"Bob Engelhardt" wrote in message
...
$30, free shipping. 15a, 20 - 80v with TACH feedback (not encoder). Not
for CNC, but good for running a spindle with excellent low speed torque.
I just bought one for my mill.

The auction has ended, but the seller had 24 left.

http://tinyurl.com/m898jg auction # 170332489842

Bob

I have an older Anilam CNC Bridgeport and Anilam CNC lathe. They both use
motors with tach feedback, the mill uses DRO scales for position feedback to
control and the lathe uses encoders coupled to the ballscrews. I replaced
the original amplifiers with AMC amplifiers similar to those in your link,
they work great.

My Anilam control didn't work on the lathe so I converted it to EMC2. I set
up the control to try to give a velocity feedforward and a proportional
signal, with a little bit of intergral to get rid of small offsets.

So, if someone has motors with tach feedback and would like to do a homebrew
CNC, use these amps with an external encoder going to the control and they
are great for CNC. I run EMC2 (free) and Linux (free) on a $35 eBay
computer ($70 shipped), a Mesa board ($200), a Mesa PWM to analog board
($69), a Mesa I/O Board ($69). Bottom line is I converted to EMC2 for
probably less than it would cost to fix the old control plus I gained
spindle speed control, more I/O capability, more program memory and storage,
and I can browse the internet while on the lathe. :-)

RogerN