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So I'm going to start a new drawing again.

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Just click that tab and we're going to look at dimensions.

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I'm going to leave this property box up because we'll be using that if it's not on yours, don't worry.

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Okay.

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So.

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I'll show you how to get it back.

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But dimensions we have here, there's two main ways of creating a dimension.

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We have a button called dimension, which you would think is how you how you should do that.

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And we have this pull down menu here which gives you the different styles of dimension.

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Now, AutoCAD is quite intelligent.

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It can work out what type of dimension you need.

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In most cases, if you're clicking on a circle, it's going to know that you want a diameter or radius.

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Okay.

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If you're clicking on an angle, two lines that are at angles to each other, it's going to guess you

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want to measure the angle.

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So just using this dimension button, AutoCAD is going to try and guess what you want.

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But if if you want to actually specify it, you can just click on the type of dimension you want.

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And that's why there's two main ways of doing it.

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You can just use this one button, which is kind of, here's what I think you need or specify the type

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of dimension you want, and we'll have a look at doing that now.

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So I'm going to create a line I'm going to turn off on with F8 and I'm going to make it 100 units long.

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Okay, Right click one command.

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And here we go.

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So.

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If I'm just going to use this pull down command for now.

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And the simplest dimension of all is just a straight dimension, linear dimension.

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And this is going to ask you to pick the two points.

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So I want to pick the beginning and I've got snap on.

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I'm going to turn nearest off for this because it's going to interfere and get both end points.

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And now you can see it's as we move our cursor, it's got this dimension attached.

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So what it wants to know is where do you want to put it?

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Okay.

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And we need to left click again to show where we want it.

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Well, I want it there.

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And that's created our dimension.

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It doesn't look very good.

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There's a few things wrong with this.

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The text is too small.

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The arrow is too small in the chapter we did on leaders and text.

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It's basically how that came out.

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It's got a few issues.

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Okay.

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And.

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I can see what's happening.

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The scales are all wrong.

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A bit like with the hatching and the line type, you need to give it a scale.

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So as with anything else, I'm going to click on it right click properties to bring up our properties

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box.

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Okay.

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And now we can see we've got all our standard kind of layer colour, that kind of thing, but we've

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got a whole load of options here and we've got quite a few options under dimension.

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We've got all these boxes you can.

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You can pull down.

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Okay.

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Now, there's a lot of options.

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Most of them you'll never change.

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But there is a few you need to know about.

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So with a dimension, it's kind of separated into two parts.

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It's the lines and the arrows, which is vs and it's the text.

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Okay.

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You don't want them all.

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There is a dimension style.

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And the dimensions scale.

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Okay, like an overall style.

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But sometimes you want to control the text and the arrows different.

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You might want small arrows and larger text or big arrows and tiny text for whatever reason, but you

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do want separate control on both those items.

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So first off, let's look at lines and arrows and if we pull this down, we get all these options here.

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The main one, the main options are these top three, and that is what type of arrow do you want?

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Arrow one.

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So with a dimension, you've got two arrows, one on each end, you can have different styles.

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So.

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We're going to stick with this close field, which is what this is.

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And I'm going to set the scale and I'm going to set the scale at 2.5.

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See what that looks like?

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Okay, so that looks a bit better.

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So now we've got a decent size arrow.

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We can see when we change this, we could have closed blank.

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So now it's still an arrow.

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It's just not filled in.

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We could have a dot.

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And if you're depending what you're doing and what industry you're from, some of these are used more

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than others.

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Okay.

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One that's used a lot is oblique.

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So you just have a line, like a thick line like that between them.

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But you could have an arrow.

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And again, a lot of it is personal preference rather than industry.

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But you can have none.

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You can turn it off and this can come in handy when you just want an arrow on one end because you've

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got an option for each side.

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Okay, so you could have an arrow on that end and none on that end.

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Most of the time I'd say 99.9% of the time I want them both and I will use either close field or oblique.

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And a lot of what you're doing.

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CAD You're not creating new drawings all the time.

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You're editing drawings, you're opening someone else's drawing, even from a manufacturer or something,

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and you're editing it.

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So you might just change your dimension to match that one.

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Okay.

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And there's easy ways to do that, which we'll look at, but that's how you change the arrow.

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So we've looked at the arrow type and the arrow scale.

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The other things are just standard AutoCAD properties, the line weights.

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Um.

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Colors, line type, that kind of thing.

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You can change all those.

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Now, this is a dimension line and these lines that go down from the arrow to your object are the extension

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lines.

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You can see you want them to have a bit of a break.

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So it doesn't look like you don't want this to look like it's a line that does that.

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You want your dimension to have a bit of a break and you can set that.

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Generally, you want all these number values.

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Whatever you've chosen is a correct size for your arrow.

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You want to use the same for everything else which has these number values.

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So we'll change that to 2.5 and we'll change that to 2.5.

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And you can see now it's much more of a.

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You can tell it's a dimension and not part of the object.

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Okay, So that's the line.

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That's that's lines and arrows options.

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Next is the text option.

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And here standard text stuff.

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So we've got a text color.

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We're going to go with a 2.5 for the height.

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The offset is kind of where the lines are.

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So if we if we change that to 2.5 as well, you'll see it just gives you this opening.

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These are the position coordinates.

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Standard.

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So that's your font if you've loaded fonts and you can match them.

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Position.

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So maybe you want it above the line centered in the line you want it outside, which is the same, you

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want it below the line.

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You can change all that, the position horizontally.

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You might want it.

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At first extension line or second extension line over the first extension line over the.

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So you have all these options to change your dimension where it is.

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Okay.

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And that's under text.