[time-nuts] repairing Maser threads

J. L. Trantham jltran at att.net
Tue Apr 13 22:26:01 EDT 2010

I am just getting home and have read all the replies so far.

Have you tried just replacing the bolts?  New bolts with new threads with
old hole and old threads may work better than the old bolts with old
threads.  It won't be perfect but might get you by.

Another option along the helicoil line is to bore a larger hole, tap it with
whatever, get a piece of tubing of the appropriate material and thickness,
tap the external surface to match your larger hole and thread and tap the
inside surface with the M5x0.8 thread.  Make a 'slot' in the end so you can
insert and remove with a screw driver.

This all depends on what the size, shape, thickness, etc., you have to work

Good luck.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Corby Dawson
Sent: Tuesday, April 13, 2010 1:04 PM
To: time-nuts at febo.com
Subject: [time-nuts] repairing Maser threads


It does not seem Time-Nutty but I need help repairing threads in a mounting

I recently installed a new ion pump in an EFOS2 Hydrogen maser and two of
the mounting holes (metric M5)

have damaged threads. 

The bolts go in fine but wont tighten and if you wiggle the bolt you can
pull it out.

I've looked at the various locktight and permatex stuff but am unsure that
they will do what I want.

I'm hoping someone has experience with these and can advise me.

What I hope will happen with the right product is that I apply it to the
threads, screw in the bolt until it just contacts the lock washer, wait
until the goop cures, and then 

tighten until the lock washer is compressed and the bolt is tight.

Just don't know what product to try! Want to be able to disassemble without
special tools or heating.

Any help is appreciated!

Corby Dawson ____________________________________________________________
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