Re: small 3-axis micro stepper

Hi J.

The 253 oz-in motors should be fine if you are using 2:1
or greater belt drive reduction. Direct drive may work
but you will have to be careful of drag from mis-adjustment
of gibs and other friction loads.

The 20x voltage factor represents the upper end of the
range, as needed for best speed performance. Adequate
performance can usually be acheived with a supply voltage
of 5x the motor rating when using bipolar drivers. The
PacSci motor is rated to have 3.496 volts at 2.3 amperes,
so it will result in a 10x voltage factor, not bad. You
may not get the 60 IPM rapid, but do you really need it
with a table with only 11 inches of travel?

The Allegro chips will require attention to cooling to
run at 2.5 amperes, plan on using the fan.

Regards,
Steve Stallings
www.pmdx.com

--- In CAD_CAM_EDM_DRO@y..., J <jaredts@y...> 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
> Do I have any choice but to buy a high dollar cnc controller
(geckos are high dollar to me!)? The ideal system would be able to
make cuts with a router or milling head (cutting steel would be
nice), have a 60 i.p.m. rapid and cut at around 10 i.p.m. minimum.
By the way, xylotex suggested a nema 23 powermax II 253oz-in Bipolar
motor (2.3 amps bipolar series). Thanks for any replies.
>