Hi Kent,
What I know about material hardness can be pretty much written on the back
of a fag (cigarette) packet (hope that translate UK to USA ok!).
The bush sits in a steel housing which itself isn't fantastically
expensive. A bolt passes through the middle of the bush to clamp to another
steel
part.
Currently the wear is that the bolt isn't as tight a fit in the bearing as
I'd like due to a combination of average tolerances so I'm guessing over
time the bolt hole opens up and there's more free play than there used to be
along with an MOT/inspection fail.
I don't think that either Oilite or Phospher bronze can be readily heat
treated.
Regards
In a message dated 22/04/2012 20:18:31 GMT Daylight Time, cosmi
cmag1380 at gmail.com writes:
The different alloys that you mention can be made harder or softer
depending on the percentage of materials that you combine... Do you
have a particular BHN or Rockwell hardness in mind? The consideration
here is the parts that the bushing mates. A harder bush may damage the
other parts which, in turn, may be more expensive and/or difficult to
replace!
Have you thought about heat treating with water/oil cooling or
cryogenic treatment of the parts that you have? If the stock part has
not been treated in some manner, either process should give it extra
life. Water cooling a heated metal can increase it's BHN by a fair
percentage. Oven heat treating with water quenching does a really good
job of bringing the BHN up.
I have a freind who owns a tool & die shop. He now has every piece
that he makes cryogenically treated. He says that they last much, much
longer since he started doing that.
--
Kent
1960 Bugeye
1983 Garage full of spridget parts!
2010 Arrow shed full of excess spridget parts!!!
|