Train wheel rim measuring tool - GIF

Train wheel rim measuring tool.

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Previously:

https://www.homemadetools.net/forum/...493#post193022
https://www.homemadetools.net/forum/...192#post126310
https://www.homemadetools.net/forum/...310#post185091
https://www.homemadetools.net/forum/...632#post182482
https://www.homemadetools.net/forum/...792#post178972

What what aspect of the wheel are they measuring?

Quote:

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Originally Posted by nova_robotics

What what aspect of the wheel are they measuring?

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This was my question too so I did some searching. While I could not find the exact product, apparently it is better described as a wheel profile wear measurement tool used in routine maintenance to measure things like:

Flange height
Flange thickness
qR—value
Wheel rim width
Hollow run
Double skin

(I have no idea what qR, Hollow run, and Double skin measurements are.)

Also, it looks like all the cool kids now use non-contact laser systems to do this same thing.

Pure guess; if hollow run is depression of wheel profile by crown of track, qR might be remaining usable radius.
https://link.springer.com/article/10...864-017-0072-2
Warning; the page bar is like a 1/4" high, ultra long page of text.
I'll await Cliff Notes, For Dummies book, or the movie.....

Double-skin? Well, that's best left to the baby boy's parents.....:rimshot::rimshot: