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In this movie we're going to continue talking about editing sketch geometry. But this time we're going to focus on the Trim, Extend and Split commands. I'll start a new part by clicking the New button on the toolbar, selecting standard.itp on the template and clicking Create We'll begin by creating a new sketch. We'll select Create 2D Sketch and we'll select a plane to draw on from the origin geometry that's presented. We're now in the sketch environment and we're ready to begin sketching. Now, I'm going to go ahead and create a very basic shape.
I'm going to right-click in the Graphics window and select the Line tool. And I'm going to lock my geometry to the origin point of the sketch by left-clicking to start my line. I'll create a horizontal line. And just follow arround, and the, the size doesn't matter here. We're really focused on the shape, so that we can show the Trim, and Extend, and Split commands. So I've gone through and made a very basic shape. If during my design process, I decide that I need to change this shape, I could delete geometry and recreate it.
Or, for example, if this design changed and we needed to remove this top section of the sketch, we could go to the Modify panel and use the Trim and Extend commands to help do that. I'm going to start by going to the Modify panel and using the Extend command. While in the Extend command, if you hover over geometry Inventor is going to automatically begin showing you a preview of the type of extend that's going to happen. You'll notice that it even happens if you hover over other items that aren't going to connect with that point.
So, I could make this a rectangle by clicking on this line and then clicking on this line. But in this case, since we want to remove the geometry at the top, I'm going to hover over this line here, the horizontal one and left-click. What Inventor has done is taken this single piece of geometry that had stopped at this end point and just extended it until it hit the next piece of geometry. Now, I could go back up to the toolbar, to the Modify panel, and select Trim, but while I'm still in this command because Trim and Extend are often used together you can right-click and just toggle between Extend, Trim and Split, all three.
So, in this case, I'm going to switch over to the Trim command and I can now select these lines and you'll see a dotted line showing where geometry's going to be removed. If I were to click on this line, we'd be back to where we started. We would have extended it out to the vertical line on the left and then removed it as well. But what I want to do here is trim this line. Essentially now, I have these two pieces of geometry that I can right-click and get out of that command by hitting Escape or Cancel. And then I can window those pieces of geometry and just hit Delete on my keyboard.
And I've converted this to the rectangle. The other item that we have not touched on yet is the Split command. The Split command comes in handy most often when you have overlapping profiles. Let me show you what I mean. If I draw another rectangle that overlaps, or perhaps I'll even draw a circle that overlaps here. I now have a stack of geometry that Inventor can evaluate as profiles when we go to create a 3D feature.
Let me finish this sketch and I'm going to right-click in the Graphics window and select Extrude. Now, the way Inventor works is it gives me the ability to select multiple profiles to Extrude. If I hover over this rectangle, you'll notice that I'm getting one full rectangle. Same with this one, same with the circle. Now, I've seen, if I want this overall shape to look this way, I can select each of these items and you'll see that I get all the full outline of that profile.
If I do that again, there's also other profiles here that we could potentially use. Because these lines overlap on these rectangles and of this circle, Inventor is not seeing an intersection point at these points where they overlap, because of the way we drew the geometry. The Split command can fix that. If we edit the sketch by double-clicking on the sketch in the browser, we can go up to the Modify panel and select Split. And, when we hover over any geometry, it's going to follow the geometry around until it hits another line and provide indicators shown here as right axis on where the line could be split.
By doing that, Inventor is going to use these points where the line is split to define different profiles. I'm going to go ahead and select the bottom of the circle and it doesn't matter if you pick the bottom or the top because you're going to get the same result. But I'm also going to go down here and select this line. And, I'm going to select this line, which means I now have, if I get out of this command by right-clicking and selecting OK, or you can right-click and select Cancel, or you can hit Escape on you keyboard. All three do the exact same thing. But now, if I hover over the geometry, you'll see that it's essentially broken this into multiple pieces of geometry.
And I can drag this, it's still connected, technically, it just has an intersection point that happens right here, and at the intersection of where the circle and the rectangles connect. And the reason I wanted to show that is now if I finish the sketch, right-click in the graphics window and select Extrude, you'll find that Inventor has split that up into multiple profiles and I could choose to do a series of pieces and leave certain ones out. In this case, it's not exactly what we want, but I just wanted to show how the overlapping of those profiles is a good place where Split might be used.
Once you know that you have that, it might change the way you design geometry or the way you sketch geometry, in order to speed up your design process.
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