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

 

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

Sounds like your backlash comp settings.

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

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

I think you may need to play with the Shuttle Acc. setting.