Re: [CAD_CAM_EDM_DRO] Re: Stepper Size Selection

I would take a good look at how you plan to mount the motor and the
physical dimensions of the leadscrew end bearing plate and go from
there. Also, it depends on availability particularly with respect to
surplus vs new materials. I would tend to go with the smaller motor
at least for the X to limit table deflection caused by weight, but
this might not be an issue depending on the actual product you get.
Also, many people use a larger motor on the Z axis due to the weight
of the spindle assembly. In this case, it would be larger torque and
probably the larger frame size as well.

One thing to keep in mind is that it is easy to turn down the speed if
you decide that it works fine for you at a slower pace, but it is a
big deal to upgrade the motors and drivers later if you decide you
want higher top speeds. I find that one of the big constraints on
these sort of machines is not the motors, but the length of the table
travel itself. There's no need to go to 100+ IPM if you only have a
maximum travel of a few inches on each dimension. This is different
from a CNC router which might have a travel of 48+ inches on each
axis.

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?
>