[time-nuts] repairing Maser threads

[Steve Rooke]

I've had some luck in the past by cutting short lengths of braiding
from cable, inserting it into the hole, opening it out and running the
screw down that. Sort of works a bit like a rawlplug, the fibre or
plastic plug that you push into holes drilled in masonry walls and
then driver a screw into them. If you could find some steel braded
thin cable it would probably work even better.

Steve

On 15 April 2010 00:56, J. L. Trantham <jltran at att.net> wrote:
> 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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-- 
Steve Rooke - ZL3TUV & G8KVD
A man with one clock knows what time it is;
A man with two clocks is never quite sure.