Step A: Now we need to measure Htot (see Diagram 1 below). This is done by putting one of the flat sides of the caliper so that the two edges of the induction port are against that flat side and the other side is on the opposite side of the shaft. Write down this number, this is Htot.
The induction port is the square shaped hole along the length of the shaft. Picture below.
You do not have to measure H1, you calculate it from the other measurements.
Step C: Next we need to calculate the H1. This is also done by doing very simple arithmetic.
H1 is simply Htot (the measurement from Step A) minus R (calculated in Step B).