1 00:00:07,000 --> 00:00:08,000 Right. 2 00:00:08,000 --> 00:00:13,000 So I want to talk a bit now about units and coordinates. 3 00:00:13,000 --> 00:00:18,000 And this is quite an important thing to kind of get your head around and understand. 4 00:00:19,000 --> 00:00:26,000 Like a lot of things in CAD, it can seem confusing to people at the start, but once you kind of get 5 00:00:26,000 --> 00:00:31,000 your head around it, especially if the coordinates you've always got and moving from CAD system to 6 00:00:31,000 --> 00:00:35,000 CAD system, it's going to work the same and you're just going to know instinctively what's happening, 7 00:00:35,000 --> 00:00:36,000 okay, and how it's working. 8 00:00:36,000 --> 00:00:43,000 So I'm going to presume everyone is starting with no experience whatsoever. 9 00:00:43,000 --> 00:00:49,000 Some of you, it may be obvious the first part of this, just bear with us. 10 00:00:49,000 --> 00:00:51,000 I want everyone to be at the same level. 11 00:00:51,000 --> 00:00:51,000 Okay. 12 00:00:51,000 --> 00:00:56,000 So we're going to start I'm going to pretend you've never seen you've never worked with any coordinates 13 00:00:56,000 --> 00:00:56,000 before. 14 00:00:56,000 --> 00:00:58,000 X and Y means nothing. 15 00:00:58,000 --> 00:01:00,000 And we're going to start from there. 16 00:01:00,000 --> 00:01:02,000 So let's have a look what we've got. 17 00:01:04,000 --> 00:01:06,000 Looking at our blank screen here. 18 00:01:06,000 --> 00:01:12,000 And the easiest way to explain this, if you look down in the bottom left, you will see there's this 19 00:01:12,000 --> 00:01:16,000 kind of right angle shape and it says X and Y. 20 00:01:16,000 --> 00:01:16,000 Okay? 21 00:01:17,000 --> 00:01:21,000 And AutoCAD uses the x, y, coordinate system, X, Y, Z, actually. 22 00:01:21,000 --> 00:01:24,000 But let's not let's forget the Z for now. 23 00:01:24,000 --> 00:01:30,000 So it uses the X and Y coordinate system for 2D drawing, which is what we're interested in at the moment. 24 00:01:31,000 --> 00:01:41,000 And what that means is any if we draw a line, any kind of distance in this direction or this direction 25 00:01:41,000 --> 00:01:46,000 along this kind of axis here is measured in X. 26 00:01:48,000 --> 00:01:53,000 And Appiah and Appiah is measured in why okay now. 27 00:01:54,000 --> 00:01:57,000 People might think y, x, y, y, not millimeters inches. 28 00:01:57,000 --> 00:02:00,000 Well, the truth is, nobody knows what you're going to use. 29 00:02:00,000 --> 00:02:05,000 You might be joining inches, you might be joining millimeters, you might be joining anything. 30 00:02:05,000 --> 00:02:10,000 So it needs a kind of universal way of describing it. 31 00:02:10,000 --> 00:02:13,000 And it uses these x y coordinates. 32 00:02:13,000 --> 00:02:17,000 So X is this direction and Y is that direction. 33 00:02:17,000 --> 00:02:24,000 So if we were to draw a let me delete this. 34 00:02:27,000 --> 00:02:37,000 So if we were to draw a line and I'm going to make this 1000 okay and zero degrees and we have that 35 00:02:37,000 --> 00:02:44,000 line there, this line is actually it's a thousand long, it's actually a thousand in the X direction. 36 00:02:44,000 --> 00:02:45,000 Okay. 37 00:02:45,000 --> 00:02:53,000 So from this point, we've moved 1000 units in the X direction and zero units up. 38 00:02:53,000 --> 00:03:01,000 So if you were to write this down as a coordinate, you would write 1000 comma zero, okay? 39 00:03:01,000 --> 00:03:03,000 And the comma splits up the X and y y. 40 00:03:03,000 --> 00:03:04,000 So. 41 00:03:06,000 --> 00:03:09,000 So I've just I've just drawn up this just to demonstrate. 42 00:03:09,000 --> 00:03:16,000 So if you imagine we have our x ray line running this way and our Y line running that way. 43 00:03:16,000 --> 00:03:17,000 Okay. 44 00:03:17,000 --> 00:03:18,000 And let me just mark those. 45 00:03:18,000 --> 00:03:22,000 Don't again, don't you don't need to be following along here. 46 00:03:22,000 --> 00:03:25,000 I'd rather you just watched and actually grasped it. 47 00:03:25,000 --> 00:03:26,000 What's happening? 48 00:03:33,000 --> 00:03:39,000 Okay, so going this way is X and that way is Y, and as you move, you would go up in value. 49 00:03:39,000 --> 00:03:41,000 So there must be a zero point. 50 00:03:41,000 --> 00:03:42,000 Okay. 51 00:03:42,000 --> 00:03:44,000 And and this is known as zero zero. 52 00:03:44,000 --> 00:03:48,000 It's this symbol we had here down in the bottom left of your corner. 53 00:03:48,000 --> 00:03:50,000 It's where that starts. 54 00:03:50,000 --> 00:03:53,000 That is your zero zero of your drawing. 55 00:03:53,000 --> 00:03:55,000 It's called the origin point. 56 00:03:55,000 --> 00:03:58,000 And it's kind of the origin of your your whole model. 57 00:03:59,000 --> 00:04:00,000 The 00.. 58 00:04:00,000 --> 00:04:05,000 So if we were to create a rectangle from zero zero and I'm just going to snap to that. 59 00:04:05,000 --> 00:04:14,000 So this is now from zero zero and this rectangle was let's say it's. 60 00:04:17,000 --> 00:04:19,000 500 61 00:04:21,000 --> 00:04:22,000 by. 62 00:04:24,000 --> 00:04:25,000 400. 63 00:04:26,000 --> 00:04:32,000 Okay, then this point here, if I was to Mark. 64 00:04:34,000 --> 00:04:38,000 This point and write it as a coordinate. 65 00:04:42,000 --> 00:04:49,000 When that coordinate will be 500, comma, 400. 66 00:04:49,000 --> 00:04:49,000 Okay. 67 00:04:51,000 --> 00:04:54,000 So 500 comma, 400. 68 00:04:54,000 --> 00:05:00,000 And if you've ever worked with grid reference and mapping and it's exactly the same principle we have 69 00:05:00,000 --> 00:05:08,000 X, which is along this way and Y and everything, every point is specified as an X and Y from zero 70 00:05:08,000 --> 00:05:08,000 zero. 71 00:05:09,000 --> 00:05:10,000 Okay. 72 00:05:11,000 --> 00:05:20,000 Now, what about if we were to do the same thing, 500 by 400 down here? 73 00:05:20,000 --> 00:05:27,000 Okay, Well, this is zero zero As we move up in this direction, it's plus and this direction, it's 74 00:05:27,000 --> 00:05:28,000 plus it's positive numbers. 75 00:05:28,000 --> 00:05:32,000 But as we move either this way or that way, it's minus. 76 00:05:32,000 --> 00:05:37,000 Okay, So this coordinate down here. 77 00:05:44,000 --> 00:05:46,000 Let's get rid of this would be known. 78 00:05:46,000 --> 00:05:51,000 Well, it's -500 and -400. 79 00:05:53,000 --> 00:05:57,000 Okay, so that's how that coordinate would be expressed. 80 00:05:57,000 --> 00:06:04,000 So this way you get into negative numbers and you might get mixtures of the two. 81 00:06:04,000 --> 00:06:15,000 So if we were to go 300, 200 and draw that there and you might have guessed, but this one would be 82 00:06:16,000 --> 00:06:19,000 so it would be a negative number in this direction. 83 00:06:20,000 --> 00:06:23,000 So it'll be minus, what was it, 300. 84 00:06:23,000 --> 00:06:24,000 But in this direction, we're going up. 85 00:06:24,000 --> 00:06:28,000 So that would be a positive 200. 86 00:06:28,000 --> 00:06:28,000 Okay. 87 00:06:28,000 --> 00:06:32,000 So from 00X direction. 88 00:06:33,000 --> 00:06:37,000 Y direction X always expressed first. 89 00:06:37,000 --> 00:06:39,000 So you know which way that was. 90 00:06:39,000 --> 00:06:44,000 You always know which way that rectangle is going to be because it's always x first minus is down and 91 00:06:44,000 --> 00:06:47,000 to the left and positive numbers are up and to the right. 92 00:06:47,000 --> 00:06:49,000 And that's that's it. 93 00:06:49,000 --> 00:06:51,000 That's a coordinate system. 94 00:06:51,000 --> 00:06:51,000 Okay. 95 00:06:51,000 --> 00:06:55,000 Now if you don't quite get it, you might watch that again. 96 00:06:55,000 --> 00:07:00,000 But what I will say, the best way to learn a lot of these subjects is by using them. 97 00:07:00,000 --> 00:07:06,000 So if you kind of follow along as we're creating things and putting in figures, you'll get it. 98 00:07:06,000 --> 00:07:09,000 And once you get it, you never forget this stuff. 99 00:07:09,000 --> 00:07:10,000 It's like riding a bike, okay? 100 00:07:11,000 --> 00:07:14,000 And if you move on to other CAD systems, this is going to come in handy. 101 00:07:14,000 --> 00:07:21,000 Now, the only thing to bear in mind is we don't actually you've heard of me talking in units and saying, 102 00:07:21,000 --> 00:07:22,000 this is 500 units. 103 00:07:22,000 --> 00:07:22,000 This is. 104 00:07:23,000 --> 00:07:27,000 We're going to be drawing in either millimeters or inches in most cases. 105 00:07:28,000 --> 00:07:28,000 Okay. 106 00:07:29,000 --> 00:07:34,000 But you do need to tell AutoCAD that obviously your drawing is going to look very different. 107 00:07:34,000 --> 00:07:40,000 Your building, your component is going to be very different depending whether it's in inches or millimeters. 108 00:07:40,000 --> 00:07:40,000 Okay. 109 00:07:40,000 --> 00:07:47,000 So you need to tell AutoCAD that unless you do, AutoCAD will just work in what it calls units. 110 00:07:47,000 --> 00:07:48,000 Okay? 111 00:07:49,000 --> 00:07:54,000 So you can change that by typing in units. 112 00:07:54,000 --> 00:07:55,000 Simple as that. 113 00:07:55,000 --> 00:07:58,000 And it will come up with this box and this is where you can set. 114 00:07:58,000 --> 00:08:00,000 So you need to do this. 115 00:08:00,000 --> 00:08:03,000 When you start a new drawing, make sure you're working in the correct units. 116 00:08:04,000 --> 00:08:05,000 At the moment it's set to inches. 117 00:08:05,000 --> 00:08:12,000 So when I have been offsetting these 500 by 400, 1000 by zero, that is all inches. 118 00:08:13,000 --> 00:08:14,000 Okay. 119 00:08:15,000 --> 00:08:19,000 So if it was millimeters, it would be millimeters. 120 00:08:21,000 --> 00:08:28,000 Okay, now I'm going to delete that because that's from an earlier example. 121 00:08:28,000 --> 00:08:40,000 It's not actually the correct size, but if I was to draw that again, I'm going to do is 500 by 400. 122 00:08:40,000 --> 00:08:41,000 Okay. 123 00:08:44,000 --> 00:08:49,000 So you may have seen this box that keeps popping up here and thinking, well, I haven't got that. 124 00:08:49,000 --> 00:08:51,000 Or maybe it's appeared on your drawing, you don't know where from. 125 00:08:51,000 --> 00:08:54,000 It will come up and it will go all the time. 126 00:08:54,000 --> 00:08:56,000 And it's your properties box. 127 00:08:56,000 --> 00:09:02,000 You do use it a lot in AutoCAD and you can bring that up by clicking any object, right? 128 00:09:02,000 --> 00:09:08,000 Clicking and going to properties and it gives you a whole load of information, most of which you won't 129 00:09:08,000 --> 00:09:10,000 understand yet, but. 130 00:09:11,000 --> 00:09:12,000 It gives you. 131 00:09:12,000 --> 00:09:13,000 It does give you the coordinates. 132 00:09:13,000 --> 00:09:14,000 Okay. 133 00:09:14,000 --> 00:09:16,000 The thing is, something like a rectangle. 134 00:09:16,000 --> 00:09:17,000 It has multiple points. 135 00:09:17,000 --> 00:09:23,000 So what I like to do is just create a simple circle snap to the point you want to measure. 136 00:09:23,000 --> 00:09:26,000 And if you click that circle, you can have the center coordinates. 137 00:09:26,000 --> 00:09:29,000 So you can see the center of this is 500. 138 00:09:30,000 --> 00:09:34,000 By 400 K, which makes sense because that's how we drew it. 139 00:09:34,000 --> 00:09:36,000 And if we snap. 140 00:09:36,000 --> 00:09:37,000 If we put one here. 141 00:09:39,000 --> 00:09:42,000 The coordinates of this is -500 by -400. 142 00:09:43,000 --> 00:09:43,000 Okay. 143 00:09:44,000 --> 00:09:48,000 And if we type in units, we're set to millimeters. 144 00:09:48,000 --> 00:09:52,000 So this box is 500 by 400mm. 145 00:09:55,000 --> 00:10:00,000 So when you're creating things, everything will have its own set of coordinates. 146 00:10:00,000 --> 00:10:04,000 And it depends how you're modeling and how you're creating, whether you really need to know them. 147 00:10:04,000 --> 00:10:06,000 Sometimes you'll work with them a lot. 148 00:10:06,000 --> 00:10:13,000 So if you're doing something like surveying where a surveyor is giving you points, maybe you're creating 149 00:10:13,000 --> 00:10:18,000 an architectural layout or landscaping plan, you'll be getting survey points in from a surveyor maybe 150 00:10:18,000 --> 00:10:21,000 saying this is where you know, lampposts are or fences. 151 00:10:21,000 --> 00:10:25,000 We've been out and we've surveyed these and these are the coordinates. 152 00:10:25,000 --> 00:10:27,000 And in that case, it's really important. 153 00:10:27,000 --> 00:10:31,000 And you can just take those coordinates and you can type them in and you can plot things where they 154 00:10:31,000 --> 00:10:32,000 actually are. 155 00:10:34,000 --> 00:10:40,000 Um, in other times, things like mechanical components of map coordinates you will use more in terms 156 00:10:40,000 --> 00:10:46,000 of when you're actually creating an object, a bit like we do when we draw a rectangle. 157 00:10:46,000 --> 00:10:46,000 So. 158 00:10:48,000 --> 00:10:55,000 When we create the size and it's 500 by 300 or whatever, that's that's the kind of way you will use 159 00:10:55,000 --> 00:10:56,000 coordinates in that situation. 160 00:10:57,000 --> 00:11:06,000 The main thing to remember is X always is reference first, which is that way, and the y coordinate 161 00:11:06,000 --> 00:11:07,000 is that way if ever you forget. 162 00:11:08,000 --> 00:11:10,000 If I just close this properties box. 163 00:11:13,000 --> 00:11:13,000 Virus. 164 00:11:14,000 --> 00:11:15,000 We're actually on it, so you can't see it. 165 00:11:15,000 --> 00:11:19,000 But this little icon here will always be at the zero zero Origin. 166 00:11:19,000 --> 00:11:19,000 Okay. 167 00:11:19,000 --> 00:11:22,000 So the main thing to remember is X is in that direction. 168 00:11:22,000 --> 00:11:28,000 Y is up there, which you can check by looking at this and that your origin is zero zero. 169 00:11:29,000 --> 00:11:30,000 And that's about it for now. 170 00:11:30,000 --> 00:11:33,000 That's all you need to know to follow along later on. 171 00:11:33,000 --> 00:11:38,000 If you're getting to 3D, you'll be introduced to another coordinate, which is Z, and that really 172 00:11:38,000 --> 00:11:39,000 is a height value. 173 00:11:39,000 --> 00:11:46,000 So if you imagine looking down on this, if you draw a line from kind of the end of your nose to this 174 00:11:46,000 --> 00:11:48,000 blue square, that would be the Z axis. 175 00:11:48,000 --> 00:11:49,000 Okay? 176 00:11:49,000 --> 00:11:54,000 But you really wouldn't worry yourself with that now until you get well used to working with these coordinates 177 00:11:54,000 --> 00:11:55,000 here. 178 00:11:55,000 --> 00:11:56,000 So. 179 00:11:56,000 --> 00:12:00,000 Yeah, so you know about coordinates now basically, you know about units, you know, to set your units, 180 00:12:00,000 --> 00:12:07,000 whether you're working in inches or millimeters and you know that X is always referenced first in AutoCAD.