3d problem

I'm trying to create a 3d drawing which has a circular pipe that is straight for a distance the bends along a gentle radius. Ive tried tabsurf, rulesurf, revsurf, edgesurf without sucess.
how do i do this in R14? do I need a lisp add in ? where do I get that from ? how do I install it?
thanks in advance for your help.

trevor,
as long as the cross section of pipe in question does not change at any time during the curve simple use the torus entity. match the radii, and, essentially, align the two shapes with tangent snapping, this will enable smooth and flawes transistions.
i don't know how much you know about 3d, but the last time i did that (3 years ago) it requires extensive use of modifying the UCS coords for a particular task [one of the major set backs in modeling with autocad]
hope this helps. post again if need more ass!
rockon remember, its not work, its autocad!
adam
  Quoted Text Here  
straight
rulesurf,

trevor hinchliffe wrote:
  Quoted Text Here  
You can extrude a circle, using the pipe centerline as the path.