Flipping Spindle Signal

andypugh
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5 years 5 months ago #210703 by andypugh

Replied by andypugh on topic Flipping Spindle Signal

(Inverting PWM pin)

Sadlers wrote: Yeah, I tried that. I doesn’t do what is needed.

It should. How did you do it?

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Sadlers
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5 years 5 months ago #210719 by Sadlers

Replied by Sadlers on topic Flipping Spindle Signal

I don’t know if my last reply went through so this may be a duplicate...
I used pncconf on the mesa board setup page to set the Spindle Output Inv checkbox. Tried with it checked and unchecked. Tested by using MDI in axis and using M3 and various Sxxx settings. Larger numbers = slower speed.

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Sadlers
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5 years 5 months ago #210722 by Sadlers

Replied by Sadlers on topic Flipping Spindle Signal

Here is the HAL file with the Inv checkbox selected

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chris@cnc
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5 years 5 months ago #210735 by chris@cnc

Replied by chris@cnc on topic Flipping Spindle Signal

To invert your spindlespeed set

Code:

loadrt scale 
addf scale.0 					servo-thread
setp scale.0.gain -1
setp scale.0.offset 6000

net spindle-output     => scale.0.in
net spindle-speed-DAC scale.0.out =>  [HMOT](CARD0).7i76.0.0.spinout

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andypugh
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5 years 5 months ago #210746 by andypugh

Replied by andypugh on topic Flipping Spindle Signal

Sadlers wrote: Here is the HAL file with the Inv checkbox selected

That seems to set

Code:

setp   [HMOT](CARD0).7i76.0.0.spindir-invert   true

which would reverse the spindle direction.

What you need is to invert the sense of the PWM pin.

Something like

Code:

setp   [HMOT](CARD0).gpio.000.invert_output true

But you need to work out which GPIO pin the PWM is on for this to work.

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Sadlers
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5 years 5 months ago #210760 by Sadlers

Replied by Sadlers on topic Flipping Spindle Signal

Chris,
i entered this in my custom hal file and linuxcnc will not start. Get the attached errors report. looks like I am trying to overwrite signals that have already been setup by PNCCONF. I tried handbombing the file created by PNCCONF and couldn't make it work. any suggestions?

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Sadlers
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5 years 5 months ago #210761 by Sadlers

Replied by Sadlers on topic Flipping Spindle Signal

I am controlling my spindle drive with an analog output (which generates pwm to the motor). Looking through the hal meter pins/signals I can’t locate anything that looks like an invert_output for the analog output. Do you know what this would be called?

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PCW
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5 years 5 months ago #210764 by PCW

Replied by PCW on topic Flipping Spindle Signal

This (modification of your hal file) should be close:

Attachment not found

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Sadlers
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5 years 4 months ago #210840 by Sadlers

Replied by Sadlers on topic Flipping Spindle Signal

Thank you very much for your help.

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