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Let's talk about the various relationships and how they can help us to sketch better. I have open a sketch on the top plane here with a rectangle with four holes in it. And it's a fully defined sketch and it is the correct size and the correct location. However, there's a lot of extra work here that we probably can save ourselves a lot of time. So let's point a few things out that probably, we could improve if we use some relationships instead of all these dimensions. Let's go ahead and count all the one inch dimensions. We've got, like, one, two, three, four, five, six, seven, eight, nine, ten, 11, 12 times we're using the same one inch dimension.
That's a lot. So general rule of thumb is if we use the same dimension more than once, it's too many times. So, let's go through here and see if we can replace some of these dimensions, with relationships to simplify the design. And now notice, these are all the same size hole. So instead of dimensioning all four of them, let's go ahead and delete these dimensions. One, two, and three. And let's leave one of those. You can leave any one of them. It doesn't matter. Let's choose the first one, hold in Ctrl, and let's pick all four of those circles. And since you let go of that, let's go ahead and choose, make Equal, or you can choose it from down here.
So, again, super, simplifying the design, by changing one of the dimensions, now changes all four. For instance, if I change this to 0.5, all the holes automatically change. If otherwise if I had them all individually dimensioned, if I changed one, I'd have to go ahead and change all four of them. And like most designs they change rapidly. So you don't have to go back and do four times as much work, when you can easily just change one and they'll all automatically update. It also makes it a lot simpler, when you're making changes and less chances of error. Let's go back and change that to one, 1.0. Okay. Next.
Let's take a look at all these other dimensions here. One, one, one, one, one, one, one. They're all the same dimension. Again, maybe we can use some center lines or some other reference geometry to help us out here. So, I'm going to come down here to the Center Line tool, and I make a line from the center point of this one over here to this center point of that one, to the center point of that one. And it's going to say, hey, you can't add that relationship. It's okay, because we're adding all these other lines, it's going to over define our sketch. So if you have that, it's okay, don't worry about it. Click OK. Now I can also go ahead and delete these other dimensions here. So let's go ahead and do that, so delete these.
One, two, three, in fact, I'm going to delete all of these dimensions because, I don't really want any of these dimensions interfering with my sketch. 'Kay? Then I'm going to continue my center line. Just connect the dots from the center point to center point. And then you can see that we've got a nice fully defined sketch. And notice, as I move one, they move them both. Now let's fully define the outside. But now these lines are now blue, so it means they're undefined. So we want to fully define them. So again, I'm going to add one more line. This one is going to be from the upper left hand corner to the lower right hand corner. And I'm going to say, that line, and I'm going to hold down Ctrl and choose the origin.
I'm going to say that's right in the middle, the midpoint. As soon as I do that, now whenever I drag this out, it automatically works as a team. I can move one and move the other ones. And then I can just add a couple dimensions, maybe from this line here, up to here. There's the one inch that way, and I can dimension this way, again one inch that way. As soon as I add those two dimensions with defining it from the outside edges to the top edge, both as one inch everything's defined. If then, later, I want to come back to my design. And say, well, actually that's only a half of an inch. I can change it and everything automatically updates.
So you're saving yourself, instead of eight dimensions, you only have two now. Change it back to one. Here we go. How about these dimensions here, the two, the four, the four, the eight? Let's get rid of all those. Delete, delete, delete, delete. Okay, we can use the same technique we used here with that center line across the middle. Grab the center line. Choose from one corner all the way up to the other one. Grab the origin of the part. Hold down Ctrl, choose the line. Let go of that. Choose Make Midpoint. Now it's defined around the midpoint, so I can drag things around and they all move as a team.
And then just add a couple of dimensions. 8.0, 4.0, and you can see our design is much simpler, it's centered around the origin. And it's very easy to update or change with much less chance for error.
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