[time-nuts] repairing Maser threads

[Don Latham]

Depending on the stress on the screw and how badly it's stripped, I would
consider some Loctite; especially if you only need to do it once.
Otherwise, Dave and Larry have it quite right.
Don

Larry Snyder
> 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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>
>
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-- 
Dr. Don Latham AJ7LL
Six Mile Systems LLP
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POB 134
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