Are ceramic rotors generally available or is this thread about a specific application?
If it's backwards, you would find something to disagree with here:
Quote:
https://en.wikipedia.org › wiki › Cryogenic_hardening
Cryogenic hardening - Wikipedia
Cryogenic hardening is a cryogenic treatment process where the material is cooled to approximately −185 °C (−301 °F), usually using liquid nitrogen. It can have a profound effect on the mechanical properties of certain steels, provided their composition and prior heat treatment are such that they retain some austenite at room temperature.
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Temper first and the machining should/will have less chatter.
I will have more data soon[-ish]. The car is at the shop and he will pull a rear drum and inspect it, The picture at Permalink #4 is from 2015.
The point with the gas cans is they can run full, empty or without, depending on circumstance. Usually, it's full in the right to balance the driver's weight.