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Topics - anzacinexile

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SmoothStepper USB / Weird problem with one axis only
« on: April 17, 2017, 11:23:11 AM »
I hope that someone can shed some light on a peculiar problem I have with a new build CNC Mill.

First the details

Running ESS, plugin version ESS_Mach3_160630_u4f1b
CNC4PC C25S BOB
Mach3 version 3.043.062
Longs motors 34HS5435C-O2B2
DM860A motor drivers set with 5000 steps / rev
4 core CPU Windows 10 with 16GB of memory

The problem

After carefully setting up the system X and Y axis are working fine and are very accurate however, Z is causing me real problems. The motor is completely isolated from the machine so there are no mechanical issues. I have even swapped the complete drive chain Z for Y and the problem remains with Z so I know there’s no issues with the ESS, BOB, power supplies or ESS configuration.

The problem is Z will run flat out in both directions no problem. It will run feeds up to 500mm/min and 1000mm/min up to max speed without issues HOWEVER, between 600 and 900mm/min the motor stalls with a horrible scream.

As I said, the motor is on the bench and with swapping axis, the problem remains with the Z motor. The only other items which might have a bearing is that with very slow feeds (1mm/min up to 100mm/min) the motor sounds very rough. I even tried an experiment where I set an extremely slow motor acceleration and on ramping up to maximum speed, the motor seemed to go through very rough bands until it got to 100mm/min. From 100 to 500mm/min it smoothed out until it got to about 600mm/min and the motor promptly stalled and screamed until a commanded speed of about 1000mm/min whereupon it took off without any further issues up to maximum speed.

I’m beginning to suspect the motor (and yes, I have checked the wiring)

Thoughts would be appreciated.

Thanks

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