Noob to the subject. Green Monster I wonder if this could be some of my CLs shaking Anywho...

What is this "radial eccentricity" that EricL and others speak of? How can the average Joe know if his CLS is experiencing it?

Also the dial indicator gizmo. Used by SiGGy and others. Is this in most brake shops? Does it measure rotors while they are on the car?


https://acurazine.com/forums/showthr...l+eccentricity

https://acurazine.com/forums/showthr...l+eccentricity

The radial eccentricity he is referring to is basically the wheels not being perfectly flat against the hub.

The dial indicator gizmo is ?

no, radial eccentricity is the the wheel/tire not rotating around the centerpoint caused by a flatspot or highspot.

imagine a circle that rotates around a dot. now move the dot off the center of the circle. the circle still rotates around the dot but now "wobbles".

if the dot was centered but there's a hump or flatspot in the circle, this would also cause a wobble since the mass distribution around the center has changed.


a dial indicator is a measuring tool to measure misalignments. for example, you raise the car up so the tires spin freely. you mount the dial indicator on a fixed/stationary base. the dial indicator has a little piston that moves in and out and the readings on the dial indicate the movement of the piston. The indicator is adjusted so that the piston is resting on the surface of the wheel (either the face or the radial edge...depending on which alignment you are measuring) then zeroed. the wheel is then spun and readings are taken at points around the wheel ideally returning to zero at the starting point. depending on what readings youre taking, the numbers indicate how "out of round" or "out of plane" the wheel is.

ideally the readings should all be zero, but that's never the case.

i read the posts on that link..

warped rotors are not "radially" misaligned.

warped rotors would be describing the "flatness", or in this case non-"flatness" (out of plane).

Is this a photo of a dial indicator that would be used for automotive rotor measuring?

http://www.mini-lathe.com/Measuremen...indicators.htm
Only $15 bucks or so, more for an American made one?