RE: [CAD_CAM_EDM_DRO] which steppers to buy?

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