# Master Flank Measurement

The following describes the process of measuring the Master Flank:

1. After all the parameters for the Master Flank have been set, and you have clicked Measure, you have to execute 9 manual hits in a specific order. These hits serve as a start value for the calculation of the probing points of the master grid to be measured and define the corner points of the grid.

2. Beginning at the root of the tooth in the direction to the tooth head, take three points, inside, in the middle and on the outside on the tooth (9 points total). This determines the material direction. You must establish a clearance position before measuring the first point and all further measurements can be taken without a clearance position.

3. PC-DMIS Spiral Bevel Gear computes the probing points for the measurement of the master grid according to the number of lines and columns based on the previously taken manual hits.

4. The points on the corner determine the size of the master grid .For the Computation of the grid points the program performs a linear interpolation of the Z coordinates and the radius according to the column and line numbers. The columns of the grid are parallel to the tooth profile and the lines are parallel to the head of the tooth.

5. The measurement of the master flank then is executed in two automatic runs.

6. After the measurement, the program computes an average master from all measured master flanks. The computed grid points are stored in the element as NPT's in meandering columns in such a way that the first column lies inwards on the tooth flank (first point at the root) and the last column outwards.

Note: This procedure will be executed on either the Convex, Concave or Both Flanks according to the Flanks selection value in the Master Flanks tab. See "Defining Master Flank Data".