[Jizvonius]

Originally Posted by Max Lobovsky

What are "starts"? The number of threads? I thought the number of threads was equivalent to the number of teeth so more threads is less reduction (and i would assume more efficient)

If you look at the side of the worm, you should see the places where thread starts, that's a "start". The number of starts will change the gear ratio. i refer you to Paul's post.

Originally Posted by Paul Copioli

Remember, gear ratio for a worm gear is # of teeth on the gear divided by number of thread starts on the worm.