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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