From Paraport to MESA, RPM Issue (maybe)

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03 Feb 2019 00:41 - 03 Feb 2019 00:41 #125569 by russtuff
At least I think RPM is the issue. I'm not using a spindle encoder on my lathe right now, and when I set S1000 I get 1001RPM in Axis. I'm wondering if this is why the machine will do everything right up to the first G1, and it's waiting for the RPM to match. I have a Huangyang VFD controlling the spindle.

From my postgui.hal:
loadrt scale count=1
loadrt lowpass count=1
loadrt abs count=1
addf scale.0 servo-thread
addf lowpass.0 servo-thread
addf abs.0 servo-thread

setp scale.0.gain 60
setp lowpass.0.gain 0.010000
net spindle-velocity => lowpass.0.in
net spindle-fb-filtered-rps      lowpass.0.out  => abs.0.in
net spindle-fb-filtered-abs-rps  abs.0.out      => scale.0.in

# SET UP SPINDLE AT SPEED INDICATOR
net spindle-at-speed => pyvcp.spindle-at-speed-led

# load a near component and attach it to a thread
loadrt near
addf near.0 servo-thread

# connect one input to the commanded spindle speed
net spindle-cmd => near.0.in1

# connect one input to the encoder-measured spindle speed
net spindle-fb-filtered-abs-rpm => near.0.in2

# SET THE SPINDLE AT SPEED INPUTS TO AGREE IF THEY'RE WITHIN 1%
setp near.0.scale 1.01

# ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
# HAL CONNECTIONS FOR THE VIRTUAL PANEL DISPLAY
net hy-RPM <= spindle-vfd.Rott => pyvcp.spindle-speed

# SET SPINDLE AT SPEED INDICATOR TO TRUE IF WE CHOSE NO FEEDBACK
# CURRENTLY OFF, BUT TURNING IT ON DOESN'T HELP ANYTHING.
# sets spindle-at-speed true
Last edit: 03 Feb 2019 00:41 by russtuff.

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03 Feb 2019 01:09 #125570 by russtuff
Nope, that isn't it. I was able to S999 and Axis reads the same but still no movement during G1.

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03 Feb 2019 01:15 #125571 by tommylight
You have hal set to wait for spindle to match the speed commanded, but it is not connected to any feedback from the spindle.
Connect the feedback or remove the lines that pertain to waiting for it to match.

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05 Feb 2019 00:40 #125710 by russtuff
Thank you. I'm basically shooting in the dark and while I don't have it working properly yet, I have discovered that by not calling G95 it does let the program run, albeit at a painfully slow feed rate.

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06 Feb 2019 03:27 #125782 by russtuff
I've finally got the spindle-at-speed LED to come on when the spindle is up to speed. The RPM value being reported in Axis is within .01% of the RPM requested from the VFD, and my 'near' value allows for 1%. Yet it still isn't feeding. I can't think of anything else it could be waiting for. Does anyone have any more ideas?

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06 Feb 2019 15:42 #125816 by PCW
is motion.spindle-speed-in connected to the proper signal?

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