RE: [CAD_CAM_EDM_DRO] stepper size

> "slow as a clock"! You can find only NEMA Size 23 motors for that low a
> current! You will need AT LEAST Size-42 motors, even if you
> build it as fine
> as an astrophysical instrument!

A friend has a CNC flamecutter/plasma cutter table that is driven by rack
and pinion. It is large enough to cut 4' x 8' panels and uses 135 in/oz NEMA
23 motors to direct drive the pinions. If I remember correctly it will
easily do 200 ipm. No NEMA 42 motors required.

> You should realize at the outset you will need a state-of-the-art
> "bipolar
> chopper" drive for each axis. The Superior Electric division of
> Warner Dana
> (I give you a link, below) make suitable drives and excellent steppers.
> Expect to pay serious change for such!

You may want to look at the 5 amp chopper driver controller kit that Dan
Mauch at Camtronics ( http://www.seanet.com/~dmauch/ ) offers. It may not be
as sophisticated as the Superior drive, but it does a great job and the 3
axis kit is only $225.

Tim
[Denver, CO]