Re: [CAD_CAM_EDM_DRO] looking for some gearheads

David, after re-reading my previous reply I guess I did sound a bit brisk.. I
appologise if toes were stepped on..

That being said, when someone is looking for these reducers
to fit a 34 or 42 NEMA, or a 90 or 115mm motor frame.. chances are
that they are looking for something to use in the drive side of a project

I'd sure like to find a worm drive w/ 10 arc seconds
of backlash.. I have a use for one, granted they are cheaper than
the planetary reducers and harmonic drives I was going to buy. :-)


Best

Jarrett

> Jarrett
>
> Sometimes not giving enough information can make any advise
> poor. What if these are for spindles where the slop doesn't
> matter as much?
>
> All gear drives have some slop, antibacklash drives compensate for
> it, but apply enough force and the slop reappears.
>
> If you had a worm reducer with an output uncertainty of 10 seconds
> of
> arc, would that be horrible or great? How about 10 minutes of
> arc? How about 10 degrees of arc?
>
> For a spindle, 10 degrees would be acceptable, but not for a
> rotary table.
>
> At 11:01 PM 7/28/2007, you wrote:
> > > >I need a couple of 90 degree gearheads,
> > > >I can use ratio between 7:1 to 15:1
> > > >frame size 34 or 42 or metric size 90 or 115
> > >
> > > While not exactly "off list", take a look at www.surpluscenter.com
> > > in
> > > their "power transmission" "gear reducer" section.
> > >
> > > They are not cheap ($100-$200 for smaller ones), but you might
> > > find
> > > what you want. This is of general interest, or it would have been
> > > off list.
> > >
> > >
> > > David G. LeVine
> > > Nashua, NH 03060
> >
> >Don't use these, you'll just be wasting you money. None of them at
> >I could see on the four pages listed are precision reducers..
> only use
> >these if your looking for lots of backlash for your system..
> >Search ebay for Precision Gearhead Planetary... you'll get several..
> >be patient.. I've bought 3 thompson 10:1 34's for $75 ttl off ebay...
> >there are deals if you are careful and patient..
>
> David G. LeVine
> Nashua, NH 03060
>
>
>
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