58,830 --> 00:16:02,500 and the height of that post is also that same amount, 430 00:16:02,869 --> 00:16:07,900 5.68, because they appear to be on the same line, 431 00:16:08,530 --> 00:16:08,739 OK? 432 00:16:08,979 --> 00:16:11,140 Same thing goes with lines that are flat 433 00:16:11,390 --> 00:16:12,070 appear to be flat 434 00:16:12,150 --> 00:16:13,309 are actually flat, 435 00:16:13,669 --> 00:16:16,169 and all that kind of wonderful stuff. 436 00:16:16,539 --> 00:16:16,739 OK, 437 00:16:16,840 --> 00:16:18,940 what else do we need to know about this? 438 00:16:19,219 --> 00:16:20,489 We need to know that 439 00:16:20,780 --> 00:16:23,090 there are some symbols on here that 440 00:16:23,239 --> 00:16:24,570 need to be described. 441 00:16:24,859 --> 00:16:25,020 OK. 442 00:16:25,130 --> 00:16:26,659 This is a complex one, 443 00:16:26,700 --> 00:16:27,299 for example, 444 00:16:27,390 --> 00:16:28,020 OK? 445 00:16:28,179 --> 00:16:29,950 This means that there are 6 446 00:16:31,250 --> 00:16:36,549 features that have a diameter of 1.44, 447 00:16:36,960 --> 00:16:38,760 see if we can think about what that is, 448 00:16:39,049 --> 00:16:39,650 there's 1, 449 00:16:39,849 --> 00:16:40,640 there's 2, 450 00:16:40,729 --> 00:16:41,479 there's 3, 451 00:16:41,530 --> 00:16:42,210 there's 4, 452 00:16:42,349 --> 00:16:42,960 there's 5, 453 00:16:42,969 --> 00:16:44,039 and there's 6. 454 00:16:44,330 --> 00:16:46,109 How do I know that those are the ones? 455 00:16:46,530 --> 00:16:48,320 Because when you come over here and you look at this, 456 00:16:49,010 --> 00:16:51,080 all 6 of those look similar. 457 00:16:51,729 --> 00:16:51,900 OK, 458 00:16:51,929 --> 00:16:55,210 I got to get back to sketching and not erasing 459 00:16:55,489 --> 00:16:55,890 that one, 460 00:16:55,969 --> 00:16:56,440 that one, 461 00:16:56,570 --> 00:16:57,090 that one, 462 00:16:57,250 --> 00:16:57,830 that one, 463 00:16:57,849 --> 00:16:59,690 and that one and that one. 464 00:17:00,239 --> 00:17:02,830 All appear similar. And in this 465 00:17:03,520 --> 00:17:06,670 drawing image they also all appear similar 466 00:17:07,040 --> 00:17:10,209 and the fact that there's a dimension that says 6X 467 00:17:10,560 --> 00:17:11,329 means 468 00:17:11,800 --> 00:17:12,630 that they are. 469 00:17:12,959 --> 00:17:15,108 Now what does this symbol here mean? 470 00:17:15,560 --> 00:17:18,329 This means that there is a hole, 471 00:17:18,880 --> 00:17:20,300 and it's pointing to a hole, 472 00:17:20,520 --> 00:17:20,739 OK, 473 00:17:20,800 --> 00:17:22,750 you can see it pointing right there to that hole. 474 00:17:23,000 --> 00:17:24,510 This hole that's right here 475 00:17:25,239 --> 00:17:25,989 is 476 00:17:26,329 --> 00:17:29,089 5.68 millimeters deep. 477 00:17:30,119 --> 00:17:30,390 Now, 478 00:17:30,439 --> 00:17:34,069 if we couple that together with what we saw in the cross-section, 479 00:17:34,760 --> 00:17:36,229 we can actually see that hole, 480 00:17:36,359 --> 00:17:37,229 it's right there. 481 00:17:38,060 --> 00:17:38,260 OK, 482 00:17:38,270 --> 00:17:40,569 it goes all the way down right there and it 483 00:17:40,859 --> 00:17:42,849 is in line with this. 484 00:17:43,180 --> 00:17:46,020 And so, we know actually that we've interpreted that 485 00:17:46,500 --> 00:17:47,209 correctly. 486 00:17:47,459 --> 00:17:49,369 Let's see if there's anything else in here that's 487 00:17:49,540 --> 00:17:52,089 interesting to talk about right now 488 00:17:52,500 --> 00:17:53,410 other than 489 00:17:53,900 --> 00:17:56,030 the stuff we have already talked about. 490 00:17:56,300 --> 00:17:57,890 I think this is a good one right here. 491 00:17:57,939 --> 00:17:59,500 Let's take a look at this for a minute. 492 00:18:01,069 --> 00:18:03,420 Maybe this drawing has more than one that will help us, 493 00:18:03,469 --> 00:18:03,670 OK, 494 00:18:03,790 --> 00:18:04,390 this is good. 495 00:18:05,150 --> 00:18:07,310 There are two things going on on this drawing that 496 00:18:07,310 --> 00:18:09,709 are on this view that are worth thinking about. 497 00:18:10,069 --> 00:18:11,900 One is the fact that sometimes 498 00:18:12,109 --> 00:18:13,459 8X is used 499 00:18:13,910 --> 00:18:16,280 and sometimes a thing called typical is used. 500 00:18:16,349 --> 00:18:17,819 'TYP' means typical. 501 00:18:18,229 --> 00:18:18,349 Well, 502 00:18:18,430 --> 00:18:20,260 we already know the 8X version of this. 503 00:18:20,329 --> 00:18:22,469 It means that there's 8 radii 504 00:18:23,300 --> 00:18:24,800 of the same exact 505 00:18:25,099 --> 00:18:25,890 size, 506 00:18:26,300 --> 00:18:29,410 and they should be easily pick out a ball 507 00:18:29,819 --> 00:18:30,770 in this drawing. 508 00:18:30,979 --> 00:18:31,420 There's 1, 509 00:18:31,459 --> 00:18:31,819 there's 2, 510 00:18:31,939 --> 00:18:32,339 there's 3, 511 00:18:32,420 --> 00:18:32,780 there's 4, 512 00:18:32,859 --> 00:18:33,260 there's 5, 513 00:18:33,339 --> 00:18:33,699 there's 6, 514 00:18:33,780 --> 00:18:34,180 there's 7, 515 00:18:34,260 --> 00:18:34,969 there's 8. 516 00:18:35,260 --> 00:18:38,530 All 8 of those are 1.3. 517 00:18:39,020 --> 00:18:40,140 But over here, 518 00:18:41,130 --> 00:18:42,849 we have something different going on, 519 00:18:42,920 --> 00:18:43,430 OK? 520 00:18:43,709 --> 00:18:44,849 We don't have 521 00:18:45,219 --> 00:18:47,890 a certain number, 522 00:18:48,180 --> 00:18:48,380 you know, 523 00:18:48,500 --> 00:18:52,420 like 12X or something in front of this 1.00. 524 00:18:52,500 --> 00:18:55,410 We instead just have 1.00 typical. 525 00:18:55,800 --> 00:18:56,969 Why is that the case? 526 00:18:57,339 --> 00:18:57,540 Well, 527 00:18:57,699 --> 00:18:59,170 if we take a look at this guy, 528 00:18:59,500 --> 00:18:59,579 OK, 529 00:18:59,660 --> 00:19:02,530 and let's go erase some of this stuff that I had on here earlier. 530 00:19:03,219 --> 00:19:03,300 OK, 531 00:19:03,339 --> 00:19:04,260 if we look at this guy, 532 00:19:04,380 --> 00:19:05,939 I'm gonna turn this one to blue for a minute. 533 00:19:06,400 --> 00:19:13,270 I've got 1-2-3-4-5-6-7-8-9- 534 00:19:13,280 --> 00:19:14,359 10-11- 535 00:19:14,369 --> 00:19:15,430 12, 536 00:19:15,959 --> 00:19:17,619 but then I also have 537 00:19:18,300 --> 00:19:19,349 this one in red 538 00:19:19,640 --> 00:19:21,150 13-14- 539 00:19:21,160 --> 00:19:22,550 15-16- 540 00:19:22,560 --> 00:19:23,640 17-18- 541 00:19:23,650 --> 00:19:24,989 19-20. 542 00:19:25,400 --> 00:19:29,800 20 geometric features that have a dimension of 1, 543 00:19:30,359 --> 00:19:32,949 just in this particular part of the image. 544 00:19:33,420 --> 00:19:35,910 And so, the way that that's dealt with is not 545 00:19:36,199 --> 00:19:36,939 to say, 546 00:19:37,160 --> 00:19:37,239 well, 547 00:19:37,280 --> 00:19:38,079 what number did I say? 548 00:19:38,119 --> 00:19:38,400 I don't know, 549 00:19:38,439 --> 00:19:39,540 is it 16. 550 00:19:40,130 --> 00:19:40,160 No, 551 00:19:40,199 --> 00:19:41,150 it was 20. 552 00:19:41,869 --> 00:19:43,550 It's not to do this. 553 00:19:45,800 --> 00:19:46,709 But instead, 554 00:19:46,880 --> 00:19:50,050 it's to say 1.00 TYP. 555 00:19:50,939 --> 00:19:54,219 Because it's more obvious that that's what's going on 556 00:19:54,579 --> 00:19:55,699 in this area. 557 00:19:57,670 --> 00:19:58,319 OK, 558 00:19:58,589 --> 00:19:59,459 erasing those. 559 00:20:00,410 --> 00:20:00,430 All right, 560 00:20:01,119 --> 00:20:01,329 what 561 00:20:01,400 --> 00:20:03,000 else do we need to talk about? 562 00:20:03,160 --> 00:20:05,790 It's important to know that circles 563 00:20:06,199 --> 00:20:08,189 will always be designated 564 00:20:09,079 --> 00:20:12,910 by the standards as a diameter and arcs, 565 00:20:13,239 --> 00:20:14,339 not complete circles, 566 00:20:14,369 --> 00:20:16,680 will always be designated by a radius. 567 00:20:17,459 --> 00:20:20,469 It's also important to know that in engineering drawings, 568 00:20:20,479 --> 00:20:21,949 according to the standards, 569 00:20:22,319 --> 00:20:27,300 circles will only be dimensioned where they look like a circle. 570 00:20:27,630 --> 00:20:28,739 So, if I had a shaft, 571 00:20:28,750 --> 00:20:29,219 for example, 572 00:20:29,349 --> 00:20:30,540 that looked like this, 573 00:20:31,189 --> 00:20:33,819 and I had an engineering drawing that looked like this, 574 00:20:34,869 --> 00:20:37,540 I would dimension this one 575 00:20:37,910 --> 00:20:39,020 in this view, 576 00:20:40,209 --> 00:20:40,660 not 577 00:20:40,790 --> 00:20:41,589 like this. 578 00:20:42,849 --> 00:20:43,150 OK, 579 00:20:43,270 --> 00:20:45,459 this one is diameter something. 580 00:20:45,709 --> 00:20:46,979 This is no good. 581 00:20:47,270 --> 00:20:50,500 And the reason why I'm telling you that is because as you look for information, 582 00:20:50,750 --> 00:20:52,020 you want to make sure 583 00:20:52,270 --> 00:20:53,479 that you 584 00:20:53,869 --> 00:20:54,420 are 585 00:20:54,680 --> 00:20:55,939 looking in the right spot. 586 00:20:56,030 --> 00:20:58,069 So, if you're looking for the dimension of a circle, 587 00:20:58,150 --> 00:20:59,979 look where it actually appears 588 00:21:00,349 --> 00:21:00,810 like 589 00:21:01,069 --> 00:21:01,859 a circle. 590 00:21:02,270 --> 00:21:02,739 OK, 591 00:21:02,859 --> 00:21:05,430 a few things I want to just go over here for a second. 592 00:21:06,969 --> 00:21:10,569 As you're trying to extract out the information from these drawings, 593 00:21:10,790 --> 00:21:12,560 (let me just zoom out here for a second). 594 00:21:15,010 --> 00:21:16,280 We want to start 595 00:21:16,609 --> 00:21:21,640 by getting an overall view of the drawing by just scanning through it, 596 00:21:22,349 --> 00:21:24,020 understanding what images are there, 597 00:21:24,290 --> 00:21:26,280 trying to absorb a little bit of stuff, 598 00:21:26,449 --> 00:21:26,839 OK? 599 00:21:27,209 --> 00:21:28,979 We want to take a look at the title block, 600 00:21:29,130 --> 00:21:30,920 see what information is given there. 601 00:21:31,209 --> 00:21:33,000 We definitely want to read the notes, 602 00:21:33,489 --> 00:21:33,920 OK? 603 00:21:34,410 --> 00:21:37,920 And then we want to start getting the top level information 604 00:21:38,160 --> 00:21:39,270 that will help us 605 00:21:39,609 --> 00:21:42,719 to start building out the geometry. 606 00:21:43,089 --> 00:21:43,569 OK. 607 00:21:45,079 --> 00:21:45,279 While 608 00:21:45,279 --> 00:21:46,229 you're doing this, 609 00:21:46,359 --> 00:21:49,680 you want to learn to look for clues 610 00:21:50,239 --> 00:21:51,500 in the drawing, 611 00:21:51,520 --> 00:21:53,880 and I don't mean this from an educational perspective. 612 00:21:53,920 --> 00:21:56,109 I just mean that there are certain things like 613 00:21:56,599 --> 00:21:59,479 general wall thickness that's going to tell you 614 00:21:59,479 --> 00:22:01,270 there's going to be a shell somewhere, 615 00:22:01,560 --> 00:22:02,040 right? 616 00:22:02,280 --> 00:22:02,829 Or 617 00:22:03,170 --> 00:22:04,219 there are 618 00:22:04,520 --> 00:22:08,969 things like these virtual sharps that we saw here that mean that 619 00:22:09,319 --> 00:22:14,030 really we're trying to give a dimension before a radius would occur in a CAD model, 620 00:22:14,280 --> 00:22:14,400 right, 621 00:22:14,410 --> 00:22:16,829 or before a radius occurred in a manufacturing 622 00:22:17,310 --> 00:22:17,719 step. 623 00:22:18,609 --> 00:22:18,920 Also, 624 00:22:19,910 --> 00:22:19,985 we 625 00:22:19,985 --> 00:22:21,390 want to take a look at the cross-sections. 626 00:22:21,689 --> 00:22:24,439 We want to know that the cross-sections are there to help us 627 00:22:24,729 --> 00:22:26,959 and we want to really try to absorb the cross 628 00:22:26,959 --> 00:22:30,170 sections and understand what's going on with the cross-sections. 629 00:22:30,329 --> 00:22:32,800 Then we want to do our best to soak in the details 630 00:22:33,089 --> 00:22:34,619 of the detail view, 631 00:22:34,930 --> 00:22:35,170 right? 632 00:22:35,290 --> 00:22:36,760 What is this telling us? 633 00:22:36,810 --> 00:22:38,760 This is an interesting one right here, 634 00:22:38,969 --> 00:22:39,219 OK? 635 00:22:39,489 --> 00:22:39,859 Because 636 00:22:40,489 --> 00:22:41,439 this line 637 00:22:41,930 --> 00:22:43,140 and this line 638 00:22:43,619 --> 00:22:47,719 are parallel to each other and this line and this line are parallel to each other. 639 00:22:48,010 --> 00:22:49,479 This is interesting because 640 00:22:49,969 --> 00:22:51,979 there are other ways 641 00:22:52,369 --> 00:22:53,199 to 642 00:22:53,609 --> 00:22:55,280 have measured this. 643 00:22:55,479 --> 00:22:55,489 Yeah, 644 00:22:55,500 --> 00:22:56,800 we did this one and this one, 645 00:22:56,979 --> 00:22:57,329 OK? 646 00:22:58,239 --> 00:23:00,109 We could have measured like this, 647 00:23:00,280 --> 00:23:02,790 and these give us two different numbers actually, 648 00:23:03,040 --> 00:23:05,949 and this is something that can cause trouble in this particular 649 00:23:06,359 --> 00:23:06,930 model. 650 00:23:07,680 --> 00:23:08,439 So, 651 00:23:09,390 --> 00:23:09,510 understand 652 00:23:09,510 --> 00:23:10,229 what 653 00:23:10,520 --> 00:23:12,469 these things are telling you, 654 00:23:12,719 --> 00:23:13,239 OK? 655 00:23:13,680 --> 00:23:14,469 Also, 656 00:23:16,079 --> 00:23:16,175 most 657 00:23:16,175 --> 00:23:16,839 important, 658 00:23:16,920 --> 00:23:20,650 I think as you're looking through these engineering drawings is just to realize 659 00:23:21,020 --> 00:23:22,829 that the information is there. 660 00:23:23,199 --> 00:23:25,709 You don't need all of it at once. 661 00:23:26,060 --> 00:23:28,390 You need to use your CAD strategy 662 00:23:28,719 --> 00:23:31,839 to help you know just what bit you need, 663 00:23:32,199 --> 00:23:35,150 what feature you want to create so that you can get into this 664 00:23:35,510 --> 00:23:38,050 set of drawings and go find the essential 665 00:23:38,439 --> 00:23:39,430 dimensions 666 00:23:39,680 --> 00:23:41,359 that will help you get it. 667 00:23:41,959 --> 00:23:43,849 So, I'm coming back now to 668 00:23:44,130 --> 00:23:46,449 just sort of end of this and say that it 669 00:23:46,449 --> 00:23:49,849 is indeed really hard to read these engineering drawings. 670 00:23:50,010 --> 00:23:52,439 It is a foreign language in my view 671 00:23:52,650 --> 00:23:53,760 and it takes practice. 672 00:23:53,810 --> 00:23:54,650 It takes 673 00:23:55,010 --> 00:23:55,780 patience 674 00:23:56,130 --> 00:23:57,719 and it takes a willingness 675 00:23:58,130 --> 00:24:00,040 to actually read them, 676 00:24:00,329 --> 00:24:01,680 and to try to 677 00:24:02,130 --> 00:24:05,420 see what they're telling you, and to envision the geometry 678 00:24:05,689 --> 00:24:07,040 that's being described. 679 00:24:07,329 --> 00:24:08,410 And as you do that, 680 00:24:08,959 --> 00:24:10,579 your mind will be able to 681 00:24:10,880 --> 00:24:12,719 notice certain dimensions, 682 00:24:13,599 --> 00:24:14,689 certain features, 683 00:24:14,959 --> 00:24:15,800 certain patterns, 684 00:24:15,880 --> 00:24:16,790 certain other things 685 00:24:17,040 --> 00:24:17,869 that will help you 686 00:24:18,160 --> 00:24:20,270 during the CAD modeling process.