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erratic motor motion
« on: November 12, 2017, 05:22:55 PM »
Been using Mach3 for a few years to run a CNC router.  The PC died a few day ago. Sourced a replacement, loaded it up with a fresh install of XP and Mach3.  Using a PCI parallel card, the same card as was in the earlier machine.  Had a back of the config file, loaded it into Mach3.  Took awhile to get the parallel address figured out and now all axis motors are moving.

However they move very "jerky".  https://vimeo.com/242486792.  The best setting I can find is to put the "kernel" speed at 25000, anything higher and it gets worse, to the point of clearly missing steps/stalling the motors.  When I run "driver test" it seems to be fine up to 60000.

Any thoughts on what to try?

Thanks, Rick

Offline ger21

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Re: erratic motor motion
« Reply #1 on: November 12, 2017, 05:55:17 PM »
Quote
When I run "driver test" it seems to be fine up to 60000.

Do you get a flat, smooth line with no spikes in Drivertest? How do you define "fine"?
Gerry

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

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: erratic motor motion
« Reply #2 on: November 12, 2017, 10:14:59 PM »
There are some spikes, I was just going by the "system excellent" message.

Here's a vid of the test - https://vimeo.com/242509419

Re: erratic motor motion
« Reply #3 on: November 12, 2017, 11:21:10 PM »
In the device manager, is your computer set up as Standard, or ACPI?   If the latter try changing it to Standard... that is what I did when I used to run my CNC from a laptop.

Marsha

Offline ger21

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Re: erratic motor motion
« Reply #4 on: November 13, 2017, 11:47:22 AM »
The "System Excellent" is a bit misleading, as you either get System Excellent, or failure.

I'd also recommend switching from ACPI to Standard. In some cases, it may require re-installing Windows.
Gerry

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

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: erratic motor motion
« Reply #5 on: November 13, 2017, 12:27:41 PM »
Thanks, will give that a shot.

Rick
Re: erratic motor motion
« Reply #6 on: November 14, 2017, 10:21:56 AM »
Switched from ACPI to "Standard", no change.  Uninstalled/reinstalled Mach3, no change.

Rick