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Message ID: 3953     Entry time: Fri Nov 19 04:23:12 2010
Author: Suresh 
Type: Update 
Category: SUS 
Subject: Cleaned and stuck magnets to dumbbells 

To clean the glue off the magnets and dumbbells I soaked them in Acetone for about an hour and then scrubbed the ends clean with a lint free tissue soaked in Acetone. 

I then examined the ends under a microscope and found that while the flat faces were clean some of the grooves were still filled with glue.

 

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dumbells_before_ultrasonic_bath_2.jpg

dumbells_before_Ultrasonic_wash_1.jpg
 magnets_after_scrub.jpg magnets_after_scrub.jpg


While examining the magnets I found some small magnetic fibers stuck to the magnets.  Rana had mentioned these before as potential trouble makers which could degrade the high frequency performance of the OSEMs.

 Magnetic_Hair.jpg

 

To try and get the glue out of the grooves I put the dumbells through an ultrasonic bath for ten mins.  Most of the glue has been removed from the grooves.  Pics below

 

dumbells_after_ultrasonic_wash_1.jpg

dumbells_after_ultrasonic_wash_2.jpg

 

I proceeded try and recover the lost time by sticking the magnets back to the dumbbells.  Increased the quantity of the glue to a slightly larger amount than usual.  It should definitely squish out a bit now.  We will know tomorrow when we open the gluing fixture.

 

 

 

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