5 Mar
2007
5 Mar
'07
7:20 a.m.
From: "Chuck Guzis" <cclist at
sydex.com>
On 4 Mar 2007 at 10:42, Chris M wrote:
Hi
I do know that Shugart used a poor quality pot metal on
the hub a floppy drive. I've only see it once but I've seen it a lot
on older radios. It is easy to spot, the metal is all expanded
and crumbles.
I'm told that it is caused by aluminum contamination. It seems
that aluminum doesn't alloy well. It tends to accumulate at the
crystal boundaries. When it oxidizes, it causes that typical
look of cracks and expanded metal.
Dwight
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Dopey question I guess, but was there anything
in the
way of a standard alloy used for drives? Was it more
aluminum or more zinc?
I have no idea. Some of the standard diecasting alloys can be found
here, but it wouldn't surprise me if some of the manufacturers
"tweaked" the composition a bit:
http://www.kineticdiecasting.com/tech.html
Heck, I can't get the straight scoop on some brass alloys that I use.
Apparently, there were bits and dabs of "additives" that were
considered to be trade secrets.
Cheers,
Chuck