Feed per Rev - Turning

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09 Nov 2017 14:31 #101557 by MattSav
Hi,

I've just converted my Colchester Student lathe to LinuxCNC.

Its my first time with Linux CNC, previously used Mach3 and UCCNC.

Anyway it all seems to be working OK apart from feed per rev.

When I over ride the spindle speed, going faster gives a lower feed per rev and vice versa. I think its also doing this when running Gcode (ie, lower feed per rev with higher spindle speed).

Any ideas???

Matt

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09 Nov 2017 14:50 #101558 by bevins
Replied by bevins on topic Feed per Rev - Turning

Hi,

I've just converted my Colchester Student lathe to LinuxCNC.

Its my first time with Linux CNC, previously used Mach3 and UCCNC.

Anyway it all seems to be working OK apart from feed per rev.

When I over ride the spindle speed, going faster gives a lower feed per rev and vice versa. I think its also doing this when running Gcode (ie, lower feed per rev with higher spindle speed).

Any ideas???

Matt


Got pics? I have a colchester lathe and have ideas on converting...... I wouldnt mind looking at some pics of yours....

Thanks, sorry, I dont have a responce to your issue.

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10 Nov 2017 16:00 #101613 by PCW
Replied by PCW on topic Feed per Rev - Turning
Sounds like your hal file is not linking motion.spindle-speed-in to the
actual spindle speed from your spindle encoder

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10 Nov 2017 16:22 #101617 by Todd Zuercher
Is it possible that his RPM is exceeding his sampling rate? So that as the spindle is turning faster, but Linuxcnc sees it as slower or unchanged because of missed counts.

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10 Nov 2017 16:27 #101619 by PCW
Replied by PCW on topic Feed per Rev - Turning
It certainly possible, but easily checked by watching motion.spindle-speed-in

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12 Nov 2017 11:19 #101687 by andypugh
Replied by andypugh on topic Feed per Rev - Turning

Got pics? I have a colchester lathe and have ideas on converting...... I wouldnt mind looking at some pics of yours.....


I would like to see this too. I converted a Holbrook Minor

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