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So one thing that's important to to know about and also to set up in your software at the start before

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you even start drawing anything.

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It's important you set up the units and you know the units you want to work with.

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So most people will know the type of units they want to work with, but you do need to set that up at

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the start.

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Otherwise, it can it can really mess things up.

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So the main two things and differences between the metric system and the imperial system in the US still

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use the imperial system feet and inches.

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Most other places use a metric system these days, but even then you need to kind of narrow down how

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you're going to work within those systems.

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So let's just have a look and and see exactly what I mean.

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So you may be working in metric system, but if you were to create a small, um, a component, say.

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Then you're probably going to be working in millimeters.

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Same if even if you do building layouts, a lot of these days, people will work in millimeters.

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In the UK, it tends to all be in millimeters until you get to the really big distances.

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I've seen people use centimeters a lot in Europe, but on the big layouts, if you were doing something

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like a site layout with lots of buildings and it was maybe a few miles wide, you probably wouldn't

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use millimeters.

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In that case you'd use meters.

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Okay, But you need to be aware of what you're using.

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You don't want to be putting dimensions on and measurements and not knowing what you're getting.

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If you're getting a measurement of 500, you need to know what that is because obviously 500mm is a

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big difference in 500m.

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And likewise in the US, if you're using feet and inches for a larger, say, a building layout, it

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may just be inches.

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Using for small components probably would be.

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So you might and you might be down to fractions of an inch.

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So whereas a building layout would be maybe ten feet six inches for a small component, you might be

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working in 30s of an inch.

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So you know, you might have a measurement that's two and ten 30s and then you're in fractions or sometimes

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it's in decimals of an inch.

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So instead of saying half an inch, it's 0.5.

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So even with inches, you can have different ways of expressing it decimal or fractional and it's important

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to know.

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What it is you want to use and to set that up right from the beginning.

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Now, generally you will know.

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In terms of working in metric or imperial, it probably is down to where you're based, although sometimes

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you could be based in Europe and working on a project in America or vice versa.

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And then you might be using a type of unit that's a bit more unfamiliar, but generally you'll know

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that at the start.

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So first thing you want to do is set those units and we'll have a look at doing that now.

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In AutoCAD.

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The basic measurement is just a unit.

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Okay.

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So this is something to kind of get your head around at the start.

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AutoCAD works in units.

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If you create something that's ten units long to AutoCAD, it is ten units long.

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Now.

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You could call that what you want.

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You could call it millimetres, you could call it inches, whatever.

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But it is still a unit.

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You're just saying to AutoCAD, okay, in this drawing, every unit represents one millimeter or every

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unit represents an inch.

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Okay, so let's have a look at changing those.

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So in AutoCAD, you can just type in units, press enter, and you will get the drawing unit setting

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box.

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So this box here, the first setting is architectural.

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Okay?

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And you'll see this is inches and it says inches here for the insertion scale.

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So content that's inserted in the drawing will be in inches and you can set your precision.

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So are you working down to a precision of half an inch, quarter of an inch, maybe 256 of an inch,

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which I'd say is very precise for an architectural drawing.

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You've also got decimals.

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So do you prefer to work in degrees minutes and seconds or just decimal degrees, 45 degrees?

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ET cetera.

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And again, how precise do you want to be with that?

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Now you can go decimal.

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So even in inches.

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You can be decimal.

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Okay.

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So if I.

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Okay that so if we were, let's say we were 10.5in.

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Okay, if I just click on the line here and left click, then I can drag this out and I can type in

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our length.

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So if I were to say 10.5 and then right click to enter, if I click this now, and if you haven't got

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this box, you can right click and go to properties, okay?

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And you'll see it says 11.

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So I drew this at 10.5, but it says it's 11.

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Well, let's have a look.

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We've got our precision set to zero if I did it to one decimal point.

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And now click on it.

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You can see it says 10.5.

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So by setting your default units, you can set.

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How many of these decimal places is going to come to?

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And sometimes you open a drawing because a lot of people don't change that precision setting.

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By the way, I don't know why, but sometimes you'll open a drawing and you put a dimension on and it

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comes out and it will come out at 10.50000.

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That's just because they haven't changed the units scale.

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Okay.

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So if you if you see that, it's easy to stop that happening every time just by changing the precision

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in the units box.

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Okay.

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So I'm going to leave that there.

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But we're on decimal and we're on inches.

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So that's how we would express inches.

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We can also go engineering.

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So let's look set to engineering.

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If we click this line again, you will see now it's 10.5 and it has the inches symbol.

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We've got our area in square inches, okay?

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Everything is actually denoted as being in inches rather than just a decimal.

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It's actually saying inches.

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We can go units again and we can go to oops, we can go to fractional.

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So under fractional this will be ten and a half and it actually says that the fraction a half.

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So sometimes when you're drawing and you have an old drawing, it might say it's so many sixteenths

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of an inch and you have to if you're in decimal, you go on your calculator and you work that out or

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you have a conversion sheet of what that is as a decimal.

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But you can, if you want, just have the unit set to this and you can you can draw that.

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So if it was.

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I'm going to say this is one.

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And 5/16 of an inch.

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So how you would write that is one and then do the dash.

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So it's one complete inch and then next is five and then do your um.

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Slash 16.

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Okay, so that is one and 5/16 of an inch.

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And now when you press enter, if we click on that.

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Okay.

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So what's happened now?

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It says one and a half.

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Why is that?

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It's supposed to be one and 5/16.

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Well, remember, we've got our precision set, so AutoCAD will always.

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We'll always kind of round things up because we've got our precision set to half an inch.

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That's how it's going to be.

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We we wrote 5/16, so we need to be on a precision of sixteenths.

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Okay.

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And now we will see.

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It says one and 5/16.

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So make sure your precision is set to to what you want to be.

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Usually in a drawing you will have a mixture, but if you just set it to your highest.

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Okay, So if you're if you have one dimension that's in 30s, just set it to that.

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But if we look now, if we look at this blue box, you'll see it's still saying the distance in inches.

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Even though we're going into feet because we're over 12, it's still calling it 51in.

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And that's where these other settings come in.

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So, for instance, let's type in units if I change it to architectural.

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Architectural, you're using bigger distances.

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If you think of architectural, think of working in feet because you're talking about building layouts.

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Now, if I was to draw a line in the blue box, you'll see it says three feet, and the way it's shown

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it is free.

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And then the foot sign, dash free space, half inch.

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So that is three feet and 3.5in.

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Okay.

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And you can see we've got a precision precision set on 16 by the look of it, because it is showing

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if we move it along, it's going into sixteenths fractions.

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And I can write.

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And if you wanted to type that in, you could put so let's say it wanted to be six feet.

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So we do our six feet sign and then we do five dash and I'm going to go seven slash 16.

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So that's how you would write that dimension and that would be six feet, five and 7/16 of an inch.

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Okay.

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You don't need your inch sign because it knows what you're working in.

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But if we look down here, that's how that's what we've got.

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So let's go back to units.

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So that's the difference really, between the architectural and the fractional.

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Here.

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It will keep it in inches.

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So it will say your total inches.

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However many feet it is, architecture will say your feet.

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Decimal as we've seen.

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We'll do so ten point.

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In fact, let's do more.

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Let's do 24.5.

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Okay.

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So that's 24.5in.

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And engineering.

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Is going to split it.

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So two feet, 0.5in.

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So you've got the whole option there.

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You've got total inches with no feet.

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You've got feet and inches as a fraction.

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You got feet and inches as a decimal and you've got total inches as a decimal.

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So that should cover you in terms of imperial for whatever you want to do.