Draftsman Interview Question:

Explain how can you make a spring, spiral or screw thread?

Submitted by: Muhammad

To make a spiral or screw thread use an AutoLISP routine such as spiral.1sp, it will create a spiral path according to your need. Then you can use EXTRUDE command with a reference object, using the spiral as the path. Also, there is another way you can do this, by using Mechanical Desktop (MDT) or Autosurf by using augmented lines as path.
Submitted by: Muhammad