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Extruding and sweeping the abacus

From: Up and Running with 3D in AutoCAD 2013

Video: Extruding and sweeping the abacus

In this video, you will extrude the abacus which will ultimately become the top most portion of the column and then you will sweep a profile creating a transition between the abacus and the volutes, open the column 3 project file and go into the top view by clicking on the view cube Rotate the plan if necessary, and zoom into the sketch. This is the abacus this top square object, and then this is the transition between the abacus and the volutes below.

Extruding and sweeping the abacus

In this video, you will extrude the abacus which will ultimately become the top most portion of the column and then you will sweep a profile creating a transition between the abacus and the volutes, open the column 3 project file and go into the top view by clicking on the view cube Rotate the plan if necessary, and zoom into the sketch. This is the abacus this top square object, and then this is the transition between the abacus and the volutes below.

Go to the Layers panel, open the Layer Drop Down, turn off layer 1 and set layer 3 current. Then draw a rectangle, starting over here at this corner point. Then hold down shift and right-click and choose nearest snap to a point that's on this central axis point about like this to represent this half-portion of the abacus.

Then draw a temporary line down from the mid-point, and then orbit by holding down shift and dragging the mouse wheel, so that you can be sure of where you're snapping in 3D. Click a point here that's perpendicular to the yellow volute surface and press enter. Next turn off Layer 2, and turn off the image, go back into the top view and rotate the view. Okay, so right here we have a line, and everything here is on the same plane. Draw a circle from the end of the line up here.

It's also the mid-point of the rectangle, and snap it to the mid-point of the line, like this. Then draw another circle in much the same way, down below. Draw another temporary line across the circle from its left quadrant point across like that. Then trim, type TR, enter, and click these different portions of the circles to trim them away. In the end, you want to be left with two arcs, like that. This represents this transiton between the abacus and the volutes below. Move it over, some distance such that you have a gap here. And then erase the temporary lines.

Orbit And the next thing we need to do is mirror this rectangle over to the other side. So type MI Enter, select the rectangle, Enter. Select the end of this central axis. Move the cursor over with Ortho on, click Enter. So now we have a representation of the entire abacus. Now, I'd like the abacus to be a square, because it's going to sit on top of this round column. One way you can draw a square is with the polygon tool, and it works in the XY plane.

So I'd like to draw a square but not in the current XY place. So before I go ahead and draw that, I'm going to rotate the user coordinate center, type UCS > Enter, and then type X > Enter. And press Enter again to accept the default rotation angle of 90 degrees. Now, the XY plane is on this surface here. You can look at the cursor and see the green and the red lines, that represents the XY plane. Now, we can use the polygon tool, type four, enter, and then use its edge option click right here, and right over here, to draw the square along that edge. The next thing we need to do is rotate this profile curve 45 degrees, type RO Enter, select Both arcs, Enter.

Click this end point and type 45 Enter. So now it's in the correct orientation to represent a mitered joint. But this particular profile curve, is going to b e down. The same distance it is from the corner. So to represent that, let's go ahead and offset this existing rectangle here. I'm going to type O for offset, Enter. Zoom in, set the offset distance graphically by clicking these two points here and here.

Select this object to offset, and then click inside and press Enter. So now we have two rectangles. Next, move these two arcs from this end point down to this end point. So now that's looking good. I think we're ready to create our three dimensional objects. These are separate arcs. So before we use them as a profile, it would make sense to join them together. Type Join, Enter select them both, press Enter.

Go to the Surface tab, because this is an open object. When we sweep it, it will generate a surface. Click Sweep, select the Profile > Enter. Use the Alignment Option, it says, the line sweep object perpendicular to path before sweep. No, we already rotated it. It's in the right position right now, then click the Sweet Path, which is this inner rectangle and the surface is generated.

Next go to the Solid tab, and choose Extrude. Select the larger rectangle, Enter. And then snap to this end point to create this abacus. Now let's see how this relates to the other geometry in the model. Go to the Home Tab, open the Layers panel, open the Layer Drop Down and turn on layers 2 and layers 1, click Outside and Orbit. You can see that the green objects are too low. They need to move up a bit in order to be centered on the volutes and the bas-relief objects.

So, let's move them. Type M Enter, make a window to select those green objects, enter. Grab them from the midpoint right here. We get warned that one of the surfaces associated with this, is not selected, so I'll click Continue. We didn't select the Arcs which define the sweep curve, but that's okay. Now, I want to move this up, and I want to snap it in the y direction to this end point here on these white lines.

But if I click right here, it's just going to move them over there. And that's not what I want. So I'm going to type in a point filter 0.XZ, because I want to specify those two coordinates by clicking the cursor. So, press enter and then click back at the same midpoint where you started to specify the X and Z coordinates. And then it says, need Y, click on this endpoint to specify just the Y coordinate.

And now the green objects have moved up, and everything looks great. In this lesson, you swept a surface and extruded a solid while manipulating the user coordinate system in order to create the objects where they were needed. You also used a point filter to specify a transformation in a specific direction.

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Up and Running with 3D in AutoCAD 2013

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