Re: 4th Axis Issue - Basic Rotary Table
I'm a little late the the game here, but I had a similar experience when I powered my rotary table. It started out life as a 6 inch Vertex Super Spacer. It was tight and the stepper would barely drive it in one direction, but the other direction was pretty good.
What I found is that the worm shaft was binding against the thrust surfaces, just steel against cast iron. Installing ball thrust bearings on either end of the worm shaft completely solved the problem.
Jim Dawson
Sandy, Oregon, USA