Re: 9x42 conversion

Bridgport used nema 42 motors, and most people use this size...But
some have successfuly used nema 34...It depends what you have access
to or have laying around, or how much you want to spend...and what
kind of performance you want...

Most people use a gecko stepper driver.

http://www.geckodrive.com/

they are adjustable up to 7 amps...The current you should use is
dependent on you motor...

There is a gecko support group here...

http://finance.groups.yahoo.com/group/geckodrive/

The following is a general description of steppers to get your feet
wet...A few things you should know is steppers for the same frame
size can have very differnt torque and speed curves...In general a
stepper with the lowest nameplate voltage and highest current will
give you the best torque and speed...A 1.5v stepper is very good and
a 5v stepper is so so...

Also note that the stepper is not driven by it nameplate
voltage...You typically run a stepper 20X its nameplate voltage...So
a 1.5v stepper is run at 30vdc...The gecko drives can be run up to 7
amps and 80vdc...Gecko stepper drives need a external power supply
you have to provide...

I would suggest reading back in the archives in this group and geckos
at least 1 year to get a better handle on who, what were, when, and
why...I just got done doing the same...Lots of good stuff there, even
what software to use...


Wally



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Polaraligned"
<polaraligned@o...> wrote:

>
>
> Can anyone tell me what size steppers are the minimum required and
> also when looking for a stepper driver, what maximum current rating
> is needed to drive these steppers? The steppers will be driving

the

> leadscrews with a 2:1 reduction via a belt drive.
>
> Thank you,
> Scott