On 02/15/2020 08:04 PM, Phill Carter wrote:
I understand that if you are using a +/-10V with encoder feedback directly back
into LinuxCNC that this concept would not work for you. But since you say you
need LinuxCNC can you tell us what you do have?
How is your LinuxCNC connected to your milling machine lead (ball?) screws and
spindle motor?
Well, in my case, I have a portable machine for demos at
shows and such, that uses my PWM controller and PWM servo amps.
See http://pico-systems.com/minimill.html for some old
pictures of this machine.
And, for real machining, I have an ancient Bridgeport
(1938-41 vintage) converted to CNC with ballscrews and DC
motors.
http://pico-systems.com/bridgeport.html
This uses my PPMC board set for analog servo amp control,
and my own analog velocity servo amps. I started using this
in 1996 with an ancient Allen-Bradley CNC control, then
moved to the original EMC in 1997 with a Servo to Go card.
In about 2005 I started using my own PPMC motion control
interface, but otherwise the same servo amps and encoders.
Since then, I have added rigid tapping and a Blum touch probe.
Jon
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