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- Spindle synchronization with only one Initiator / one pulse - Emulate an encoder
Spindle synchronization with only one Initiator / one pulse - Emulate an encoder
07 May 2021 05:08 - 07 May 2021 05:16 #208180
by Sviper
Spindle synchronization with only one Initiator / one pulse - Emulate an encoder was created by Sviper
Hello
Is it possible to use spindle synchronization with only one initiator that monitors the spindle speed?
Since the syncronization needs different signals from a real encoder, I would be interested if you could emulate an encoder with Hal functions.
You would have to generate the encoder signals phase-A and phase-B, phase-Z from the one pulse and the direction of rotation command.
I would like to use the G33.1 unfortunately this requires all encoder signals A,B,Z . I am still looking for a way to bypass a conversion of my milling spindle, since it is a motor spindle and this conversion would be quite extensive.
Example from the documentation
# connect the HAL encoder outputs to LinuxCNC.
net spindle-position encoder.3.position => spindle.0.revs
net spindle-velocity encoder.3.velocity => spindle.0.speed-in
net spindle-index-enable encoder.3.index-enable <=> spindle.0.index-enable
# connect the HAL encoder inputs to the real encoder.
net spindle-phase-a encoder.3.phase-A <= parport.0.pin-10-in
net spindle-phase-b encoder.3.phase-B
net spindle-index encoder.3.phase-Z <= parport.0.pin-11-in
Would this be possible?
Possibly I would also use external hardware
Is it possible to use spindle synchronization with only one initiator that monitors the spindle speed?
Since the syncronization needs different signals from a real encoder, I would be interested if you could emulate an encoder with Hal functions.
You would have to generate the encoder signals phase-A and phase-B, phase-Z from the one pulse and the direction of rotation command.
I would like to use the G33.1 unfortunately this requires all encoder signals A,B,Z . I am still looking for a way to bypass a conversion of my milling spindle, since it is a motor spindle and this conversion would be quite extensive.
Example from the documentation
# connect the HAL encoder outputs to LinuxCNC.
net spindle-position encoder.3.position => spindle.0.revs
net spindle-velocity encoder.3.velocity => spindle.0.speed-in
net spindle-index-enable encoder.3.index-enable <=> spindle.0.index-enable
# connect the HAL encoder inputs to the real encoder.
net spindle-phase-a encoder.3.phase-A <= parport.0.pin-10-in
net spindle-phase-b encoder.3.phase-B
net spindle-index encoder.3.phase-Z <= parport.0.pin-11-in
Would this be possible?
Possibly I would also use external hardware
Last edit: 07 May 2021 05:16 by Sviper.
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07 May 2021 12:06 #208204
by andypugh
Yes. No need for anything particularly clever.
Basically connect phase-A and phase-Z of the counter to your parport pin, make sure that you set the encoder to counter-mode and ensure that you use the position-interpolated pin to smooth the motion.
Replied by andypugh on topic Spindle synchronization with only one Initiator / one pulse - Emulate an encoder
Is it possible to use spindle synchronization with only one initiator that monitors the spindle speed?
Yes. No need for anything particularly clever.
loadrt encoder
...
addf encoder.0.capture-position servo-thread
addf encoder.0.update-counters base-thread
...
net pulse-index-combined parport.0.pin-NN-in encoder.0.phase-A encoder.0.phase-Z
setp encoder.0.counter-mode 1
net spindle-position encoder.0.position-interpolated => spindle.0.revs
net spindle-velocity encoder.0.velocity => spindle.0.speed-in
net spindle-index-enable encoder.0.index-enable <=> spindle.0.index-enableBasically connect phase-A and phase-Z of the counter to your parport pin, make sure that you set the encoder to counter-mode and ensure that you use the position-interpolated pin to smooth the motion.
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