Extruding an object down a spiral path/AutoCAD 2002

I am trying to extrude a bolt thread profile down a spiraling path
with the correct pitch. I cannot seem to be able to create the path. I
have tried creating arcs and giving them an endpoint with a z
dimension but AutoCAD will not allow me to do so. What is the best way
to go about creating a spiral path in which to extrude the thread
profile? Please help....

 

HiHo;
At MSN Autocad users forum a answer in the R2000 section is as follows.
the procedure is very long, you probably have it, you start with a
rectangle the size of the bolt, draw three lines for the slope on the right
end of the rec. you draw the angle lines for the threads and then 60 degree
angles at the top and bottom of the slope lines, these are extended into
triangles that are "revolved" then "sliced" in half, the half is copied and
inverted on top of the other half then this is arrayed over the bolt shank,
the arrayed part is then substracted and you are left with threads, from
there you add a cylinder and bolt head to complete the bolt.

 

fotr extruding on any 3d-path witout twisting the profile ask me via
www.black-cad.de
regards
Jochen