Help Identifying micrometer

[Raphael GolezParticipant @raphaelgolez]

Hi to all, I would like your help in identifying this micrometer. I have looked into a lot of on line search. The closest I got is the Etalon Microrapid Micrometer but there are subtle differences such as the spindle lock mechanism which is in different location and on this micrometer in looks to be broken and not moving (please see pictures) and the other difference is its a 0-1 inch. It is vintage and its functioning ok. It measure spot on on my gauge blocks and compared to my Mitutoyo Quantum Micrometer it is acceptable. This is my first Imperial Micrometer. I bought this to help me understand how to read this vernier type scale. I was wondering what brand it is as the name on the plastic protection is totally faded. It is a nice vintage tool that I really like. Hope somebody here can shed information on this and thanks in advance.

Raphael

 

 

 

 

Edited By RAPHAEL VAL GOLEZ 1 on 05/03/2020 12:19:37

Edited By RAPHAEL VAL GOLEZ 1 on 05/03/2020 12:20:19

[Raphael GolezParticipant @raphaelgolez]

[peak4Participant @peak4]

From your description of the differences, I'm guessing you may already have seen this.

Pages 64 & 65 of this link  a bit of a cross between items 170 & 171, so maybe variants depending on the customers requests

Looks like the 226 might be the current version, but sit down before you look at the price. 

Bill

Edited By peak4 on 05/03/2020 12:36:08

Edited By peak4 on 05/03/2020 12:39:54

[Raphael GolezParticipant @raphaelgolez]

Thanks for the link Bill. Yes the "feel" for this micrometer is very different, very smooth and precise despite how it looks its still very good. I have cleaned it gently with alcohol and now grit free. It is very easy to read the timble scale actually. I was surprised at that price, maybe it is because its a newer model though mechanically and functionally it looks and works exactly the same. Is it really that expensive?

Edited By RAPHAEL VAL GOLEZ 1 on 05/03/2020 12:55:46

Edited By RAPHAEL VAL GOLEZ 1 on 05/03/2020 12:56:24

[Raphael GolezParticipant @raphaelgolez]

The link you gave me Bill is very informative. I was reading through the page you gave me and get to know this mic better. It could be a variant in terms of its main frame/body hence the different arrangement of the spindle lock. What is interesting is the 0-1 version was discontinued long time ago hence it is very rare to find. The metric version which is the only current production is also very expensive. I’m very thankful that I did not restore the paint otherwise I will loose the patina and the character of this micrometer thereby loosing its historical value. It is very nice and in clean condition. I’m also happy that this is the 0-1 micrometer. It will be part of my collection instead. Thanks again Bill for directing me to this information.

Raphael

[peak4Participant @peak4]

To rejuvenate an older thread, I've just picked up one of these, but the slightly different one with the lever lock as per P65 of the link I posted a couple of years ago.

Has anyone ever worked on one, as mine had a couple of oddities.
I'm trying to work out how to adjust/calibrate it.

The left hand sliding ring on the thimble has some rotational play, but I suspect there is a way to compensate for it, and the actual spindle seems half a turn out. There's a couple of small holes, on the sliding tenths ring, with pegs/screws on the periphery.
I do realise it's a double start thread, which is one of the things that confuses me, as when fully closed, the thimble goes beyond the zero mark.
It's almost like someone has adjusted it, without realising it's a double start thread.

Bill

[peak4Participant @peak4]

Just to complete this tale, in case anyone searches for it in the future.

It now seems to be working OK and gives repeatable readings to a couple of tenths.

The sliding ring, with the tenths vernier, is on a ball race somehow attached to the main thimble;.
It locates in a groove along the main body's tubular thimble housing, via an internal plastic washer with two opposed lugs, which is able to be expanded with a small hooked tool, in my case a dental probe.
This allows one to take up any rotational slack on the sliding ring.

As mentioned above, the main thimble is on a double start thread with a 100 thou pitch, so one full rotation moves 1/10", i.e. four times as fast to adjust as a conventional imperial micrometer, which is 25 thou per turn.
When re-assembling, it seems to be pot luck as to whether the mic reads zero or 50 thou out; if the latter, just unscrew again until you feel the thread jump to the other half.

The main outer sleeve of the thimble, with the 100 graduations slides on the inner threaded part to allow alignment with the 10 divisions on the main body.
It's adjusted by screwing in a threaded plug down the end of the thimble.

I made an adjuster/plug out of brass hex, 7mmx 0.5mm pitch external, and drilled/tapped M4 threaded internal, so I could use a spare Allen screw I had in stock; I dropped a small ball bearing down the hole to act as a point contact.

With suitable padding and a small G clamp, the outer thimble sleeve could be slid inwards slightly too far, and then adjusted back to the correct position with the threaded plug.

The fine adjustment is the inner sleeve on the main body which rotates with a conventional micrometer C spanner.

It seems the imperial ones are no loner made and quite sought after.
Metric are still available, but the price is a bit scary, at about €500
https://trabiss.nl/shop/tesa-etalon-microrapid-226-micrometer/

See also this pdf for comparison with the TesaMaster, which seem to be priced as POA, so also probably beyond most of us new.
https://kyocera-unimerco-assets.com/api/DataSheets/TESA_C4_en.pdf

Bill

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