Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Craig1 on August 15, 2016, 08:40:07 PM
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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
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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
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Sounds like your backlash comp settings.
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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
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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
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I think you may need to play with the Shuttle Acc. setting.