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What is a good rotor surface finish
Machined surface finishes are usually measured with "Surface
Profilometers." But for any given Rotor surface you can use a
Relative Machined Surface (RMS) measurement. For example:
- A # 125 finish = fingernail finish, your fingernail will drag on this finish.
- A # 63 finish = a smoother finish, your fingernail will not drag,
however you would be able to detect lines in the finished surface.
With the introduction of Anti-Lock Braking Systems, brake rotor
finish tolerances are more critical. Manufacturer's are now providing
surface finish specifications. They will specify, for example, a
brake rotor surface finish of 60 Ra or Less" where Ra equals
"Roughness Average."
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