In a CNC router I have I use the old MK2/4 with CNC USB Controller software [I don't plan to upgrade it's an old machine]


This machine has closed loop nema23 steppers, specifically 2HSS57 on both 3 axis.

While in a pocket, the unexpected happen, position was lost.

While in that pocket, I saw the machine doing spatial moves, instead of helixing it was doing something strange, like moving in straight lines.

Then position was lost (about 1 mm in both X and Y axis). The machine is fine, no backlash, no ballscrew problems no coupling problems.

The only thing that comes to mind, is maybe the motor settings in PlanetCNC are too aggresive and the closed loop motor drivers never got the pulses.

This is huge problem, today I lost 3 hours of work and the material.

Anybody with advice on what settings should I use with 2HSS57?

Currently all axis use same settings (metric):

Step Delay: 15?sec
Axeleration: 160
Steps/Unit: 160
Inital Speed: 0
Maximum Speed: 4000

Any ideas on what to look to understand what's causing the issue ?


- Petros