Re: Keyways or set screws

You might also consider gib head keys. They are really old fashioned
but fitted well, they do not come off. They used to be used to fit
flywheels to the crank on agricultural diesels (Peter, Lister etc.)
and if they don't come off on these they wont come off on anything!
Problems start trying to get them back out later usually!

Mark


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Frank" <ftkalcevic@...>
wrote:

>
> > A tight-fitting key is very good.
>
> Is that hard to achieve? Will I be able to get a tight fit with a
> keyway broach? Does it take experience to use one properly? I

don't

> have a press, can a 9x20 lathe push a broach through aluminium?
>
> > High-torque servo motors can loosen
> > any setscrew, although installing two screws, one on top of the

other

> > has been a time-honored trick to keep them in place. Another

scheme

> is
> > to drill a dimple into the shaft where the screw seats. The best
> scheme
> > is locking collars or collet hubs on the pulleys, although these

can

> be
> > quite expensive new.
>
> Yes, I've seen them. Gates make the perfect set of pulleys I was
> looking for, unfortuantely the local Australian distributors don't
> stock the particular series - they said they would need to import

some

> parts from the US and the others from the UK - free shipping would

take

> 3-4 months, or I could pay $200 for air freight :(
>