Re: uh, Mariss, can you clear up my confusion ?

Dave,

Good evening! I think you are mixing apples and oranges here. It is
coincidence my example speed and yours are similar. I was thinking
about your problem when I read your original post but did not address
it because I needed more info. So here goes:

(1) What is your leadscrew turns per inch?
(2) What is your power supply voltage for the drives?
(3) What type drives are you using? Full-Step? Bipolar?
(4) What is the maximum speed you get before stalling?
(5) Is the motor under load at the time?
(6) What is your CPU speed?
(7) What is your motor frame size? 6-wire? rated phase current?
(8) What is your leadscrew diameter?

I have a hunch the reason for your problem will be simple and you
will be able to get much more speed than now.

Mariss

--- In CAD_CAM_EDM_DRO@y..., "dave_ace_me" <davemucha@j...> wrote:
> from post: 39596 Subject: Re: Gecko G201
>
> <sinp> (1) A full step drive needs 200 pulses to
> > turn 1 rev. A 10 uStep drive needs 2000.
> > A full step drive needs 4,000 step pulses per
> > second to turn a motor at 1,200 RPM, while
> > the 10 uStep drive needs 40,000 for the
> > same speed. Many cannot come up with the
> > higher step pulse frequency. <big snip>
>
>
> I was hoping I could get 4,000 steps per
> second on a standard stepper, alas,
> I knew that was too much to hope for.
>
> then <snip> > Maximum speed at 250 oz-in is
> > 360 full steps per second. On a 10 TPI
> > leadscrew this is an agonizingly slow 10.8 IPM.
> >
>
> this is more in what I had experienced,
> (actually 300 steps per second)
>
> Since I want to drive a 120 inch long lead screw,
> am I screwed ? that is roughly 12 minutes for a
> 10 ft travel. or if use a 0.9 deg per step,
> that would double to just over 23 minutes.
> now that is truly agonizing !
>
> what is a good solution ?
>
> How fast can you spin a servo ?
>
> Dave
> (wishing the laws of physics didn't apply
> to those of us in New Jersey)
>
>
>
>
>
>
>
>
>
>
> > Mariss
> >
> > --- In CAD_CAM_EDM_DRO@y..., "rsgoldner" <rgoldner@i...> wrote:
> > > Mariss, is this right? Given my three motors at 3V/4A phase
> driven
> > > by G201s do I need about 60V at 10A or 60V at 2A? Big
difference
> in
> > > cost!
> > >