On Saturday 16 February 2013 07:58:23 Tomaz T. did opine:
> I'm trying to make working my spindle rpm display (pyvcp), but don't
> know which signal to connect or take from my .hal file.
>
> Here is what is in my hal file for spindle:
>
>
> net spindle-enable <= motion.spindle-on => stepgen.2.enable
> net spindle-cmd motion.spindle-speed-out => scale.0.in
> net spindle-freq <= scale.0.out => stepgen.2.velocity-cmd
> net spindle-out <= stepgen.2.step => parport.0.pin-14-out�
> net spindle-fwd motion.spindle-forward => parport.0.pin-16-out
>
>
> and what I have in hal for display:
>
>
> addf mult2.2 servo-thread
> setp mult2.2.in1 28.75
> net cypher_speed mult2.2.in0 <= spindle-vfd.frequency-out
> net speed_out pyvcp.spindle_rpm <= mult2.2.out
>
>
> Probably spindle-vfd.frequency-out should be replaced with something
> from hal to make correct connection in my case?
Mine goes through some contortions, but the signal is originally derived
from encoder.0.velocity as I have a 50 cycle encoder on my lathes spindle.
net spindle-feedback0 encoder.0.velocity
scale.0.in scale.1.in scale.2.in
# so scale.2 is the next grep.
addf scale.2 servo-thread
setp scale.2.gain 60 # sets spindle display
calibration, set at 10 rps=600 rpm
setp scale.2.offset 0.0 # for completeness
net tach-feed scale.2.out
limit2.3.in # to smooth tach reading
# and that feeds "limit2.3.in" so
addf limit2.3 servo-thread
# smooth the tach readin
setp limit2.3.maxv 400
# denoise the spindle rpm display
net spindle-rpm-filtered limit2.3.out
pyvcp.spindle_rpm
# the limit2.3.maxv makes it behave much like a mechanical tach needle,
adjust to suit. 400 approximates the slam it to full speed delta accel
my spindle can do with a 5" 4 jaw chuck mounted. Toy lathe, obviously.
Calibration, scale.2.gain is derived from my oscilloscopes time base,
watching the encoder index pulse where 1 second between pulses is
1 rps=60 rpm etc. The encoder module also has an -rps output but
I found its much noisier. This works well for me.
Not of course in the above order as my .hal file is more ordered than
the above, I got that my 'grep'ing, and I do not use the => or <= syntax
in my "net" statements. My spindle is pid servo'd. Not as 'stiffly' as
I would like, but it saves fuses that way too, while still carving great
threads.
Cheers, Gene
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