[time-nuts] repairing Maser threads

ernieperes at aol.com ernieperes at aol.com
Tue Apr 13 22:47:34 UTC 2010


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, 
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