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One thing is certain. we'll never create a drawing by simply free picking points on screen. If we want to draft accurately, we'll need to know how to use Object Snaps. Object Snaps allow us to lock on the specific coordinates on our geometry. Before we get started, take a look at my status bar. Notice the only Mode settings that I am running are Grid and Dynamic Input. If you are going to work along with me, make sure that your Mode settings match mine. On my screen, I have two rows of geometry: this row above represents finished shapes and the row beneath represents incomplete line work.
Our goal in this lesson is to take the geometry that we see below and complete it such that it looks like the geometry we see above. I am going to pan the drawing over a little bit and we'll zoom in on this left side and we'll start with the rectangular shape. To finish this shape, I am going to use the Line command. So, I'll move up and launch Line and then I would like to start my line from the end point of this line. Now, I know that end point has a coordinate and I could wave around here and try and figure out what that is, but you know what, that wouldn't be very accurate.
Instead, I am going to use an Object Snap. I am going to hold my Shift key and right click, this brings up the Object Snap menu and we can use this menu to lock on to specific coordinates. I am going to select end point and then I'll click on this line segment. Notice how AutoCAD is locked on to that endpoint. To finish my line, I'll hold my Shift key and right click. I'll select Endpoint from the menu and I'll click on this line segment and then I'll hit Escape to exit the command.
To finish the shape, I'll hit my Spacebar to go back into the Line command. I'll Shift+right-click to bring up the menu and I'll select Endpoint. Let me mention this. AutoCAD will select the endpoint closest to your cursor. You don't have to be all the way on the endpoint to select it. As long as you are 50% of the way or greater along your line segment, AutoCAD will find the appropriate endpoint. So, if I click right here, AutoCAD snaps to that location. To finish my line, I'll Shift+right- click to bring up the menu, I'll select Endpoint and I'll click on this segment and hit Escape.
That is the Endpoint object snap. I am going to zoom out a little bit. we'll pan this over and to complete this drawing, we'll need the Circle command. So I'll move up and launch Circle. I would like to start my circle from the mid-point of this line. So I am going to Shift+right-click, I'll select Midpoint from the menu and then I'll click on this segment. Notice the icon for Midpoint is different than the icon that we see for Endpoint. Now, as I pull this out, I don't know what the radius of this circle is, but you know what, it doesn't matter.
I know that the radius goes out to the Shift+right-click> Endpoint of this line. Let's pan this over a little bit. To finish this drawing, I am going to launch the Line command. I would like to create my line from the Shift+ right-Click>Intersection of these two lines. I am going to click right at that intersection and then I'll Shift+right-click, I'll select Intersection from the menu and I'll click this intersection and I'll hit Escape. Then, I'll launch the Circle command and I would like to place the center of my circle at the intersection of this line segment and this one.
Unfortunately, I don't have a hard intersection that I can click on, but you know what, the Object Snap will still work. If I Shift+right-click, I'll select Intersection, and then I'll click on this segment and I'll move over and click on this segment and AutoCAD finds their extended intersection. Finally, the radius of this circle can be defined by the Shift+right-click>Endpoint of this line. Let's pan this over. This time we are going to look at the Center object snap.
To complete this drawing, I am going to launch the Line command and I'd like to create my line from the Shift+ right-click, I'll select Center. When you are grabbing a center point, think of your cursor as being AutoCAD's eye. If I place my eye on the arc, notice AutoCAD finds the center. if I click, AutoCAD will snap to that coordinate. I would like to draw this line to the Shift+right-click>Center, I'll click on this arc, and then I'll hit Escape to exit the command. It looks like we'll have to mix up a few Object Snaps to finish this drawing.
I am going to launch my Circle command and I'd like to create the circle from the Midpoint of this line and I'll like to draw it to the Intersection, right here. Let's pan this over a little further. This time we are going to look at the Quadrant object snap. I am going to select this circle momentarily. Take a look at these blue squares. These guys represent the quadrant locations on the circle. You can find the Quadrant object snaps at the North, South, East, and West locations of an arc or circle.
I am going to hit Escape to deselect this. I'll launch my Line command and I would like to create my line from the Shift+right-click, I'll select Quadrant, and I'll click the arc. Notice that AutoCAD will find the quadrant closest to your cursor. I am going to click right here. I'd like to draw this to the Quadrant here, to the Quadrant here, to the Quadrant here.
Let's go to the center point now. I'll select Center. I'll click on the arc to find the center location and then I am going to right-click and select Close to finish the drawing. Let's pan this over a little further. This time we are going to look at the Perpendicular object snap. I am going to launch my Line command and I'd like to start my line from the Midpoint of this line and I would like to draw that to the Shift+right-click>Perpendicular, and then I'll select this segment.
Notice, I can click any place I like along this segment and AutoCAD will find the perpendicular location. Perpendicular means I am creating a 90 degree angle. Now, perpendicular also works in reverse. I am going to hit the Spacebar to go back into the Line command. I'll Shift+right-click and select Perpendicular and then I'll click this line segment first. Notice, as I pull away, I am creating a line segment that is perpendicular from that original entity. I would like to draw this line to the Shift+right-click>Midpoint of this line and I'll hit Escape.
Let's pan this over a little bit further and this time we'll look at the Tangent object snap. Tangent allows us to snap to a tangent point on an arc or circle and just a quick definition. If a straight segment is tangent to an arc, it intersects the arc at one and only one point. I am going to move up and launch the Line command and I'd like to start my line from the Shift+right-click>Tangent. I will click this arc and as I pull away, notice I hit the Rubber Band effect but AutoCAD is maintaining tangency with that arc.
I would like to draw this line to a point Shift+right-click>Tangent to this arc and I'll hit Escape. Let's hit the Spacebar to go back into the Line command. I would like to start my line from tangent to this arc to a point tangent to this one and I'll hit Escape. From this moment on, we will always use Object Snaps as we draw. Using Object Snaps is the only way to guarantee we're creating accurate geometry.
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