Shugart 800-8 media centering problem

Jay Jaeger cube1 at
Sat Aug 15 10:37:29 CDT 2015

Certainly this thing is old enough.  But I don't see how it would ever
work if that were the case.

When the media is on center, it works flawlessly, including interchange
with another drive.

One thing I am going to try today is to manually center the media with
the AC power disconnected (not spinning), and then mount the clamp and
clamp it to see if it works consistently when I do that. I think it
will, and if so, then it would eliminate all of the sorts of suggestions
I have seen from folks so far.

On 8/14/2015 11:58 PM, dwight wrote:
> It could be an indication of pot metal failure.
> I had one drive that the spindle from the driven side was clearly
> swelling. I replaced it from a spare parts drive.
> What happens is that the metal has oxidation at grain boundaries.
> It is said that it is caused by small amounts of contaminating
> metals in the mostly zinc pot metal.
> Aluminum has been said to be one of the problem sources.
> Dwight

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