Re: [CAD_CAM_EDM_DRO] running brushless servos with emc

> I am the very lucky owner of a 3axis setup that has brushless servos.
> Draw back is that control system was via delta-tau cards.
> Amplifiers are copely 10v+- signals. I need help/advice on what I
> need to add so I can use EMC for control.
> I have two of these machines and one is part way thru a conversion
> to steppers. Seems a waste to do this to the second one.
> The motor/encoder/amplifier/power supply connections are all intact
> omly my inexperience is keeping me from having a very cool servo
> 20x20x12 machine.
> I have investigated the delta-tau setup[thanks for the advice on
> that] I quickly came to the conclusion that I have neither the skill
> or money to use them.

The delta tau boards actually aren't bad, but they do take some
getting used to.

Anyway, to replace them you would need an analog output card to
generate the +/-10v signals and a quadrature input card to monitor the
encoders. The only family of cards I believe EMC supports by default
is the "servo to go" which includes both the analog output and encoder
input. I've hacked up drivers for another card that I found in the
trash, but it sounds like you don't want to get into modifying the
software.

The STG card isn't cheap, but you can probably get something for your
delta tau boards on Ebay.

Chris Stratton

-------------------------------------------------
Christopher C. Stratton
Engineer, Instrument Maker, and Horn Player
ccs@... 617 628 1062
http://web.mit.edu/~stratton/www/brassbuild.html