Re: [CAD_CAM_EDM_DRO] helical couplings

At 23:25 12/06/2003 -0500, you wrote:

> >Folks,
> >what is a reasonably priced source for helical couplings?
> >I'm looking for one with 1/2"ID on one end and 5 mm ID on another end.
> >
> >
>For odd size conversions, you need to buy the closest stock coupling and
>bore it out to the needed size. You might have to start out with a
>1/8 - 1/4" unit or something like that. You might also need to make
>a bushing to adapt a 1/2" - 1/2" unit, because of the great size difference.
>These are pretty expensive no matter where you get them.

Might be worth trying an Oldham coupling. These come in 3 parts - two
bosses & a torque disc that sits between - & the bosses are available in a
number of bore sizes. See:

http://www.huco.com/

The diagram directly below "Welcome to Huco" illustrates an Oldham
coupling. These are also generally cheaper than helical couplings - Huco's
25mm diam Oldham couplings work out at around the £10 mark ($16).


Regards,
Tony