Re: [CAD_CAM_EDM_DRO] Hardware for CNC conversion

Gerald,

With 3v coils, sounds like Bipolar steppers. How many leads. 5 would
have to be unipolar (at that low voltage?). 4 or 6 are usually Bipolar.
8 could be driven by either. 90 in part number sounds like a size 34?
34 would be a little big for a Sherline, you want 23's, which are about
2.25 square on the flange. Don't know the inductance, but you may have
about 100-110 oz/in of torque. Current might be around 1A.

I'd check at Camtronics, for a bipolar 2A driver. If OVER 2 amps, try
for 5A. 1.8 degrees gives you 200 steps. What shaft size? Both ends?

http://www.seanet.com/~dmauch/

If you've got 3 or 4 of 'em, you may have a find! IF these numbers are
correct, 100 oz/in, they'd be OK for the mill or lathe.

YMMV

Alan


Area51tats@... wrote:

> Anybody have any suggestions for the hardware that goes between the computer
> and the stepper/driver motors themselves. Needs to be on the cheap or at
> least almost affordable, I still have to be able to feed the children after
> the purchase so one of those $1000 dollar units are out of the question. I am
> planning on using the motors out of a couple of scrapped printers. They are
> marked TEC stepping motors SPH-54AB-090 3 volts coil 3.5 ohm 1.8
> deg/step dont have a clue if these will even work on a sherline conversion
> but I am willing to try even if it means having to gear them down.
>
> Gerald