Slocomb 2-3" Micrometer

racecar builder

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You're talking to the new owner of 1-2" range Slocomb micrometer.

Title of post is wrong. Can't change it. I was thinking ahead I guess.

Only one left to get is 2-3" micrometer. Might get a 3-4" for pistons.

At least I will be when it gets here.

Idea is to build a set for small engine project right now.

0-1" 1-2" and 2-3" set 3 micrometer set.

Harbor Freight ones are $39. Then you use 20% off coupon and they are about $32.

I noticed Made in the USA ones were going for about that on Ebay.

So I'm going for it.

Told a relative about building micrometer set and he is giving me a 1-2" micrometer

Which might turn out to be near a 100 years old!

Plus it was used by another relative.

A pattern maker in Philadelphia.
 
Last edited:
Ied probably want the 100 yr old one first , if it was calibrated.
 
i have a small collection of JT Slocomb mics, i have an affinity for their feel and construction.
they were very well made measuring instruments.
i find their accuracy amazing.
what blows my mind is that these fine instruments were made without modern equipment.
they can be recalibrated and go toe to to with more modern mics.
i brought back a dozen or better mic's back from the dead, Slocoms are my favorite.
i used gage blocks to calibrate my mics, you could do the same:)
 
Ulma Doctor!

Small world!

I was just looking for you!

Okay. It came in the mail today.

It feels like it is tightened up for shipping.

I do not want to damage it.

Is there a way to loosen it?
 
you can unscrew the thimble all the way off the mic and see if it is dirty/rusted and clean/adjust as necessary after that
you will need some mic spanner wrenches to avoid damaging the delicate structures inside
i have extras if you need wrenches
lmk :)
my email
ulmadoc@gmail.com
 
Mr Walton

It loosened.

It was tightened clockwise to ship it.

I noticed it was open about an inch.

That told me go ahead and twist it.

This is in very good condition. Unused even.

Fully tightened is about 2 hash marks before zero.

Is that correct? In adjustment?

Bob
 
you'll need to check the adjustment against a standard or gage block
for the 1-2" mic you'll need a 2" gage block to set the zero
for a 2-3" mic you'd need a 3" standard or gage block to zero, etc., etc.
 
Thank you Mike!

Found out this one is at 1" open zero when you

open it those two hash marks plus go around again.

Looks like 25 thousands you open it.

Measured it with Sears hobbyist Dial Calipers (another Ebay purchase).

Is that how my Slocomb micrometer is supposed to work?

Bob
 
they mic may go past zero. but not against a standard- it should hit zero against a reference.
if not you'll need to recalibrate.
i generally leave my mics slightly open in storage,
some old timers used tissue paper between the mic faces during storage
 
Thank you Mike!

Short answer. It does!

When it is all the way open like when I received it.

It is about 25 thousands and about 2 more bigger than 1"

Is that about right or does it even matter?

Guess it would need to open more than an inch so you get work between the 'jaws'.

Think I am distracted by the good condition it is in.

It is like it is unused!

Bob
 
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