Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Craig1 on August 15, 2016, 08:40:07 PM

Title: UC-100 Motor Stalls. Direction changes. new PC
Post by: Craig1 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

 
Title: Re: UC-100 Motor Stalls. Direction changes. new PC
Post by: jimthefish 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
Title: Re: UC-100 Motor Stalls. Direction changes. new PC
Post by: ger21 on August 19, 2016, 08:46:44 AM
Sounds like your backlash comp settings.
Title: Re: UC-100 Motor Stalls. Direction changes. new PC
Post by: Craig1 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
Title: Re: UC-100 Motor Stalls. Direction changes. new PC
Post by: Highspeed1964 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
Title: Re: UC-100 Motor Stalls. Direction changes. new PC
Post by: ger21 on August 19, 2016, 02:10:17 PM
I think you may need to play with the Shuttle Acc. setting.