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Home Forum General General LinuxCNC Questions Reverse spindle no pwm

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TOPIC: Reverse spindle no pwm

Reverse spindle no pwm 19 Mar 2012 22:58 #18657

  • grandixximo
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I'm trying to get a spindle work in both directions, but i do not get any pwm output when i start the spindle in M4

i'm using pdm mode with no offset and a scale of 18900

max-dc 0.4

the spindle at maximum speed is roughly 6500RPM

i do not use outputs to turn the spindle on, the spindle is stopped at pwm 0

Also i am using the soft start hal lines

and i only connected net spindle-rev motion.spindle-reverse => parport.0.pin-17-out


any help???
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Re:Reverse spindle no pwm 20 Mar 2012 00:27 #18658

  • grandixximo
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Attached i made a simple stepconf to demonstrate what i mean, check pin curr-dc of pwmgen and notice that you get a value only when the spindle is going clockwise nothing when you go ccw This attachment is hidden for guests. Please log in or register to see it.
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Re:Reverse spindle no pwm 20 Mar 2012 07:59 #18665

  • grandixximo
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Resolved using abs component in hal to have the spindle speed always positive.
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Re:Reverse spindle no pwm 20 Mar 2012 10:10 #18670

  • BigJohnT
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This has come up before, I wish I could figure out a good place in the manual to say something about this...

John
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Re:Reverse spindle no pwm 20 Mar 2012 10:27 #18672

  • PCW
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Isn't this a bug/ommission in stepconf that it does not set the PWM mode correctly?
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Re:Reverse spindle no pwm 20 Mar 2012 18:57 #18675

  • grandixximo
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I think a good place to add this in the docs would be here

linuxcnc.org/docs/html/examples_spindle....#Spindle%20Direction

it says that all you have to do is connect a pin to have the spindle running in the opposite direction, but actually if you don't hijack the spindle speed out with abs you will not get any frequency out of pwmgen
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