RE: [CAD_CAM_EDM_DRO] which steppers to buy?

Ok Group every one is saying to use at least a 200oz
stepper .I called Smithy and asked then what they
would suggest stepper s for the 17X20 3 in 1 they sell
I was told that a 150 oz stepper and a 3:1 timing gear
now I am confused is this rating they say too small I
do have these stepper s now. I thought I should give
them a try just for the heck of it . Am I looking for
trouble using a small stepper I know that I can not
get any real speed out of them , but going slow I
think may be go till I learn more.


John


--- Tim Goldstein <timg@...> wrote:

> Don't worry about the stress on the Gecko, just use
> a good heatsink. They
> are designed to be useable at the full rating and
> from my experience with
> Mariss if he says it is capable of 80 v @ 7 amps it
> will be rock solid
> reliable at that rating.
>
> You will get much better rapids from the 6 amp 2.1 V
> motors and the low end
> torque will be identical. The Gecko white paper
> addressed suggested supply
> voltage and if I remember correctly about 25 X is
> the recommendation, but
> best to double check.
>
> Tim
> [Denver, CO]
>
> > -----Original Message-----
> > Hello again all, I am now ready to purchase the
> stepper motors for my
> > bridgeport cnc conversion. Looking at the mendonet
> site, I have
> > selected the nema 34's 720 oz. at $247.00 each.
> Now for my question;
> > the motors are listed as either 2,4 or 6 amps. The
> 2 amp motors are
> > listed at 5.4 volts, the 4 amp at 2.8 and the 6
> amp at 2.1 I am
> > running a 72 volt power supply from Bill Griffin,
> with Gecko drives,
> > and am using the AH-HA CNC Pro software. (also
> from Bill) Since I
> > have such a high voltage power supply, can I use
> the 2 amp motors
> > (higher voltage) and put less stress on the
> Geckos? What is a good
> > guideline for motor voltage versus power supply
> voltage? 10 times? 20
> > times? Thanks for all the help; John
> >
> > FAQ: http://www.ktmarketing.com/faq.html
>
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