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Author Topic: Mach4/Uc100 problem with jogging  (Read 1289 times)

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Mach4/Uc100 problem with jogging
« on: May 09, 2018, 08:59:53 AM »
My setup is Win10 HP Laptop, Mach4 Hobby, UC100, Vista Pendant,Sherline Lathe, Sherline Nexgen Mill

System does not jog correctly when backlash setting is non-zero in Mach.  This affects all axis.

Backlash adjustment is applied after each jog even though direction has not changed.  Sometimes, the stepper goes the wrong direction, and often the jog amount is wrong.  For instance a .01 jog may go .01, or may go something less.  This happens whether the jog was done from the pc jog button, or the pendant, so I believe the pendant is not the problem.

Smaller jog increments result in more erratic behavior, especially when the jog amount is less than the backlash setting (which in my case is set to .003".

When making successive jogs of .001, the movement is often .001, 0, .002, 0, .002, etc. 
When stepping by multiple gcodes, like g0 z .001, g0 z .002, g0 z .003 ..... the system seems to work correctly as shown by test indicator and visual observation.

UC100 is set to 25khz, but testing with 100khz had the same result.

Backlash should only be applied when changing directions.

System works correctly when driven by LinuxCNC so problem is not stepper malfunctions or the Sherline motor drivers.

Any ideas?




Re: Mach4/Uc100 problem with jogging
« Reply #1 on: May 09, 2018, 09:17:01 AM »
Hi,
I wasn't aware that the UC100 supported backlash. Backlash compensation is a controller enacted feature, not really Mach at all.

Craig
My wife left with my best friend...
     and I miss him!
Re: Mach4/Uc100 problem with jogging
« Reply #2 on: May 09, 2018, 09:31:48 AM »
Yes, it is advertised to support backlash compensation.  If it doesn't, I just wasted $300

Offline ger21

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Re: Mach4/Uc100 problem with jogging
« Reply #3 on: May 09, 2018, 09:41:22 AM »
Send an email to CNC Drive and ask them about it. They're the only ones that will be able to answer this.
Gerry

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Re: Mach4/Uc100 problem with jogging
« Reply #4 on: May 09, 2018, 09:45:50 AM »
Hi,
yes I agree with ger21, I can certainly find that the UC100 supports backlash compensation with Mach3 but cannot find anything
specific about Mach4.

Given that the UC100 Mach4 plugin is so new, probably less than a year, it would not surprise me that its not yet available.

Craig
My wife left with my best friend...
     and I miss him!

Offline ger21

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Re: Mach4/Uc100 problem with jogging
« Reply #5 on: May 09, 2018, 09:49:33 AM »
Quote
Yes, it is advertised to support backlash compensation.

Where? I've never seen a list of supported Mach4 functions for any of CNC Drives motion controllers.
Gerry

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

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Mach4/Uc100 problem with jogging
« Reply #6 on: May 09, 2018, 09:52:46 AM »
https://cnc4pc.com/uc100-usb-motion-controller.html

At top of page, it says it supports Mach4
Near bottom, it says it supports backlash compensation.

It certainly implies that it should work.

Offline ger21

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Re: Mach4/Uc100 problem with jogging
« Reply #7 on: May 09, 2018, 09:58:29 AM »
No, it doesn't imply that it should work.
It's listed under "Supported Mach3 functions".
Gerry

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

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Mach4/Uc100 problem with jogging
« Reply #8 on: May 09, 2018, 10:24:55 AM »
Hi,
yes I also interpreted that as a supported Mach3 function not necessarily Mach4.

Craig
My wife left with my best friend...
     and I miss him!
Re: Mach4/Uc100 problem with jogging
« Reply #9 on: May 09, 2018, 10:39:16 AM »
Well then why does it say it now supports Mach 4.
It does not say it partially supports Mach 4 or that it supports Mach 4 with exceptions.