2004

Create 3D Objects | 311
The 3D command creates a wedge shape defined by surfaces only.
Create an Extruded Solid
With
EXTRUDE, you can create solids by extruding (adding thickness to)
selected objects. You can extrude closed objects such as polylines, polygons,
rectangles, circles, ellipses, closed splines, donuts, and regions. You cannot
extrude 3D objects, objects contained within a block, polylines that have
crossing or intersecting segments, or polylines that are not closed. You can
extrude an object along a path, or you can specify a height value and a
tapered angle.
Use
EXTRUDE to create a solid from a common profile of an object, such as a
gear or sprocket.
EXTRUDE is particularly useful for objects that contain
fillets, chamfers, and other details that might otherwise be difficult to
reproduce except in a profile. If you create a profile using lines or arcs, use
the Join option of
PEDIT to convert them to a single polyline object or make
them into a region before you use
EXTRUDE.
Tapering the extrusion is useful specifically for parts that need their sides
defined along an angle, such as a mold used to create metal products in a
foundry. Avoid using extremely large tapered angles. If the angle is too large,
the profile can taper to a point before it reaches the specified height.
Create a Revolved Solid
With
REVOLVE, you can create a solid by revolving a closed object about the
X or Y axis of the current UCS, using a specified angle. You can also revolve
the object about a line, polyline, or two specified points. Similar to
EXTRUDE,
REVOLVE is useful for objects that contain fillets or other details that would
otherwise be difficult to reproduce in a common profile. If you create a pro-
file using lines or arcs that meet a polyline, use the
PEDIT Join option to
convert them to a single polyline object before you use
REVOLVE.
original object
extruded object
extruded and
tapered circle