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Topics - vonnieda

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Hi all, I am having some trouble with backlash compensation (BLC) and was wondering if anyone had seen this issue. The short version is that if I turn on BLC and try to move in more than one axis at > 15 IPM one of the axes will seize up. The exact same movements with BLC off work fine. I made these two videos that show the issue pretty well:

BLC OFF: http://www.youtube.com/watch?v=vrF1-n6oWqU

BLC ON: http://www.youtube.com/watch?v=PMa6wtscvog

I found this line in the manual "Mach3 is not able to fully honor the axis acceleration parameters when compensating for backlash,
so stepper systems will generally have to be detuned to avoid risk of lost steps." and that sounds dangerously like what I am seeing. Can someone explain this further, and is there any way around it?

I've tried exact stop mode but that didn't seem to make any difference.

A few other things: The mill is a Taig 2018. I am using Gecko 201 drives with 258 oz steppers. The controller is a custom job by Dan Mauch of Camtronics and has a 36v power supply rated for 20 amps. The drives are set to about 3.5 - 4.0 amps. I've checked voltages on the power supply and the 5v computer bus. The 36v is solid and does not dip during hard use. The 5v is coming from the USB port and is 5.02v and looks solid. I'm running the current version of Mach 3 as of today; upgraded this morning and it didn't solve anything.

Any ideas?

Thanks,
Jason von Nieda

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