Tesa Internal Micrometer – stripdown

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Tesa Internal Micrometer – stripdown

This topic has 5 replies, 3 voices, and was last updated 19 July 2020 at 22:41 by Duff Machinist.

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19 July 2020 at 19:38 #486603
Duff Machinist
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@duffmachinist36701
Howdo all,

I have a Tesa Imicro internal micrometer (example pic below) which is new old stock (bought 'second-hand' ). While it's new, it hasn't been used since it left the factory yonks ago. Presumably this is why the thimble feels a little graunchy. I therefore need to strip it down and clean it. I can see that the end-cap over the ratchet screws off with a two-pronged tool, but I'm not sure what lies beyond.

I've googled, etc., but I've not been able to find an exploded drawing of such a micrometer let alone a strip-down tutorial. Does anyone know of a link, or say what I need to be aware of when I get started?

Many thanks.

Cheers,

Duff.

Example of Tesa micrometer what I've got

Edited By Duff Machinist on 19/07/2020 19:39:04
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19 July 2020 at 19:38 #19875
Duff Machinist
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@duffmachinist36701
Needs an internal clean
19 July 2020 at 20:29 #486617
JohnF
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@johnf59703
Hi if you have the two keys/spanners for adjustment or fitting the extension piece then you can remove the head with the probes and from memory part of the spindle can be removed then the thimble screws out — from memory only ! I have a similar set branded with another name and many years ago dismantled them for cleaning — mine were ex industry and not been loved !

However if yours are as you say new old stock I would first lubricate them with clock oil — I use this because it has less tenancy to congeal. I acquired a small set [275-500] at the ME exhibition that were in superb condition but a little gritty all I did was lube them and they were fine

Hope this helps

John
19 July 2020 at 21:24 #486627
Former Member
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@formermember32069
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19 July 2020 at 21:27 #486628
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19 July 2020 at 22:41 #486634
Duff Machinist
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@duffmachinist36701
Posted by JohnF on 19/07/2020 20:29:28:

Hi if you have the two keys/spanners for adjustment or fitting the extension piece then you can remove the head with the probes and from memory part of the spindle can be removed then the thimble screws out — from memory only ! I have a similar set branded with another name and many years ago dismantled them for cleaning — mine were ex industry and not been loved !

However if yours are as you say new old stock I would first lubricate them with clock oil — I use this because it has less tenancy to congeal. I acquired a small set [275-500] at the ME exhibition that were in superb condition but a little gritty all I did was lube them and they were fine

Hope this helps

John

Posted by Barrie Lever on 19/07/2020 21:27:21:

Duff

I am with John on this one, get some lube into the thimble, maybe immerse that end in some parrafin and if it feels better then get some oil into the thimble area.

One thing is for sure if it is NOS it will have a silky smooth feel once sorted out, I have started to switch over to Swiss micrometers, they are so nice if unabused.

B.

Thanks John and Barrie,

Unfortunately It didn't come with tools (or setting ring for that matter ), but can make a tool to unscrew the top. I'll let it be known what happened if anyone in the future has the same problem.

Barrie – yes, I was an early convert to Swiss measuring instruments in general. It takes a while to accumulate 'as new' micrometers but definitely worth it.

Cheers,

Duff
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