>  im tring to draw 3d screw threads in acadr13 ...could someone give 
 > me some tips on how to do this.. i would think i would revolve a 
 > section of the thread around a 3d spiral but how do i draw a 3d spiral?
 This question comes up fairly often. If you really need a spiral, look for 
SPIRAL.LSP on you installation disk or hard drive. I think it was the first 
AutoLISP routine ever written, and it was included with R12. I have read the 
file, but never used it.
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