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Micrometer thread form

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Rick O Shea:
Thanks for the comments so far , I am moving to the idea that is is a special fine whitworth 40tpi thread? but I am still searching for  authoritative confirmation.

any more information would be very welcome.

Mike

DMIOM:
Mike - if you haven't already, it might be worth searching the patent & reg. design databases in case it is mentioned there?

Dave

leg17:
 :proj:
--- Quote from: Rick O Shea on November 04, 2016, 04:42:17 AM ---Hi All I know that most imperial micrometers have a 40tpi thread but what is the thread form? can any one offer any advice.

--- End quote ---

Curious.
What are you up to?
Going into the micrometer repair or manufacture business?

Rick O Shea:
I suppost I have become a bit fascinated by them, they don't need batteries are very accurate and are pretty cheap. I quite like working on old precision equipment. I am a clockmaker but also repair old speedometers  as my day job, and so a possible adjunct to my day job might well be the restoration and repair of micrometers. However I am also interested in making and as I can't find a vertical micrometer or and instrument makers micrometer I am planning to have a go at making one or more....

does that make it any clearer?

best wishes

Mike

seadog:
I've just checked the thread on one of my Imperial micrometers. It is definitely a Whitworth thread form.

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