Re: [CAD_CAM_EDM_DRO] Suitable stepper for mini mill?

On Thu, 4 Dec 2003, Greg wrote:

> I'm just getting started so forgive the noob questions....

That's why this group is here.

> I was hoping if someone could tell me if the following motors would be
> too wimpy for a mini mill such as the seig/harbor
> freight/grizzly/micomark type.
>
> Motor info:
>
> Oriental Motor Co. Vexta # PH265-04-C9. 2-phase, 1.8 degree per step. 5
> VDC 1 Amp. 2.22" diameter x 2" long. 2.3" square mounting flange with 4

You *could* use these motors if you geared them down but you would end up
with a very slow machine. Suitable motors will probably be in the
1-3 volt range at 4-8 amps roughly. Those motors are maybe in the
80ish oz-in range and you probably want more like 250-400 oz-in.

> What is the minimum torque to drive, X,Y,Z axis of a minimill?

It depends on how much friction there is in the table, whether you are
using ballscrews or acme screws, what the pitch of the screws are, etc.
But I would guess 250-400 oz-in would be workable. Much more than that
would probably be overkill.

> Does any one have any low-cost suggestions for stepper motors/ sources?

Ebay is always good for deals but it may take awhile to find exactly what
you want.

C|