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IMHO a lot of People do rigid tapping with 1 pulse/rev, i never tryed because my CSLab controller's do tapping only with
Encoder module. try and error will e the only way to figure out.
if you what to use tapping cycle (G84) you must have a spindle index Signal, does not matter wether spindle
in in Step/dir or analog mode.
Hi,
using Mach4 its possible to use either analogue velocity mode OR Step/Direction mode at will.
I can do both, but in truth VERY seldom use Step/Direction, as a free running spindle (analogue velocity) is enough
for my purposes, and analogue velocity mode is SO EASY to use.
I would suggest that unless there is specific reason to employ a more complicated solution then just use plain old PWM
output with the servo in velocity mode, its so simple!
Craig
depending on your Motion Controller you can run your spindle in step/dir mode as well.
also the servo Controller supports a PZ+/PZ- Signal witch is a single pulse per rev. that can
be used for a index Input. i use this signals on my machines for indexed homing on the Motion axes.
Hi,QuoteThis is a Chinese Servo. They seems decent enough for my application.
I don't think there is to much issue with these Chinese servos, they seem to operate as they should and while not top quality they are not
rubbish either, entirely suitable for our purposes.
Where I do take issue with these Chinese products is the Chinglish documentation and even more damningly NO PC based set-up and tuning software.
My advice to users new to servos would be to get a slightly more expensive but better brand like Delta or DMM which have vastly superior
documentation, support and set-up software. Once you learnt how to get the best from that thereafter you'll have no trouble transferring what
you have learnt to the cheaper brands, almost all AC servos are very similar to each other, if you can 'drive' one you can 'drive' others.
Craig
Most of the time my AC servo runs as in velocity mode with a 0-10V PWM input, easy. My Allen Bradley servo has dual mode,
so by asserting one digital input to the drive it changes from analogue velocity mode to step/direction position mode.
Thus when I want to do a C-axis move during a job I call a macro that asserts the change-over pin, then write Gcode
of the form:
G1 C3600 Z-10
which results in the Caxis (spindle) doing 10 revolutions while the Z axis descends 10mm for a 1mm pitch helical interpolation move.
Once the Caxis move is complete I can run another macro to de-assert the changeover pin and the spindle goes back to analogue velocity
mode with PWM input. This all happens without any intervention on my part while running the Gcode program.
If I think at Mahc3 I guess you will have to assign same step and dir pins and port to spindle and C axis (C axis set it as angular axis)
Hi,QuoteJust with the SERVO encoder? That would be really interesting
Yes, that is exactly how my C axis works.
Craig
You could signal the drive, one pulse = one revolution, but it would be very coarse. All AC servos have the principle of electronic gearing.
It allows that you can signal the drive at one rate, say 1324 pulse per rev, but the servo encoder is 10,000 pulse per rev. Electronic gearing allows
very great flexibility in application of a servo.
Craig
I will have to start makikng a M6 macro for ATC carousel I am making. That will be quite a challenge
is soon your Hardware (Inputs/Outputs) is clear just start a new thread, and we will seen.
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