In Reply to Parent Post by Mike S.
Can someone please explain in simple terms (for someone who is a mental midget when it comes to geometrical issues) how to correctly measure concentricity? Hopefully using simple tools...
Say I have a part that is 1.000" OD x .500" ID x .400" thick. The .500" hole is supposed to be in the center. Say the concentricity spec. is .020".
How do I measure concentricity on this part?
There are several ways to measure concentricity. To suggest a few in the order of precision:
a. Caliper approach (James example)- For wider tolerance.
b. Ball anvil micrometers measured as wall thickness.
c. V-Block, height gauge, level type dial gauge
d. Expansion mandrel in the ID held between centres, height gauge, and level type dial gauge.
f. TALYROUND- roundness, concentricity checker
Additional two useful inputs would be
a.How precise you need your measurement?
b.How many of those you need to measure?
These inputs are for the economics side.
This what will help us decide which method and that will strike a balance between precision, speed, and equipment. This is your “appraisal cost”.
If the concentricity spec is as wide as mentioned in your example, James suggestion is probably the most economical way in terms of speed, precision and equipment choice.