Re: Souces of Timing/Drive Pulleys

Hello,

The fenner "trantorque" uses a smooth STRAIGHT bore in the pulley. It
is a collet-like device (er type), but unlike a collet, it expands
its' OD WHILE contracting its ID. OK, it is really like TWO collets;
one inside the other(like a 5c inside an ER. The nut on the 5c part
pulls it into the er). In this fashion it takes up the space between
the two parts, with high force and good concentricity.

The type I outlined making for yourself (earlier post) will work as
well; and are MUCH easier to make.

Hope this helps.

Ballendo

--- In CAD_CAM_EDM_DRO@y..., Hugh Currin <currinh@O...> wrote:
> John:
>
> I suspect they are the same function but different mfg. The ones I
meant
> are small and have no keyway. A good picture at:
>
> http://www.fennerdrives.com/
>
> The Transtorque GT ones.
>
> I'm familiar with QD bushings which function the same way but are
part of
> the pulley. One taper is cut in the pulley and the other on a
keyed, split
> hub portion. They are pulled together by bolts. Are these what
you are
> thinking of? If not, my knowledge is exhausted.
>
> Hugh Currin
> Klamath Falls, OR
>
> At 10:27 PM 5/19/01 +0000, you wrote:
>
> >Are we talking about the same things?
> >The original Fenner Taper lock is quite cheap, has a keyway cut in
> >the insert and can be used on shafts having a quite wide tolerance.
> >In fact that's what they were originaly brought out for. They can
be
> >used on a shaft up to 0.010" under size and still lock up. I've
seen
> >these fings fitted to large generators with shafts like plowded
> >fields and they have still gripped and driven.
> >
> >john Stevenson