Re: [CAD_CAM_EDM_DRO] small 3-axis micro stepper

J wrote:

>
> OK--one vote so far that the 2.5 amp bipolar drive from xylotex may
> not be enough (thanks Bob). Anyone have experience converting an Enco
> mill/drill table to cnc? Anyone pushed their 2.5 amp cnc to the limit
> and want to share your performance? Any help would be appreciated--
> just keep in mind that I am on a tight budget and am no E.E.
>>Here are the specs. on the Enco slide table:
> *11" X 7-1/2" travel
> *10TPI leadscrews
> *The y-axis probably moves 35-40lbs with an empty table

> By the way, xylotex suggested a nema 23 powermax II 253oz-in Bipolar motor
> (2.3 amps bipolar series). Thanks for any replies.

Jared:

I'm looking at the Sanyo Denki specs for various steppers (to see if any
seem to be compatable with your Xylotex driver):

Here are some close matches (ie 2.5 amp range bipolar):
NEMA 17 1.60V 1.0A 20.8 oz*in (holding torques)
NEMA 17 1.60V 2.0A 37.5 oz*in
NEMA 23 1.80V 3.0A 55.2 oz*in
NEMA 23 1.60V 2.0A 117 oz*in
NEMA 23 2.20V 3.0A 139 oz*in
NEMA 23 2.10V 2.0A 180 oz*in
23 2.3A 253 oz*in Powermax II
NEMA 34 4.60V 2.0A 388 oz*in
NEMA 34 5.40V 2.0A 720 oz*in
NEMA 34 7.20V 2.0A 1053 oz*in (possibly too marginal, as 35/7.2 = 4.86)

In keeping with the rule of thumb (bipolar voltage = 5* .. to 25* the
motor voltage rating) it seems this is quite a range, but should bracket
your requirements.

As the stronger motors are more expensive (and you are on a budget), find the
theoretical torque you need then buy the motor that gives at least that torque!

regards
Doug Fortune
http://www.cncKITS.com