[time-nuts] repairing Maser threads

J. L. Trantham jltran at att.net
Wed Apr 14 08:56:06 EDT 2010


Another thought.

Can  you put a little solder on the threads of your bolts?  Probably good
for one installation then have to do it all over again if you have to remove
it.  What does it have to be torqued to?

Joe

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Robert Atkinson
Sent: Wednesday, April 14, 2010 7:40 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] repairing Maser threads


Hi Ernie,
You can get M5.5 screws fairly easily (in the UK at least) It's actually a
"cheat" size, almost identical to the old 2BA screw. 2BA was used in
electrical fittings and there were so many in use that a replacement was
required that fitted older fixed installations like junction boxes cemented
into walls. M5.5 screws are also found on many diecast boxes, usually the
"taptite" tri-lobular thread forming type.
 
Robert G8RPI.

--- On Tue, 13/4/10, ernieperes at aol.com <ernieperes at aol.com> wrote:


From: ernieperes at aol.com <ernieperes at aol.com>
Subject: Re: [time-nuts] repairing Maser threads
To: time-nuts at febo.com
Date: Tuesday, 13 April, 2010, 23:47



Hi,

you can not go step like 5.5 mm or so.... the best thing is to cut a new M6 
thread because it is the next most available screw size in metric..... I had
a lot of problem with the American size thread but the best solution was
always the next higher most common metric size......!!!!

Rgds Ernie.









-----Original Message-----
From: Charles P. Steinmetz <charles_steinmetz at lavabit.com>
To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
Sent: Wed, Apr 14, 2010 12:19 am
Subject: Re: [time-nuts] repairing Maser threads


Dave wrote: 

>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.

Unfortunately, 5 mm is the only standard metric thread with a 0.8 mm pitch,
so you'd need a custom tap and would need to make custom bolts. Hence, my
suggestion to just make some custom bolts in "M5.2x0.8" or "M5.5x0.8,"
whatever is necessary to get a tight fit. Same approach, but less work
(although if someone ever loses the bolts, they'll go crazy trying to figure
out what to use for replacements). 

What I didn't mention previously, but would be good practice if you went
that way, is to cut one straight flute on the bolts (look at a self-tapping
machine screw to get the idea) to make it easier for them to deepen the
major diameter of the original 5 mm thread. 

Best regards, 

Charles 



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