New Mill Build...Can I use LinuxCNC?

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18 Oct 2020 04:02 #186440 by Mayberry Customs
If I’m not mistaken this seems like a servo setting...I am not using servos, I am using stepper motors. Thanks, Andy

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18 Oct 2020 06:55 #186442 by rodw

Mayberry Customs wrote: If I’m not mistaken this seems like a servo setting...I am not using servos, I am using stepper motors. Thanks, Andy


Just edit your ini file by hand as Peter said. Its still applicable for steppers.

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18 Oct 2020 08:36 #186444 by BeagleBrainz
Is the scale right as well I thought I saw some numbers around 8000 or so

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18 Oct 2020 13:58 #186464 by Mayberry Customs
Ok I know this has to be a stupid question but here goes anyways lol...I am opening the ini in Vim and I can find the p value and I am changing it from 10000 to 1000...then how do I save the changes? If I just exit out of Vim when I reopen the ini to double check it, it’s right back to 10000. I am completely new to Linux sorry for the incompetence. Thanks, Andy

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18 Oct 2020 14:52 - 18 Oct 2020 14:52 #186467 by PCW
There is probably an easier to use editor on your system, either mousepad
or gedit
Last edit: 18 Oct 2020 14:52 by PCW.

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18 Oct 2020 14:53 - 18 Oct 2020 14:55 #186469 by Aciera
Any particular reason you use vim?
I prefer to use "Text Editor" to edit the files. It's nice and simple and works great.

[edit]
Or the ones suggested by PCW.
Last edit: 18 Oct 2020 14:55 by Aciera.

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18 Oct 2020 14:54 #186470 by partec
to use Geany or Gedit would be easier

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18 Oct 2020 14:59 #186471 by Mayberry Customs
Ok great that’s what I will do...I just used Vim because that was the default program it opened with...simpler and easier sounds great lol...thanks, Andy

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18 Oct 2020 20:17 #186502 by Mayberry Customs
PCW that was the problem! ...now to figure out a optimized driver timing...am I correct that the lower you can set these timing numbers, As long as the steppers still function, the faster the machine can move?...I set everything back to the default settings as far as driver timing. When continuous jogging anything over 40 in/m the steppers start losing steps. What is a respectable speed? I realize that the mechanics of the machine will play a role into the speed, just trying to get an idea of what to expect. Thanks so much, Andy

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18 Oct 2020 20:32 #186505 by rodw
It all depends.... If the pulses are too short, they won't be seen, if they are too long they will limit maximum stepgen frequency. I looked at it based on the motor RPM.
With An Arduino, I could not get over about 400 rpm
With a Mesa I could get to about 800 rpm. I think I settled on about 750 rpm as being the rapid speed. Thats a number you can reconcile with torque charts.
I played with the stepgen frequency by altering the microstepping and eventually Linuxcc reported an error saying it could not honour that frequency. I settled on 20x microstepping using Longs Motor DM542A and 48v power supply.
I still use 20x with the Lam drivers I am using but I will be seeing if I can increase the microstepping one day. These high quality drives should go a lot further.

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