Just Another Rotary Setup Question

[TechBravoTN (Brian Bell)]

This may be of some help:

Thunder Laser - Chuck Rotary with Lightburn - HELP

Hi - I have a Nova35 Thunder Laser. I use Lightburn. We are trying to setup our chuck rotary attachment. What should the steps per rotation be ? Does this ever change ? We set our circumference of our object which was a tumbler cup with a 4" circumference. At 12,000 the design was stretched too much. We set it to 8,000 and it came out perfect. We then put a 3" tumbler in to engrave, set the circumference to 76.2mm, using 8,000 still and the design was stretched again. I am confused.