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Entry  Thu Nov 17 15:19:06 2011, steve, Update, SUS, Ti spring plunger to hold OSEM is not affortable 20111116111042405.pdfP1080216.JPG
    Reply  Fri Jan 27 09:05:41 2012, steve, Update, SUS, OSEM locking plunger 
       Reply  Fri Mar 30 10:24:14 2012, steve, Update, SUS, new OSEM locking plunger new_OSEM_locker_screw.jpgIMG_0109.JPGIMG_0111.JPG
Message ID: 6472     Entry time: Fri Mar 30 10:24:14 2012     In reply to: 6232
Author: steve 
Type: Update 
Category: SUS 
Subject: new OSEM locking plunger 



Our existing 300 series SS plungers from McMastercar #8476A43 are silver plated as Atm2 shows.

Problems:  1, they become magnetized after years being close to the magnets

                     2, they oxidize by time so it is hard to turn them


I looked around to replace them.

Titanium body, nose and beryllium copper spring. None magnetic for UHV enviorment.

Can be made in 7 weeks at an UNREASONABLE $169.00 ea at quantity of 50

 In order to get a better price from Vlier's Tom Chen I changed Ti body back to SS304L-siver plated and music wire spring. The price is still ~$120 ea. at quantity 50

I will talk to Mike G about modifying the  McMaster plunger with a hex nut.

 Conclusion: There is no need to silver plate the SS plunger at the torque level we hold the OSEMs

Mike Gerfen will be done with 50 pieces by April 4 and he will give them to Bob for cleaning. They should be cleaned and baked in a jig so the springs would be compressed for better venting.

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