Servomotor control

[IanH]

I've posted this elsewhere hoping for some kind soul to take pity!
My milling machine has a SEM 4000RPM 130V 6.8A Ferrite brushed DC servomotor. I can source a driver, (230V AC; I'm in the UK), to suit the motor but need to output +10v to -10v from Mach3. What do I need to interface my parallel port with to get 10v output?

[H.O]

Hi,
There used to be the Pixie-cards from www.skyko.com but they are now discontinued since the inventor moved on to better things to do. One way would be to get the DSPMC from Vital systems. It connects to Mach3 over TCP/IP and will output +/-10V to control your analog servodrive. I have no personal experience with it though.

There's also the Galil line of products which Mach3 is supposed to support - to some extent. You'd need to look into which cards is supported and what they can and can't do.

Then we have the option of using a S/D servo drive like the Gecko320 among others. The Gecko is limited to 80V MAX so your top-speed will be limitied. If you don't mind putting together a kit you might also want to look into the new version of the UHU-drive, called HP UHU, it should drive that motor witout any problems as long as it has a suitable incremental encoder mounted.

[samco]

Take a look at emc2 also..

http://www.linuxcnc.org/
and
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl

Look at the supported hardware here..
http://wiki.linuxcnc.org/cgi-bin/emc...orted_Hardware
both mesa, vital and ppmc from pico systems cards have options of +/-10v

Emc2 is opensource (free as beer and speech) and is very configureable.

plus in the future (when you add a spindle encoder) you could do stuff like this

YouTube - M6 rigid tapping

YouTube - M6 rigid tapping