re:Re: Stepper motors and increased Amps

--- In CAD_CAM_EDM_DRO@egroups.com, ballendo@y... wrote:

> Roman wrote:
> >I am using surplus Sanyo Denki 5.1v 1.0A size 23 (2 stack motors
> >which are 2" long) in my home mini mill,<snip>
>
> Roman,
>
> If the motors are 2" to 2.5" long, they would properly called SINGLE
> stack. BTW, these 5v,1A 23 SS surplus motors are 'everywhere'. They
> are usually rated around 60 oz. in. If you're paying more than about
> 5 bucks, you should keep looking, IMO.

Yes, I have a few from different sources!
I also have some larger and smaller 23 frame.
I *think* the 2" is a two stack, I have a few
1.25inch 23's and some about 3 inchers, and I
have seen them about 4" which would be 4 stack?
Different manufacturers might have different
stack sizes?

The main reason I'm using these is they have
special mounts on front AND back of the motor,
so they are an integral part of the 1980's
NEC 15" printers I got them from. These are
already belted and geared for good high speed
response and I need to cut 1/4 inch perspex
mainly, I have measured side force of the
motor/sliders to be a good 6kg even at higher
speeds like 360in/min.

> And there are LOTS of better motors for a minimill(sherline, taig,
> maxnc, etc) type project available nowadays. You'll pay more, but it
> WILL be worth it, IMO.

Yep, I have some 200oz 3stack hi-torque 23's,
these are being saved for a special project. :o)

> Ballendo
>
> P.S. I'm in the "gear it" for resolution, "microstep it" for
> decreased resonance camp... At least for the typical CNC machine,
> which has WIDELY variable speeds/ loads. I've known about torque
> compensating for some time...

Sure! But I orignally objected to the statement
that "microstepping has nothing AT ALL to offer
in terms of resolution". My needs in this project
are slightly different as the sliders are prebuilt
with 1 rev = 56.5mm travel, which I need to get the
high speeds, and going to 8th step drivers gives
me good resolution also, from the original
0.28mm/step to 0.035mm/step.

It just so happened that my research project was
microstepping and it was a good time to re-start
work on my little mill. :o)
-Roman