To amplify a little, there are three ways to build '3D' object in AutoCAD. In
the order they were included in the software:
- Build an object an edge at a time, jointing lines to make a 3D 'wireframe'.
It doesn't behave like a solid. You can't put a hole in it.
- Take a 3D wireframe and add surfaces, primarily with 'revsurf' and 'tabsurf'.
Again, the result does not behave like a solid, and you can't put a hole in
- Build a solid 3D model by extruding a closed polyline, or using a command
like 'box'. You can make a hole in that, but the method may be
counterintuitive. One way, assuming you want to put a hole in a box: Construct
a circle, and extrude it to make a cylindrical solid. If you have located the
circle and its UCS properly, and extruded it far enough in the right direction,
it will go through the box. You can then 'subtract' the cylinder from the box,
leaving a box with a hole in it. It helps to start thinking like a machinist,
i.e., constructing a drill in order to make a hole, by subtracting the drill
from the workpiece. If the drill is contained entirely within the solid, you
can subtract it, but it will be hard to see.
I suggest that you
without the quotes. That prevents AutoCAD from destroying the primitives as it
builds the solid. That makes it much easier to go back and try something over.