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Spindle setup - help
« on: February 28, 2008, 07:27:08 PM »
Hi -
I have a mill conversion on the go -

What is the preferred interface for the spindle speed control ? (step/dir or pwm)

It has a servo motor on the spindle - does anyone know if I can drive this with a gecko servo drive (or will it not go fast enough) ?
The servo is about 60volts and 500 step rev encoder

And what is the max number of steps a second that mach3 might do ?

Best regards
Dom @ Australia

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Re: Spindle setup - help
« Reply #1 on: February 28, 2008, 08:04:15 PM »
Mach can do safely 45KHz per axis (some guys can get as much as 100KHz and more, depends on computer/port etc) so thats 45,000 steps per second. With your 500 encoder thats 2000 per rev. 45,000 /2000 =22.5 Revs per second =1350RPM.
 I am thinking of doing this on the mill I am retrofitting at the moment, I have a 5KW AC Servo but I will be using the smoothstepper for this machine and that means I have a max pulse of 4MHz, my encoder is 2000 line (8000 as far as Mach is concerned) so I could spin my motor at 30,000RPM if it would do it without flying into ten million bits LOL. 4000 is its max so I have plenty of headroom. :)