CONCENTRICITY

Concentricity is the relationship of two or more circles or circular surfaces having a common center. It is designated at TIR (total indicator reading) and is the total movement of the hand of an indicator set to record the amount that a surface varies from being concentric.

All diameters formed in the same mold plate will be concentric within 0.25mm TIR (.010 in TIR).

Example:
In Fig 2 diameter "A" will be concentric with diameter "B" within 0.25mm TIR (.010 in TIR).

Other diameters will be concentric within 0.75mm TIR (.030 in TIR).

Example:
In Fig 2 diameter "A" or "B" will be concentric with diameter "C" within 0.75mm TIR (.030 in TIR).


Example: Fig #3 Outside surface will be concentric with shaft within 0.75mm TIR (.030 in TIR) plus metal tolerance if unground. Note: Parts may be ground to closer tolerances.


Example:
Fig #4 Outside surface will be concentric with shaft within 2mm TIR (.085 in TIR) plus metal tolerance if unground.
Note: Parts may also be ground to closer tolerance.


Example:
On products similar to that described in Fig 5 having an outside diameter of 75mm (3in) concentricity within 0.75mm TIR (.030 in TIR) and wobble within 0.75mm TIR (.030in TIR) can be expected.