The comments on the pattern left on the brake rotor started me thinking.
The "swirling" pattern, if its what I am thinking it is, is typical of one
left by a grinding wheel when the side of the wheel is doing the cutting,
rather than the periphery of the wheel. The mark left by a single point
cutting tool is actually a spiral, the pitch of which is detrmined by the
tools feed rate acroos the face of the rotor. After all these years of
having rotors turned (which, by definition, implies that a single point
cutting tool is used), I am wondering if, in fact, some so called "turned"
rotors are actually ground? Can anyone confirm this?
As an added kicker, a worn single point tool bit will "chatter", which will
leave a pattern on the face of the rotor that could be construed as a
"swirl". Maybe we are also seeing this?
-----Original Message-----
From: Wayne Brazinski <wbrazinski@mediaone.net>
To: triumphs@autox.team.net <triumphs@autox.team.net>
Date: Friday, August 27, 1999 10:05 PM
Subject: Turning Rotors
>Coincidentally(?), the marks left on the newly turned rotors are in a swirl
>pattern. Maybe there's something to your emery cloth idea.
>
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