m a x i m u s

if i use a vernier caliper such as this one:

http://www.ebay.com/itm/Electronic-Digital-LCD-Steel-Vernier-Caliper-Gauge-Micrometer-Tool-150mm-15cm-6-/400616652836?pt=LH_DefaultDomain_0&hash=item5d469d0024
... to measure thickness, how does it clear the outer lip that forms on the rotor? is this the wrong type of caliper? i would think the measuring surfaces would need to be bowed out a bit so that it can clear the outer ridge lip and then come back to center to measure the rotor surface (which is thinner than the outer lip).

m a x i m u s

Nvm, I found what I need.

jcfay

Yeah, you can just use a spacer as well of uniform thickness to clear the outer edge

Quadcammer

micrometer is better for that task.

QWKSNKE

C-mics are normally used

m a x i m u s

Thanks guys. I found a micrometer online.

Merc63

Caliper works fine. Just add a couple quarters to each side of the rotor so the caliper clears the lip. Then measure the quarters used and subtract from the measurement of the rotor with quarters.