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Etalon comparator micrometer

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Barrie Lever28/05/2020 13:57:56
567 forum posts
56 photos

I thought this micrometer might be of interest.


I have a project that I will start fairly soon to restore one of these micrometer's, it is an Etalon 225 Comparator micrometer.

These are very old fashioned but of the very highest quality, there is a conventional micrometer spindle on the right that measures down to 1/10 thou. So if for example you were comparing 20 shafts that were 0.500" diameter you would set the spindle to read 0.500".

To measure the parts you press the button on the left that causes the anvil to open and the part is placed between the anvils and the button is released, the moving anvil on the left then closes and registers the deviation from 0.500" and indicates this on the dial. Tolerance limits can be set on the dial by rotating small knobs that alter the radial position of the red and blue sectors.


I would really appreciate any comment or input about these micrometer's, I have another one and between the two I hope to assemble one really good micrometer.


Edited By Barrie Lever on 28/05/2020 13:58:57

Michael Gilligan28/05/2020 14:07:37
15665 forum posts
682 photos

I can only make the comment: What a beauty !

Sorry, I can offer no useful input at the moment



Got it:

Edited By Michael Gilligan on 28/05/2020 14:12:55

Jeff Dayman28/05/2020 14:10:16
1817 forum posts
45 photos

The Etalon comparator mikes are great instruments. We had a number of them in the toolroom at my first job in industry 36 odd years ago. The benefit is not just that they are great for repeat inspection, but like a bench mike the fiducial indicator system controls the measuring pressure and this greatly improves accuracy. Treasure that one! You are lucky to have it.

EdH28/05/2020 14:58:22
41 forum posts
27 photos

I have a couple of unusual micrometers, the adjustable one is by Starrett and has no model number and the smaller black one is a Cicerimet. They are not used but function perfectly though I haven’t checked them for accuracy.



Barrie Lever28/05/2020 14:58:37
567 forum posts
56 photos

Jeff and Michael

Thanks for your comments. I had forgotten to mention the benefit of the consistent measuring pressure as well.

I effectively 'won' this micrometer in a job lot of Digimatics that I bought, there was a 1 to 2" Digimatic that I thought would be useful for the collection if I could get it to work.

With a little bit of fiddling the 1 to 2" Digimatic and one of the 0 to 1" worked nicely so I ended up with two Digimatic carcasses for spares and the Etalon, whole lot cost me £40.00.



Barrie Lever28/05/2020 15:20:31
567 forum posts
56 photos


Both of those are interesting items. I will read up on the Cicerimet.


Barrie Lever31/05/2020 10:30:50
567 forum posts
56 photos
Posted by Jeff Dayman on 28/05/2020 14:10:16:

Treasure that one! You are lucky to have it.


I probably did not make it clear that the micrometer is non working, it is without the indicating needle.

So to support the restoration, I bought another one on Ebay for £40.00 thinking I would make a good one out of the two.

Well what a revelation this piece of equipment is, I cannot believe how good it is to use and how accurate it is along with the feedback that you can only get from an analogue instrument.

The repeatability takes some believing.

Here is the 2nd one bought on Ebay, tatty around the edges and a broken crystal but super accurate.




I might try and get both

ega31/05/2020 12:30:12
1694 forum posts
145 photos


This looks like your adjustable mic - cost a small fortune when new; illustration is from a 1900 Buck & Hickman catalogue:

starrett mic.jpg

JohnF31/05/2020 23:47:15
981 forum posts
142 photos

Here's one I got unexpectedly on Ebay for an absolute song quite a few years back, being 1-2" its use is limited but fairly recently I made a GO plug gauge for Myford spindle thread using 3 wire method -- long story as to why I needed this even of accuracy but its a useful tool to have. We used them regularly when I worked in industry.


Graham Titman01/06/2020 08:55:06
82 forum posts
10 photos

Looks similar but different make and needs some work.


Edited By Graham Titman on 01/06/2020 08:55:35

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