| How to make a Spiral, Thread or Screw Thread
First, use an AutoLISP routine such as the attached, spiral.lsp to create the spiral path you need. Then use the EXTRUDE command with a reference object, selecting the spiral as the path.
You can also accomplish this with Mechanical Desktop (MDT) or AutoSurf by using the augmented lines approach. Create a sweep surface using augmented lines as the path. In MDT, use the SURFCUT command to create the solid.
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