I realized that what I said sounds kind of ambiguous. What I mean is
that I bought a cabinet, and then found those gages. I did not mean
that I pulled gauges out of a cabinet that did not belong to me.
If you have large outside micrometers that you want to calibrate, these are
what you would need. In principle, you could use them to precisely measure
large inside gaps if used along with a set of gage blocks or feeler gages.
Personally, if I am measuring large things, I do it with a height gage on a
granite table. I would sell these.
Uses that I see for them:
1) Calibration standards for zeroing larger micrometers. (I
presume that these are integer number of inches long.)
2) Fit into a V groove to serve as an extension on measuring
table motion. (This sort of thing was used in a precision
version of a light duty mill called a "Jig Borer" to eliminate
errors in leadscrews.) There would be a projection from the
moving part of the table which would hit the spacers in the
V-groove, and a precise dial gauge at the other end with a 1"
travel. Build up a stack of these to handle the integer length,
and a micrometer thimble which adjusts the remaining fractional
inch part and you can position the table very precisely.
The spacer rods and the double-ended micrometer thimbles came in
wood cased sets. I've got one of these sets for a Pratt &
Whitney jig borer IIRC. They had larger diameter rings to
support them at the proper center height. Yours look a little
smaller in diameter -- and the black rings are likely hard
rubber to insulate the rods from the heat of your hands, which
can otherwise introduce error.
You could set up something like this for verifying the
scales/encoders in your CNC mill.
It might be intersting to see what lengths you have there.
The visible ones look like about 12-14" length at a guess. And what is
(roughly) the diameter of the rods?
If they're for setting micrometers, they're "standards". Would be
integer inch(or cm.) lengths. If they're for setting snap gages,
you'd have max and min pairs. Could be any length then. From the
looks of them, you'd need to be overhauling locomotives to use
micrometers that large.
If there are that many standards on the loose, what happened to the
Depending on what you mean by HSM shop, probably. I'm the local detail
draftsman here, and I've had occasion to use the shop's gages, which
we call "ID gages," to detail a sample part that the customer wanted
If you ever need to measure the ID of anything to a thou or so, they're
worth hanging on to, in my humble, probably not qualified, opinion. :-)
My mic's go up to 6", that is expensive enough material to turn. :)
"Additionally as a security officer, I carry a gun to protect
government officials but my life isn't worth protecting at home
in their eyes." Dick Anthony Heller
Most of our work is large diameter parts, large meaning from 12 inches
up to 84 inch diameter turning. I am missing a couple of setting
standards on my larger mikes and would be very interested in them if
they are the ones I am missing. My mikes measure up to 36 inch diameter
and for biggier diameters I use Pi tapes or vernier calipers.
I think i am missing a 17 inch in one of the mike sets and a 23 in one
of the other. It's not a big problem since I have only one missing in
each set and I can use the next up or down rod to set the mike.
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.