Re: Max stepper motor speed - rpm

I have read the Gecko white papers. Very good info!
I have several ball screw catalogs and they all have some great drawn
out examples of how to calculate ball screw factors. At my previous
job I had created a spread sheet from a old Fortran program that sized
a drive system. Amoung many things it included screw max loading,RPM
and bearing L10 life calcualtions. It was all setup for screws that
were around 65mm dia and big servos that weighed around 100 lbs. I
should try and find it again and make it more generic and maybe post
it for the group. I has been a few years since I looked at it.

Thanks
Scott

--- In CAD_CAM_EDM_DRO@yahoogroups.com, John Johnson <johnatl@m...> wrote:
> There are several good white papers at
> http://geckodrive.com/support.htbml
> Also if you have the Nook industries catalog, there is information about
> the "critical speed" for the screws that Thom mentioned.
>
> Let us know if we can help further.
>
> Regards,
> JJ
>
> On 12-Aug-2005, at 14:47, Scott Riddle wrote:
>
> > I am looking at setting up a CNC router and I am starting to size
> > components like the ball screw and its pitch along with the stepper
> > motor speed and torque needed. One question I have is how to determine
> > the max rpm you can get out of a specific stepper. There are basically
> > 3 parts, the power supply, driver, and motor. Assume that the power
> > supply is sufficient how do you calculate the max rpm capability from
> > the driver? Say I start with a Gecko drive that has a freq=200kHz and
> > it is a 10 micro step drive and the motor os 200 steps per rev. Would
> > it be 200,000/(200*10)= 100 steps per second. Times it by 60 to get
> > 6,000 RPM. So the drive is capable. Now is the motor. Would you just
> > have to look at the speed torque curves and see for the desired torque
> > what speed you can run at? Is there some way to determine this if you
> > do not know the Mfg of the motor?
> >
> > My main reason for this question is that I am thinking of buying a
> > stepper that puts out around 600 Oz-in torque and direct couple it to
> > my .200" pitch ball screw. This would give me good speed capabilities
> > when routing on wood. I am trying to avoid to have to add the extra
> > complexity of a belt system.
> >
> > Thanks
> > Scott
> >
> >
> >
> >
> >
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