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Author Topic: UC-100 Motor Stalls. Direction changes. new PC  (Read 1793 times)

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UC-100 Motor Stalls. Direction changes. new PC
« on: August 15, 2016, 08:40:07 PM »
Hello,

Symptom / example: When jogging on more than one axis followed by a direction change. Travel in X+ Y+ then switch to travel Y- an axis will stall. This is at 100% jog rate. Motors set to 20 IPM acceleration has been set from anywhere from 1.5-20 IPM with the same result. Now if i turn down the jog percentage to 50% the problem is no longer present. Now i did observe when i jog at the low rate i see M3 take out the backlash. It does not stall. It also doesn't seem to stall while under control of g-code. It did stall under g-code but was resolved after some tweeking.

I have done a fair amount of searching with out an answer as of yet. My gut says its a setting i'm overlooking.

Granted i have changed fair amount at once. Any thoughts & advise would be helpful.
I'll keep looking in the mean time.

XML attached

New pc:
dell optiplex 790 3ghz 8gig ram.
UC-100
sherline stepper controller.

Thank you,
Craig

 
Re: UC-100 Motor Stalls. Direction changes. new PC
« Reply #1 on: August 19, 2016, 02:36:49 AM »
What are you using to jog, Keyboard, mouse, hot keys or a pendant? Being as all other Mach movement are ok it could be down to your method of activating the jog mode. This could be you problem

Offline ger21

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Re: UC-100 Motor Stalls. Direction changes. new PC
« Reply #2 on: August 19, 2016, 08:46:44 AM »
Sounds like your backlash comp settings.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: UC-100 Motor Stalls. Direction changes. new PC
« Reply #3 on: August 19, 2016, 01:24:52 PM »
jintthefish & Gerry,

i am using the keyboard arrows to jog. Possibly with the faster PC the UC100 it causes the stall to happen; being that it can process the changes sooner. Unlike the slower XP machine. I read where it's not advisable to have comp at 100%. I have also tried varing the comp percentage with no change.  The reason was likelihood to loose steps. Looks like i may just have to dial down the jog speed or just move in one direction at a time. Speed fixes some problems causes others. 

Thanks again
Re: UC-100 Motor Stalls. Direction changes. new PC
« Reply #4 on: August 19, 2016, 02:00:46 PM »
I've found that when jogging using the keyboard, changing directions on any given axis will result in that axis stopping or hesitating.  I just simply stop any jogging before changing directions (i.e. lift off of all keys and then press the keys for the new direction.)  Of course, I don't do much manual jogging when actually cutting parts so this may be an issue if that's what you're trying to do.

Stephen "Highspeed" Kruse

Offline ger21

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Re: UC-100 Motor Stalls. Direction changes. new PC
« Reply #5 on: August 19, 2016, 02:10:17 PM »
I think you may need to play with the Shuttle Acc. setting.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html