1 Jul
2014
1 Jul
'14
1:30 p.m.
On Jul 1, 2014, at 4:08 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
...
Bronze is often used for bushings. That may be specifically porous oil-impregnated
bronze.
The point about wear is a good one. Lapping (and polishing, essentially the same thing)
is done with a soft tool and abrasive dust. The dust embeds into the surface of the
softer of the two items (the tool) and cuts the harder of the two.
paul
An alternative material is brass. That part is affordable in small
quantities ($30ish for 1). It's still significantly softer than steel,
but friction and galling could be a problem.
I wouldn;t sue brass. It is not self-lubricating, it is goign to casue
wear. Incidentally, as any horoligst will tell you, if you have brass
working on steel (as in a clock where a brass wheel meshes with a steel
pinion) it's often the steel that waars away more quickly.
-tony