Ramp out step/dir servo spindle
19 Oct 2020 13:52 #186583
by jazial
Ramp out step/dir servo spindle was created by jazial
Hello,
I'm trying to set up a spindle on a mill using a step/dir servo
I've managed to make it ramp in, using but i'm not sure the way to ramp out
Ideally I want M5 to ramp out, waiting for the spindle to deactivate stepgen.
As i need rigid tapping too, it's very confusing for me at this time
Background :
The machine I'm working on was retrofitted with linuxcnc 5 years ago (3 DC servos on axes, 1 three phase servo on spindle, +/- 10 signal for all), and everything goes well till summer 2020 when one DC driver fried both 7i77 and itself and 3 phases driver seems like to be near to death
I've changed every motors and drivers for AC 3 phases servos, tried to make them working with +/- 10v, and then figured that 7i77 didn't count anymore on some encoders inputs (worse, moving MPG on encoder 02 increased encoder 00 counts, so really hard to tune the system)
As I had a 7i76 laying around, I'm trying to redo my config with step/dir signals
I've added a 7i85s to read encoders, but closing loop is not done at this time on axes, I'm just trying to complete it on spindle first.
Thanks
I'm trying to set up a spindle on a mill using a step/dir servo
I've managed to make it ramp in, using but i'm not sure the way to ramp out
Ideally I want M5 to ramp out, waiting for the spindle to deactivate stepgen.
As i need rigid tapping too, it's very confusing for me at this time
Background :
The machine I'm working on was retrofitted with linuxcnc 5 years ago (3 DC servos on axes, 1 three phase servo on spindle, +/- 10 signal for all), and everything goes well till summer 2020 when one DC driver fried both 7i77 and itself and 3 phases driver seems like to be near to death
I've changed every motors and drivers for AC 3 phases servos, tried to make them working with +/- 10v, and then figured that 7i77 didn't count anymore on some encoders inputs (worse, moving MPG on encoder 02 increased encoder 00 counts, so really hard to tune the system)
As I had a 7i76 laying around, I'm trying to redo my config with step/dir signals
I've added a 7i85s to read encoders, but closing loop is not done at this time on axes, I'm just trying to complete it on spindle first.
Thanks
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20 Oct 2020 00:33 - 20 Oct 2020 00:36 #186640
by pippin88
Replied by pippin88 on topic Ramp out step/dir servo spindle
Yes, you need to delay disabling the stepgen output until after spindle has slowed down.
Two ways:
Time delay
Wait until spindle rpm reaches certain level (near 0rpm)
I am currently using a simple time delay:
hal:
ini:
Two ways:
Time delay
Wait until spindle rpm reaches certain level (near 0rpm)
I am currently using a simple time delay:
hal:
#### only code relevant to spindle ramp shown
# --- Spindle accel / decel --- #
loadrt limit3
addf limit3.0 servo-thread
setp limit3.0.maxv [SPINDLE_9]SPINDLE_RAMP
setp limit3.0.enable true
net spindle-vel-cmd-rps => limit3.0.in
net spindle-output <= limit3.0.out
net spindle-output => hm2_7i43.0.stepgen.04.velocity-cmd
# --- timedelay before disable spindle output for deceleration ramp --- #
loadrt timedelay names=timedelay.spindle-enable-soft-stop
addf timedelay.spindle-enable-soft-stop servo-thread
setp timedelay.spindle-enable-soft-stop.on-delay [SPINDLE_9]ON_DELAY
setp timedelay.spindle-enable-soft-stop.off-delay [SPINDLE_9]OFF_DELAY
net spindle-enable => timedelay.spindle-enable-soft-stop.in
net spindle-enable-soft-stop <= timedelay.spindle-enable-soft-stop.out
net spindle-enable-soft-stop => hm2_7i43.0.7i76.0.0.output-09 hm2_7i43.0.stepgen.04.enable
ini:
#********************
# Spindle
#********************
#only code relevant to spindle ramp shown
SPINDLE_RAMP = 20
ON_DELAY = 0
OFF_DELAY = 5
Last edit: 20 Oct 2020 00:36 by pippin88.
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