Re: [CAD_CAM_EDM_DRO] EMC2 DC-servo controlled minimill

awallin55 wrote:

>
> First 'serious' job, rough and finish cutting a model-yacht keel bulb
> out of steel:
> http://video.google.com/videoplay?docid=916833244018390029&hl=en
>

Wow, you REALLY like that FLOOD coolant! I never let it spray
like that because it gets EVERYWHERE. Your video had drips
running down the camera lens!

>
> It's controlled by EMC2 via an m5i20 pci-card from mesanet. The
> servo-amps are from Jon Elson / Pico-systems and the DC-servos from
> Dan Mauch / camtronics.
>

Well, obviously, you have gotten the servo amps working quite
well with the Mesa card! Congrats!

> The servos have 1000 count encoders so I get 4000 edges per revolution
> and they are direct-coupled to 2.5mm/rev ballscrews. I did the
> PID-tuning with rapids set to 4000mm/min and acceleration around
> 500mm/s and it stays inside +/- 16 counts or around 0.01 mm at all
> times. Better than this for actual cutting which we do at around
> 1500mm/min maximum.
>
> Next we are going to put an encoder on the spindle to enable rigid
> tapping.
>

I can't provide all the exact details for the Mesa encoder
counter, but I know how to do this with my boards. If you have
any problems, let me know.

Jon