Re: [CAD_CAM_EDM_DRO] which steppers to buy?

And don't forget that a 3:1 reduction also potentially improves the
resolution (accuracy) threefold. This may not be strictly true, of course,
as inaccuracies in the drive belt may have a deleterious effect but this is
likely to be minimal where several belt teeth touch the pulleys at once.

Ian
--
Ian W. Wright
Sheffield UK
www.iw63.freeserve.co.uk

----- Original Message -----
From: "Jon Elson" <jmelson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: 28 May 2001 05:02
Subject: Re: [CAD_CAM_EDM_DRO] which steppers to buy?


> Jerry Kimberlin wrote:
>
> > marble here wrote:
> > >
> > > Ok Group every one is saying to use at least a 200oz
> > > stepper .I called Smithy and asked then what they
> > > would suggest stepper s for the 17X20 3 in 1 they sell
> > > I was told that a 150 oz stepper and a 3:1 timing gear
> > > now I am confused is this rating they say too small I
> > > do have these stepper s now.
> >
> > Isn't that the same as a 450 Oz stepper? If you gear the stepper
> > 1, and the screw at 3, that multiplies things, torque-wise.
> > Maybe 1-1 ratio and a 200 oz stepper is all that is needed.
>
> Yes, the 3:1 reduction triples the torque, but it cuts the speed
> (very roughly) to one THIRD! A larger motor and a smaller
> reduction ratio should be able to deliver higher speed, given
> a couple provisos. The driver and power supply need to deliver
> higher current to the larger motor.
>
> Jon
>
>
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