Re: [CAD_CAM_EDM_DRO] Re: Stepper Size Selection

On Sun, Jun 15, 2008 at 9:25 AM, dnaman43 <mevagissy@...> wrote:

>> OK, that gives me a good ballpark figure. I suspect that a motor of that
>> size might be obtained in a NEMA-23 or a NEMA-34 frame size. Is that
>> true? If so is there any notable advantage of one over the other?

Two EE comments ;-) .

NEMA-23's tend to be lighter, if the motor is a significant part of the
mass, smaller is better.

NEMA-34's tend to dissipate heat better, if there is poor heat sinking,
bigger is better.

If the motor mounts solidly on a Bridgeport knee, who cares. If the
motor mounts to a tiny machine, a smaller motor can translate into a big
speed advantage. If your precision E/G machine doesn't handle heat very
well, the NEMA-34 will dump less heat into the table structures and
cause better accuracy.

See, in consultant-speak, "It depends." =-O

--
David G. LeVine
Nashua, NH 03060