Minor MIC
Inspecting the minor diameter on rotors can be done easily with Gagemaker.
For measuring the minor diameter, you have two options based on the number of lobes/peaks:
- Even number of lobes (2, 4, etc.)
The “valley to valley” measurement can be achieved using an Minor MIC gage (MM-06). The contact balls ride in the valleys and measure the minor diameter directly.
- Odd number of lobes (3, 5, etc.)
Rotor Saddle Gage
The minor diameter cannot be measured directly. To obtain the minor diameter, first measure the major diameter with the appropriate T-MIC™ gage. Second, use a “rotor saddle” gage to obtain the lobe/peak height. Finally, double the lobe/peak height and subtract it from the major diameter. The remainder is your minor diameter. Or written as a formula: Minor Diameter = Major Diameter – (Lobe Height x 2).