Re: 9x42 conversion

Thanks Wally. What I am looking for is the torque rating that is
sufficient to drive a full size Bridgeport mill. Is 1000 oz-inch
enough? should I go to a larger 1300 oz-inch?
As for the driver, I heard that the Gecko's barely had enough
current ability to handle driving motors on a large mill, plus
they are not overcurrent protected. I just want to know what
people out there are using sucessfully for Bridgeports. It is
a much larger and capable machine than a import Mill/Drill.
I will be using Mach 2 software.

Thank You,
Scott



--- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnc_4_me" <cnc4me@g...>
wrote:

>
> 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