On Wed, 2012-02-22 at 16:18 -0500, Erik Friesen wrote:
> You could take a look at the marine applications (inrunners), there are
> some water cooled.  What will your supply be?  You'll want to decide what
> rpm you want to run, as the higher kv, the lower the torque.  Are you going
> to belt drive, or direct drive some way?
... snip

The supply will be whatever it needs to be. I don't think torque would
be a problem because the etching bit will most likely be small at the
tip. I suppose the RPM will need to be in the 100k range to get decent
cutting feed rates? I have model car motor I used for drilling circuit
boards which worked well. I want to mount the motor on axis with the
tool holder and keep the overall length as short as possible.

I was thinking about doing this a while back and I'm now beginning to
remember some the issues I faced back then. I may have come to the
conclusion that the outrunner was not ideal. I need to think about this
some more. I think my last plan was for a backyard version of a Tormach
speeder:
http://www.tormach.com/product_pcnc_acc_speeder.html 

Thanks for the replies.
-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA


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