Extrude problems Acad2K

[10Gallen]

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,
GAllen

 

[smcadman]

"not in an ortho plane"
Is it at a single inclined angle, or a compound? If it inclines in only one angle, first draw your pline parallel to "world", then after extruding you path, rotate it to the angle you want. By doing this, you don't have to make a plane perpendicular to your path's endpoint for extruding at some odd angle. If is a compound angle, meaning it inclines both in the "z" and the "y" plane, then extrude using a "3dpoly" for the extrusion path. Many times, I make it a little longer and make a line parallel to the world plane. Then after extruding, I simply slice the part I don't need off. Again, this is easier than making a plane that is 41 degrees in the "z", and 37 degrees in the "y" direction for example.

Flores

 

[IFRs]

You could try offsetting the polyoine that defines the pipe run the ID and OD of the pipe, then create two solids by revolution of the offset lines about the centerline, then subtract the inside from the outside.

 

[10Gallen]

Thanks for the replies. There seems to be a bit of a glitch in that the default option of [PATH] is not being selected, but there are no problems when I type PATH on selecting the object to extrude.
cheers,
GAllen

 

[RiBeneke]

The default in the extrude command is usually to specify an extrusion distance that is taken as normal to the circle or closed polyline being extruded. Typing P (for Path) is the alternative.
If your circle etc is not centred on and normal (square to) the end of the polyline difining your extrusion path, then AutoCAD repositions it before extruding. The help explains it in detail.

 

[pardal]

The path shall be a 3dpolyline .


Pardal