RE: [CAD_CAM_EDM_DRO] Re: Stepper motors ( giants ) cheap.

From my understanding there is nothing wrong with this approach other than
the fact that the high inductance will limit your maximum rpm. The 4"/sec
figure will not equate on all systems with the 72 rpm limit that are
mentioned. When you look at Art's machine you will notice he is using belts
to move the visible axis's. There are no lead screws that I can see. The
point is Art would have far less steps per inch most likely than a machine
with screws. On my Shoptask I have 5 tpi ballscrews and 2:1 reduction belts.
This means I need 10 motor turns for each inch of travel. At 72 rpm I would
only be getting a pokey 7.2 ipm or .120"/sec.

Tim
[Denver, CO]

> -----Original Message-----
> From: Terry May [mailto:tmay@...]
> Sent: Friday, August 18, 2000 9:14 PM
> To: CAD_CAM_EDM_DRO@egroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Stepper motors ( giants ) cheap.
>
>
> Ok everyone,
>
> Is there a down side to this other than the speed??
>
> I could sure live with 4"/sec. It would be about 1/10 the cost of
> comparable torque steppers.
> Terry May
>
>