Dial Bore Gage Contact Points leaving witness/burnish marks

Stijloor

Staff member
Super Moderator
#11
The key to that issue is whether you have tri-lobal or bi-lobal variation in your roundness.
Amen! :agree1:

Tri-lobal variations can not be measured with a two-point measuring instrument. Bi-lobal is possible.

Not understanding roundness and cylindricity variations introduced by a manufacturing process leads to gross misinterpretations of dimensional and form measurement results.

Stijloor.
 
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