19 Jan
2009
19 Jan
'09
1:43 p.m.
On 19/01/2009 04:23, Mike Loewen wrote:
I'm in the process of rejuvenating an IBM model 29 keypunch, and a
couple of areas have some sort of oxidation on them. The card drum is
the worst:
http://sturgeon.css.psu.edu/~mloewen/CardDrum.jpg
The steel parts are fine, but the rest has a white material over most
of it. I'm not sure what sort of metal it is, looks a bit dark for
aluminum but the white material looks similar to aluminum oxidation.
What's a good approach to cleaning it up?
It looks to me like Mazak, which is a zinc-aluminium (and sometimes some
magnesium and copper) alloy used for die-casting. You could try steel
wool or a wire brush but I would bet it's badly pitted and probably
needs machined.
--
Pete Peter Turnbull
Network Manager
University of York
