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.
