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Feedrate override makes machine stutter
« on: September 29, 2015, 02:41:01 PM »
If I try to cut a circle (R65) with a 6mm endmill at 1500 mm/min there is no problem. I can run the same code at 6000mm with no problem.
BUT, if i run the code at 1500 mm/min and use feedrate override at 200% (F3000) it "stutters" (shakes) at the all the 90 degree point of the circle (where x and Y mixes).

The machine shows that it can handle 6000 mm+, could it be that its my computer having problems calculating and sending the pulsestream in the parallel port when using override?
Its not a very fast computer, but the mach 3 test tool says it can handle 35khz, and the software is set to that.

any ideas?

Cory

Offline rdean

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Re: Feedrate override makes machine stutter
« Reply #1 on: September 29, 2015, 04:33:39 PM »
if you are running Mach3 then check the version number. 
I think version # 62 works ok but not 66.
Ray


Re: Feedrate override makes machine stutter
« Reply #2 on: September 30, 2015, 03:50:43 AM »
Hi Ray

I am running v3.043.066.
Are there any known bugs on pulse control or similar on the .066 v?

I just installed it, and of course used the latest version.


best regards
Cory

Offline rdean

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Re: Feedrate override makes machine stutter
« Reply #3 on: September 30, 2015, 07:54:29 AM »
yes I had the same problem you are having with version 66.  Version 62 seems to work fine.
Ray

Offline ger21

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Re: Feedrate override makes machine stutter
« Reply #4 on: September 30, 2015, 08:11:51 AM »
Using high FRO values is a known issue with Mach3. It's best to program at double the feedrate, and start with a FRO of 50%.
Gerry

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

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Feedrate override makes machine stutter
« Reply #5 on: September 30, 2015, 04:48:52 PM »
Thanks for the info guys, I have to make some testcuts with different feedrates first to determine the settings in the tooltable.

I cannt seem to find any other versions than 0.66 on the download site.

Are there any other sources for previous versions?

BR
C

Offline ger21

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Re: Feedrate override makes machine stutter
« Reply #6 on: September 30, 2015, 09:21:16 PM »
Gerry

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

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html