Re: Tormach stepper motors

Nate,

The original equipment stepper motors were typically
900 to 1100 oz-in motors. The Z axis needs just a big
of a motor as the X and Y due to the forces required
for drilling with large drill bits.

You may have weak motors. Unfortunately the original
motors could be de-magnetized partially by over current
and the Bridgeport drivers were notorious for failing
with shorted transistors that dumped full power supply
current into the motor.

If you do decide to use 1200 oz-in modern NEMA34
motors, remember that as far as the Gecko driver is
concerned they act much like a NEMA42 with regards
to the jumper setting.

Regards,
Steve Stallings
www.PMDX.com

>
> I posted a while back trying to get rid of a retrofitted Bridgeport
> Boss 5 that was losing steps, but nobody seemed to want it. I've
> gotten a new(er) mill since then and still need to get rid of the BP,
> or at least get it working right. I'm running Gecko 201's with the
> original steppers, and I thinking that if I trade those out for some
> new steppers it will probably fix it. I'm looking at some from
> Tormach, I understand their mills are pretty good so maybe their motors
> are too. First I want to make sure the 1200 oz-in is the right size,
> maybe the 640 oz-in for the z and a axes. Also, how neccessary is it
> for them to be sealed against chips and coolant, they're not really
> positioned to get a lot on them anyway. Second they're about 25% off
> if you buy a case and I was wondering if anybody in the Southwest
> Missouri, or Tulsa area would be interested in splitting a case with
> me. Please email me directly if you would, no use cluttering up the
> forum with this.
>
> Thanks
> Nate
> rocketscientistnate@...
>