Re: Stepper Motor size

The Camas software has that info for different types of lead screws
Frank

--- In CAD_CAM_EDM_DRO@y..., "M. SHABBIR" <shabm@d...> wrote:
> Hi how can we calculate lead screw efficiency??
>
> SHABBIR
> At 02:43 PM 10/3/01 +0000, you wrote:
> >Hi,
> >
> >A handy equation to convert in-oz torque to Lbs of "push" or thrust
> >on a leadscrew is:
> >
> >Lbs = (in-oz times 2pi times TPI times %) / 16
> >
> >Where TPI is leadscrew turns per inch and % is leadscrew efficiency
> >
> >If you have a 5 TPI leadscrew with 85% efficiency and a 2,000 in-oz
> >motor, then push is:
> >
> >(6.28 X 5 X 2,000 X 0.85) / 16 = 3,336 Lbs, or over 1.5 tons.
That's
> >a lot isn't it?
> >
> >Mariss
> >
> >
> >
> >--- In CAD_CAM_EDM_DRO@y..., karl@c... wrote:
> >> I'm looking for stepper motors for my second CNC mill. My
> >Bridgeport
> >> Series 1 has LARGE steppers. I don't have the specs. but I guess
at
> >> least 2000 oz/in.
> >>
> >> My second mill is a full size bridgeport type knee mill which
needs
> >a
> >> CNC upgrade. I'm using Ahha Artisan FWIW. The control uses 48
volts
> >> and needs 8 pole motors.
> >>
> >> Anyway, I'm looking for large steppers and can't find any. My
first
> >> question is what size do I really need? I do the conversion from
> >> oz/in to foot pounds and steppers seem really puny. For example,
> >540
> >> Oz/in. = 2.8 foot pounds. A typical power feed is 35 to 70 foot
> >> pounds.
> >>
> >> Anyone have a source for large steppers? Preferrably used, or at
> >> least inexpensive.
> >>
> >> Karl
> >
> >
> >Addresses:
> >FAQ: http://www.ktmarketing.com/faq.html
> >FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> >
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