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If you ask most AutoCAD users what their favorite command is, Undo is usually the answer. That's because we all make mistakes and when we do, the Undo command will let us put things back the way they were. In this lesson, we are going to learn how to use the Undo command. On my screen, I have a mechanical drawing. this line work represents a gasket and in order to demonstrate Undo, I first have to do something. So I am going to make a design change to this geometry. Currently, this geometry has two tabs and the tabs are skewed 15 degrees. Let's say, I would like these tabs to be in perfect alignment.
So I am going to rotate some of this geometry. I will move up and launch the Rotate command and I am going to select this line and this arc, this line, I'll select this circle and select the geometry for this slot and I'll select my center line. Then I'll right-click, I would like to rotate this geometry around the center of this circle and normally, I would rotate this 15 degrees to put these guys into a straight alignment. But remember, we are talking about Undo, so I am going to make a mistake. I am going to rotate this geometry 115 degrees and then I'll hit Enter and this is obviously wrong. That's alright.
I can fix it by using the Undo command. Undo is located here in the Quick Access toolbar. It looks like a backward facing arrow. Now, before I click this, notice there is also a forward facing arrow and it happens to be grade out right now. We will talk about this command in just a second. I am going to click Undo and notice that AutoCAD backs me up a single command. Also notice that the forward facing arrow is now available. This icon represents the Redo command. Redo will reverse the effect than Undo. If I click this, AutoCAD will put the geometry back to the previous position.
Now, I don't want to do this. So I am going to move up and click Undo one more time. Let me give you an important tip when using Redo. The Redo command can only follow an Undo. Notice, the icon is still available right here. But if I somewhat has panned my screen, I'll lose the ability to do a Redo. Alright, I would like to go ahead and make that design change again, except this time we will do it correctly. I'll launch my Rotate command and I will reselect this geometry and I'll right-click. I would like to rotate the geometry around the center of the circle and I would like to rotate it 15 degrees.
Now, at this point, since this is a straight line, l really don't need this to mention anymore. So I am going to erase it. I'll launch the Erase command, select the dimension and then I'll hit Enter. Now I have obviously got some gaps and I have got some overlapping line work. I am going to clean this up using Trim and Extend. I'll start by launching the Extend command and I'll select this line and this line as my boundary edges and I'll right-click and I will extend this arc and this arc and then I'll hit Esc. Then I'll move up and launch the Trim command. I will select this line and this line as my cutting edges and I'll right-click and I would like to trim off this arc and this one.
When I am finished, I'll hit Esc. Now, after making these changes, what if we were giving the direction to put this part back the way it was. Well, I can move up and click Undo, Undo, Undo, Undo to put this thing back or notice, there is a fly-out right next to the Undo icon. If click this, it brings up a menu that allows me to back up several commands in one step. Here is the trims that I just did, here's extends, Here's where I erased the dimension and here's where I rotated my geometry. I would like to take a way all of these commands all the way back through Rotate.
So I will select Rotate from the menu and notice my geometry is restored to the previous state. The Undo command is a lot like an insurance policy. No matter what we may do to our drawing, we can always restore our geometry by using the Undo command.
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