The Dreaded X axis stepper error using UC400ETH and UCCNC !!!

[dachopper]

Hi guys... Sooooooooo angry right now !!!!!!!!!!!!!

I just video'd the problem for the first time, it was a vertical travel move, with speed turned down to 50% of my tools recommended speed.

After 8 minutes, the tool lifted vertically while unloaded with a slow retract speed, and the Z height travel jammed for 1/2 a second just before getting to full retract height. then plunged into the part. on the next down shift. It wasn't accelerating, it was at travel speed when it jammed on nothing

The previous other error was not caused by the Z axis, as it was an X axis shift, that also must have had to jam and remain in mid air - and be unloaded for 3-4 seconds wile being sent an X command but remaining Dead still in the X axis, with the Z axis moving up making the tool cut vertically in mid air.

Current Peak is set to 3.5A with Pro tuner in the AM882

Stall detect will not function as my cut speeds are low while I try to figure out what is causing these issues

Motors are NEMA23 381oz/in 3.5A Single Shaft Stepper Motor KL23H2100-35-4A, 0.9 degree.

Power supply is PS-10N68 - 1000W 68V Power Supply running 4 of the above steppers, ( two of the motors would have been on 50% current hold ) when the other motor stalled also.

The final thing is that I tried as hard as I physically could to get the Z and X axis to jam, and i just physically cannot, even with the motors hot............ any ideas?

Remember, they both effectively jammed at travel speed, basically under no load, .... but y?