Re: [CAD_CAM_EDM_DRO] looking for some gearheads

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