[time-nuts] repairing Maser threads

Larry Snyder larrys at teamlarry.com
Tue Apr 13 15:38:21 EDT 2010


Without having had the benefit of seeing what you're working with,
this would be the way I'd lean as well.
-ls-



Dave Powers <dave.powers at att.net> wrote:
> Howdy Corby - 
> 
> just a couple of thoughts. I grew up in a machine shop and am an
> aircraft mechanic. 
> 
> If you haven't used them before, Helicoils require a larger hole to be
> drilled and tapped, because you basically install a large threaded
> spacer into the original location with the right size inside threads
> for your original screw. It takes a somewhat expensive drill & special
> tap and insert tool to complete.
> 
> Another solution - especially with metric - is to tap the holes ( only
> bad - or all - so that they all match) to the next larger Metric size
> - of the same thread pitch as original - so as not to cut across the
> original threads, but just cut the same thread pitch to the
> next size, such as from 5mm to 5.5mm or 6mm. Then you only have to buy
> a standard - not too expesive - metric tap - and some new slightly
> larger hardware.
> 
> You can also consider tapping the original holes to the next larger
> SAE - probably National Fine thread - but your new threads will cut
> across the original threads slightly.
> 
> It really depends on how much room you have to do the work - and how
> much strength you need -
> 
> Hope this helps
> 
> Dave Powers - KA0KCI
> 
> 
>  
> 
> 
> 
> ________________________________
> From: Corby Dawson <cdelect at juno.com>
> To: time-nuts at febo.com
> Sent: Tue, April 13, 2010 1:03:55 PM
> Subject: [time-nuts] repairing Maser threads
> 
> Hi,
> 
> It does not seem Time-Nutty but I need help repairing threads in a
> mounting hole.
> 
> 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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