Can I extrude a plate with a hole?

I'm just starting out and would like to create a 3D model. To start
with, I've got a simple flat plate that I'd like to cut a circular
hole out of it.

When I extrude the 2D, the hole is filled in. Is there a way I can not
get the hole? Or is extrude the wrong way to go?

Thanks!
Norman

 

You have to extrude both the rectangle (creating the plate), and the circle
(creating a cylinder). Then use the SUBTRACT command to remove the cylinder
from the plate.

The rectangle must be a polyline or a region. You can't extrude lines and
arcs.

A useful variable to keep in mind: DELOBJ; when set to zero, acad will
retain the original objects that you extruded. When set to 1, they will be
deleted.

Also look up the boundary command. It will create a region or polyline from
a closed shape. Useful if you need to extrude a shape made up of lines and
arcs.

You can also use the box command to create the plate in one command (if it's
rectangular).

 

You have to extrude both the rectangle (creating the plate), and the
circle

cylinder

You can do the subtraction while they are still both regions (must convert
to region for booleans on 2d)(I'm pretty sure). A quick test with a simple
example shows no obvious difference in resultant mesh. If the extrusion is
complex, I'd be inclined to do the subtraction at the region stage, just for
"safety" (You never know). Suspect subtracting first is (unnoticably)
shorter time, also.

and

Is this any different than REGION? I don't think REGION will make a pline.

 

Thanks guys! More commands to learn...

Norman

 

Yeah, boundary is different from region. You answered your own question.

 

Yeah, boundary is different from region. You answered your own question.

Not hardly. The difference is far more than "REGION can't make plines."