I bought a kit from HobbyCNC a few years ago. I built it but never really tried to use it until now. I know it's their old design but it seems to work ok for the most. I'm using Zeus for the controls on a Pentium III. The problem I'm having is speed. When I try anythingabove 10ipm I start loosing steps. The motors came with the kit and are 7.4 v 1A 125in oz. For troubleshooting I have loosened the gibbs so there is no binding going on . The milling machine is small and I thought the 125in oz motors would be enough. At low speed they have plenty of power. I know that steppers basically loose power as their speed increases but 10ipm is hardly fast.
The power supply is 30v. I've read that steppers are usually run at 15 to 20 time the rated voltage. With the motors being 7.4 and the power supply at 30v that is only 4 times the rated voltage. Would lower voltage motors help?