[gammanoles] Proper screws for Clover Mounting Flanges

[Samuel Tabor]

Thanks, Powell.
Sam
________________________________
From: Gammanoles <gammanoles-bounces at lists.fsu.edu> on behalf of Powell Barber via Gammanoles <gammanoles at lists.fsu.edu>
Sent: Tuesday, July 21, 2020 12:04 PM
To: FSU Physis Gamma Ray Spectrocopy Group <gammanoles at lists.fsu.edu>
Cc: Powell Barber <pbarber at fsu.edu>
Subject: [gammanoles] Proper screws for Clover Mounting Flanges

All -

While working on the clovers this go-round, I noted that some of the screws that were being used to mount the garnet, anodized-aluminum mounting flanges to the clovers were not correct.  Some were far too short, leaving only a few threads engaged, while others were not the correct thread.  As I understand it, these are used to structurally support the detectors, so it’s important to get these right.

The correct screw thread for these holes is a metric M5-0.8 (course) thread.  Unfortunately, this is so close to the U.S. size #6-32, that these can easily be substituted without one realizing it.  The #6-32 are smaller in diameter by about .010” and thus provide less thread engagement.

I will be replacing all of these and marking the dewars before they are sent back down.  Additionally, there is a plastic drawer in the Anneal lab with these screws clearly marked should you ever need to replace them.  THIS IS NOT A SIZE THAT THE SHOP ROUTINELY STOCKS, so if you need one, get it from the anneal lab.

Once again, the correct screw is an M5-0.8 x 14mm.

cheers,

p.

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