Acad2K extrude problems

Hi all,
I am having some difficulty in drawing simple pipe runs in 3D. I have no
experience with 3D, but have nutted out some slab layouts etc, but have the
following problem:

If I draw pipe CL, if it is not in an ortho plane then the extrusion of a
circular face does not follow the path, but follows what appears to be the
projection of the CL onto the ortho plane. I have tried setting UCS to the
object, namely the pipe CL, then rotating around the appropriate axis to get
Z in the right direction, but the result is the same.
I see that extruding a face along a path may do the trick, but I cannot get
the circle which represents the end of the pipe to be recognised as a face /
solid area.
Any suggestions as to where I'm going wrong?
The drawings are just simple representations for visualisation purposes.
Cheers,

 

Hi,

You are obviously doing something wrong, but it is hard to tell what
exactly. If the pipe just a strait one than you don't need to extrude a
circle along a CL. If the pipe has bends and turns and so on than your
best shot is to get TUBEX.lsp, which draws a pipe along a set of lines.
Anyway, since you are in Australia we could sort the problem over the
phone. Some times it is a faster way than writing a whole set of
instructions. I am in WA, where about are you?

Igor.