What Did You Buy Today?

Ben17484 said:
And what I hope and believe to be a thread measuring mic (someone please confirm that!).

d97847f88a4ef0f1c2bc3b2a15a110ce.jpg


I assume to use this, you measure the entire threaded bolt using a regular mic, measure using this mic and then minus one from the other to get the depth of the thread?
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Not sure what that micrometer is.
The spindle end seems to be flat (and carbide faced?).
I can't tell what the anvil end is except it doesn't seem to be flat.
We need more pictures that clearly show the anvil (at least).

A thread micrometer is used to measure the pitch diameter and has a V anvil and a Cone spindle end.
Details of the V and the Cone are different for different thread pitches.
In other words, one thread micrometer (single set of V and Cone) is intended for a limited range of thread pitches.
Then of course, there are different V and cone requirements for 60° thread forms vs 55° thread forms.

I've not previously heard of the procedure you described for measuring threads.
It may be a ChiCom plot to screw up manufacturing in the rest of the world. :grin:
 
extropic said:
Not sure what that micrometer is.
The spindle end seems to be flat (and carbide faced?).
I can't tell what the anvil end is except it doesn't seem to be flat.
We need more pictures that clearly show the anvil (at least).
Click to expand...
Curiously, I have a not too different Starrett #436 0-1” that I picked up in a box of “used Starrett micrometers” on eBay last year:

IMG_6396_Radiant_Photo.jpeg

It has a carbide anvil carefully ground to a flat Vee, and a conical pointed spindle, the end of which also appears to be carbide. It is an older style micrometer. The workmanship is too good to be anything other than factory made.

My contact at Starrett was intrigued, and thinks it might be a factory special, made to a customer’s specifications (Starrett apparently does this frequently). I haven’t figured out what to use it on, but definitely keeping it as a collectable.

Perhaps @Ben17484 can take somewhere and the the Chinese characters translated?
 
@ChazzC

I don't understand what a "flat Vee" is and the picture doesn't make it clear to me.
A close-up picture of the anvil might be the easiest clarification.

Does the cone on the spindle seem to be either a 60° or 55° included angle? If not, please estimate the angle.

I certainly can't argue with the Starrett rep.
It could well be a "Special".
I'm guessing the case pictured is pretty close to a century newer than the mic.
 
extropic said:
@ChazzC

I don't understand what a "flat Vee" is and the picture doesn't make it clear to me.
A close-up picture of the anvil might be the easiest clarification.

Does the cone on the spindle seem to be either a 60° or 55° included angle? If not, please estimate the angle.

I certainly can't argue with the Starrett rep.
It could well be a "Special".
I'm guessing the case pictured is pretty close to a century newer than the mic.
Click to expand...
Didn’t mean to imply this micrometer is for measuring threads; since there is no offset between the Vee & point it wouldn’t work.

Flat Vee: the end of the Vee is a ~ 1mm flat, not a knife edge.

Point is compound, like a prick punch; maybe 20 degrees for most of the length and a short end that is 30-ish?

Micrometer came without a case, I have a variety of these plastic NOS cases. Best guess from Starrett was that the micrometer dates to 30’s to 40’s.

For what it’s worth, it reads 0.000” when the point touches the flat.
 
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woodchucker said:
@wachuko Jamie, you made me do it..

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:D

I must have a defective case…. I tell you… I organize them, close the lid… if I turn around to walk away and quickly come back and open the lid…they are out of order…

Mine must have spend some time with 10mm sockets, but not enough time to learn how to disappear, just learned to scramble…

They are at the house in Orlando or I would have replied with a video!!
 
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