Strange micrometer

[Hossfly]

Found this mic in an old fellows tool crib. Was solidified. Said could have it[emoji3]. Has sharp points where you measure. Soaked in aerocroil overnight. Still frozen, got barrel off and warmed up with small heat, completely disassembled, now is running good. Able to set “0” very smooth. I think some type of thread gauge maybe?? Only goes to .000 no veneer scale for .0000https://uploads.tapatalk-cdn.com/20181113/744677b3dc4b7c744288cdfb1d2630ce.jpg


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[jimkim]

It's a thread mike. It should have the pitch range written on it.

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[Nobade]

Does the anvil have two points? If so it's a thread mic. Otherwise just for getting down into a groove to measure.

[Jackpine]

So you are saying that there was a micrometer in that picture. Guess I better go back an look again!!

[M-Tecs]

not a true thread mic since it does not measure pitch diameter , but they do make 60 degree point mics to be used as comparators http://www.starrett.com/metrology/product-detail/210AP

[Hossfly]

Scherr-Tumico.inc. St. James Minn. USA on barrel under crud layer. Anvil point has a screw in end maybe some type of changeable point? May be just some kind of comparator like M-Tecs said.

[brass410]

brake rotor mic to determine depth of scoring of both friction surfaces. If to deep don't bother to machine just toss from good old days when rotors where thick enough to machine now theyre just toss.

[Hossfly]

Now that makes since. The two points would work on both sides of disc. May find someone who needs it, doesn’t seem to work very well in measuring lead boolits tho because it cuts into lead. Will measure groves, with a light touch tho.

[M-Tecs]

Brake rotor mics have a deep throat https://www.matcotools.com/catalog/product/RMC10B/BRAKE-ROTOR-MICROMETER/

[mdi]

Does the anvil have two points? If so it's a thread mic. Otherwise just for getting down into a groove to measure.
Yep, I've had both, Not sure of the proper name as we just called them "Point Mics". And don't store it with the anvil/spindle touching. Back the thimble off some. Soaking in Ktoil will help clean it up...

[brass410]

Brake rotor mics have a deep throat https://www.matcotools.com/catalog/product/RMC10B/BRAKE-ROTOR-MICROMETER/
I have both shallow and deep they both have one side removable anvils theres even a extra deep for HD applications

[redhawk0]

Also can be used to measure the wall thickness of pipe.

redhawk

[Hossfly]

Yep this old guy was around a lot of pipe welding. Chillers and boilers.


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[redhawk0]

I have a scherr tumico micrometer that has a single rounded anvil. It says right on the box that is for measuring pipe walls. If its a flat anvil you can't measure off of the inner curve of the pipe accurately. The anvil center will be bridged by the inner pipe wall. The set you have with the two points also eliminates that bridging.

redhawk

[Mitch]

point mic just as mentioned above.can be used for anyplace you cant use a flat mic.i use them for sheet metal stampings in hard to reach places

[jimkim]

I can't see it that well. If it looks like this, it's for threads. https://uploads.tapatalk-cdn.com/20181114/889fb0560a6d3e246634b3a9522f8cdb.jpghttps://uploads.tapatalk-cdn.com/20181114/7d27f7d42c1ee0115986e45ffcc69f57.jpg

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[Hossfly]

Thanks jimkim that’s a good pic. This one has pointed on both anvil and spindle, it
May at one time had thread adp parts for anvil and spindle but long gone now. Got
It working good now will use it for point mic, has good clutch for tightening, but for
Lead you have to have a soft touch, as the points will punch in and give false reading.
Works good on grooves if your careful.

[Dragonheart]

Nice find and like so many things, it doesn't matter what it did, it can be repurposed. All you have to do is come up with what you can use it for.

[WheelgunConvert]

Thank You to all the respondents. I learned something that I couldn’t even know how to start to ask.
Sadly, the experience and expertise of the tradesmen is fading. Someday someone is going to have to make some parts to fix a CNC unit, but a qualified professional won’t be around.