Re: [CAD_CAM_EDM_DRO] Z axis servo reduction gear

Oops, sorry your right. I didn't take the time to dig into it.. I see it now..
sorry :-/

Jarrett J.

> Actually that is the same equation. I split the efficiency out for
> later
> so your equation becomes:
> Force= [Torque x 2 x Pi]/ Screw lead
> screw lead is 1/TPI so the equation becomes:
> Force= [Torque x 2 x Pi]/[1/ TPI]
> Tidy up the divides:
> Force= Torque x 2 x Pi * TPI
>
> I always go for very pessimistic efficiency numbers to allow for
> dirt in
> the nut, wear and extra friction from bearings, slide ways etc. I
> also
> rounded the numbers down for the same reason.
>
> Les
>
> H & J Johnson wrote:
> > Les, just for the record I've been given a totally different
> equation
> > to calculate force from a screw.
> > Force= [Torque x 2 x Pi x Eff]/ Srew lead
> > F=lbs
> > T= in/lbs
> > Eff =x/100 or [0.xx]
> > Lead=inches
> >
> > In that instance w/ a delrin nut I'd think it would be at lease
> 30% efficent
> > 50oz-in = 3.13 lb-in
> >
> > f=[3.13 x 2 x pi x 0.3] / 0.10
> > f=60lbs
> >
> > Sorry to cloud the numbers
> >
> > Just thought I'd throw that out there anyway.
> >
> > Jarrett J
> >
>
>
>
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