Just found out something interesting.  I have two laser systems, both use the Xulifeng-Mach3-USB-Motion-Card.  They work fine with Backlash Compensation enabled or not.  So, it has boiled down to the MK3 interface board and/or its drivers.  I have contacted the company to see if there are updated drivers for the board.  Otherwise I will get another Xulifeng board for my mill, as the other two are totally bulletproof and have had no problems with them at all. 

Will keep you posted on what happens. 

Pete

Step and Direction are both 0 on each axis. 

Doesn't that mean the step and dir signals are going nowhere? Shouldn't they be assigned to some pins so they go out to the motor drivers?

Cheers
Roger

Roger, don't know what those numbers in Step pulse and Direction Pulse do in the motor tuning window.  Mill has been running fine all along, so signals are getting to where they need to.  Except with backlash compensation enabled, at least on this interface board.  

Pete

Ah - misunderstanding! I thought you were referring to Ports&Pins.
Dir pulse width does not apply/matter. Ignore.
Step - well, should not matter, but try setting it to 1 or 2, just for LOLs?
Otherwise - geez, I dunno.

Cheers

Its been a few days and finally have the mill running with backlash compensation enabled.  Ended up being the plugin for the interface card was incorrect.  Took four or five tries with Automation Technologies tech support to get one that works.  But got it running today.  I now have to study up and see about running with exact stop or constant velocity and the pros and cons of each. 

All in all the fix for this backlash compensation enabled deal was getting the correct driver.