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: [email protected] [mailto:[email protected]] 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, [email protected] <[email protected]> wrote: From: [email protected] <[email protected]> Subject: Re: [time-nuts] repairing Maser threads To: [email protected] 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 <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. = _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
