Re: Souces of Timing/Drive Pulleys

--- In CAD_CAM_EDM_DRO@y..., ptengin@a... wrote:

> In a message dated 05/19/2001 4:28:35 AM Hawaiian Standard Time,
> stratton@m... writes:
>
>
> > I'm not familiar with these hubs, but would think that they would
> > require a very precisely machined (ground?) shaft (okay, I know,

we're

> > _supposed_ to do that for the bearings anyway) and even then they
> > might still slip under high cutting or acceleration loads. If

your

> > encoder is upstream of the pulley system, wouldn't some sort of

pin be

> > safer?
> >
> > Chris
> >
> >
>
> Chris,
>
> Have played with those Fenner units too. They are very high

dollar and

> work really well. If they are installed per spec, they should

transmit any

> load the shaft is rated to carry. Since there is no keyway, I'd

think that

> fatigue cracking is easier to avoid. The shafting need not be

ground but it

> must be a good finish. Also, I think the diameter could be +- .001

in less

> critical applications. Sure beats cutting keyways.
>

Peter
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
Nottingham, England.