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The first tool you’ll try is the Move tool. The Move tool moves the surface of a solid.
1. Open the Solided it . This file is set up with the Hidden Shade mode turned on so you can see the form more easily. .
2. Click the Move Faces tool in the Solids Editing toolbar, then click the back edge of the model, as shown in Figure 18.29. Notice that two surfaces are highlighted. These are the faces that will be moved unless you indicate otherwise. To isolate the back surface, you will remove the top surface from the selection set.
3. At the Select faces or [Undo/Remove/ALL]: prompt, type R.J. The prompt changes to read Remove faces or [Undo/Add/ALL]:. Now any highlighted object you select will be removed from the selection set.
4. Click the edge of the top surface, as indicated. The top surface is removed from the selection set.
5. Press .J to finish your selection.
6. At the Speci fy a base poi nt or di sp] acement: prompt, click any point near the back face.
7. At the Specify a second poi nt of di sp l acement: prompt, enter to move the ‘Surface 0.6 units to the right.

Once you’ve selected the surface you want to move, the Move Faces tool acts just like the Move command. Notice how the curved side of the model extends its curve to meet the new location of the surface. This shows you that AutoCAD  to maintain the geometry of the model when you make changes to the faces.
Try Move Faces again, but this time, move a set of faces on the interior of the model.
1. Click the Move Faces tool again.
2. Click the countersink hole closest to the foreground, Then click the straight shaft of the whole,.
3. Press .J to finish your selection, then click any point on the screen.
4. [email protected]<90.J. The hole moves 1 unit in the y-axis.

In some instances, AutoCAD will not be able to move surfaces. This usually occurs when an adjoining surface is too complex.

Offsetting a Surface

Now suppose you want to decrease the radius of the arc in the right comer of the model,and you also want to thicken the model by the same amount as the decrease in the arc radius. To do this, you can use the Offset Faces tool.

1. Click the Offset Faces tool on the Solids Editing toolbar.
z. Click the lower edge of the curved surface,  the curved surface and the bottom of the model are highlighted. You can add or remove surfaces from the selection set as you did in the previous two exercises. Here, you’ll just stick with the selection set you have.
3. Press 1 to finish your selection, then at the Specify the offset distance: prompt, enter .5..1. The surfaces move to their new location.

Deleting a Surface

Now suppose you’ve decided to eliminate the curved part of the model altogether. You can delete a surface using the Delete Faces tool.

1. Click the Delete Faces tool on the Solids Editing toolbar.
2. At the Select faces or [Undo/Remove]: prompt, click the bottom edge of the curve as you did in the last exercise. You’ll need to remove the bottom surface from the selection set, otherwise this operation won’t work.
3. Type R.J and then select the back edge of the bottom surface to remove it from the selection set. The curved surface remains highlighted.
4. Type .J to finish your selection. The curve disappears and a comer forms in its place,

When you attempt to delete surfaces, keep in mind that the surface you delete must be recoverable by other surfaces in the model. For example, you cannot remove the top surface of a cube expecting it to turn into a pyramid. That would require the sides to change their orientation, which is not allowed in this operation. You can, on the other hand, remove the top of a box with tapered sides. Then, when you remove the top, the sides converge to form a pyramid.

Rotating a Surface

All of the surfaces of the model are parallel or perpendicular to each other. Imagine that your design requires two sides to be LItan angle. You can change the angle of a surface using the Rotate Faces tool.

1. Click the Rotate Faces tool on the Solids Editing toolbar.
2. At the Select faces 0r [Undo/Remove]: prompt, select the comer edge in the foreground, as shown in Figure 18.34, then press .J. The two surfaces facing you are highlighted.
3. At the Specify an axis point or [Axis by object View/ Xaxis/Yaxis/Zaxt 5] <Zpoints>: prompt, use the Endpoint Osnap to select the bottom of the comer, as shown in Figure 18.34. .
4. At the Speci fy the second poi nt on the rotat ion ax; 5: prompt, use the Endpoint Osnap to select the top of the comer . The two points you just selected specify the axis of rotation for the surface rotation.
5. At the Specify a rotati on angl e or [Reference]: prompt, enter 4.J. The two surfaces change their orientation,

Tapering Surfaces

In an earlier exercise, you saw how to create a new tapered solid using the Extrude command. But what if you want to taper an existing solid? Here’s what you can do to taper an existing 3D solid.

1. Choose the Taper Faces tool from the Solids Editing toolbar.
2.. Click the three comers of the model, as indicated You may have to approximate the location of the back comer to select it.
3. Press …I to finish your selection.
4. At the Speci fy the base pot nt: prompt, use the Endpoint Osnap to click the bottom comer in the foreground of the model,.
5.,. At the Specfy another poi nt along the ax; s of taper; ng: prompt, use the Endpoint Osnap to click the top comer.
6. At the Specify the taper angl e: prompt, enter 4.1. The sides of the model are now tapered 4 degrees inward at the top


Extruding a Surface

You used the Extrude Faces command to create two of the solids in the Bracket model. The Extrude command requires a closed polygon as a basis for the extrusion. The Solids Editing toolbar offers the Extrude Faces tool that will extrude a surface of an existing solid. The following exercise demonstrates how it works.

1. Click the Extrude Faces tool on the Solids Editing toolbar
2. Click the bottom edge of the front surface of the model.
3. You don’t want to extrude the bottom surface of the model so type R.J then click the back edge of the highlighted bottom surface,.
4. Press.J. The Spec; fy he; ght of extrus ion or [Path]: prompt appears. Notice that this is the same prompt you saw when you used the Extrude command earlier in this chapter.
5. Enter .S.J for an extrusion height of 0.5 units
6. AttheSpecify angle of taper for extrusion <0>: prompt, enter 45-1 to taper the extrusion at a 45° angle. Your model now adds the extrusion.

You can extrude multiple surfaces at one time if you need to by selecting more surfaces after step 2. In this exercise, you removed a selected surface in step 3 so that only one surface is extruded.

Other than those features, the Extrude Faces tool works just like the Extrude command.

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