Originally Posted by Dan Falck  Hi Jon,
I'm glad to see you have a forum here. Maybe you could post a few pics of machines running your systems. |
Hmmm, I'll see what I can do. I do have just a FEW pictures on my web site at
http://pico-systems.com/minimill.html
and
http://pico-systems.com/bridgeport.html I'm hoping to buy some of your PWM brush servo drives after the holidays. Christmas is eating away at the budget currently, |
yeah, I know about that one!
but there is always hope : )
I have that Bridgeport with the big SEM motors on it.
Thanks,
Dan |
Well, the only problem with the PWM system is it needs fairly high encoder resolution to make up for not using tachometer feedback for velocity control. The higher the encoder resolution, the more precise the motion and velocity control will be. (Higher resolution decreases the sensitivity to the PID's D term magnifying the quantized nature of encoder counts.)
My own Bridgeport has my own velocity servo amps, which I made available as a kit - I supplied the boards and a few parts, the buyer had to supply the rest. I sold about 60 boards, I know of NOBODY who is actually using them.
Jon