Q: A CNC milling machine with GSK 218M control, move 0.5mm on XYZ MPG pendant, but the machine moves 15mm, what happened?

A: It is gear ration issue, change the gear ration on XYZ driver will solve the problem.

GSK218M Specification:

http://www.cncmakers.com/cnc/controllers/CNC_Controller_System/GSK218M.html