### Master Flank Measurement

The following example shows the locations of the tip, heel, root, and toe.

A - Tip
B - Heel
C - Root
D - Toe

A - Tip
B - Heel
C - Root

D - Toe
E - Concave face
F - Convex face (hidden from view)

When you click the Measure button, PC-DMIS Gear will ask you to probe nine points in a specific order for each flank. These points serve as a start value for the calculation of the DCC probing points of the master grid to be measured and define the corner points of the grid.

Note: PC-DMIS Gear will execute this procedure on either the convex flank, concave flank, or both flanks according to the Flank selection value in the Measure master flank data dialog box. See "Defining Master Flank Data".

To measure the nine manual hit points:

1. Beginning near the root area of the flank:

1. Measure a line of three hits from the root to the tip at the heel, or the outside diameter of the gear. Refer to 1, 2, and 3 in the diagram below.

Note: For each line, take points from root to tip. Take the line from heel to toe.

Note: You must establish a clearance position before measuring the first point. All further measurements can be taken without a clearance position.

2. Continue by measuring a second line of hits from the root to the tip in the middle of the gear. Refer to 4, 5, and 6 in the diagram.

3. Measure the last line of hits from the root to the tip along the toe, or the inside diameter of the gear. Refer to 7, 8, and 9 in the diagram. This determines the material direction.

Note: If you chose to generate master flank data on both flanks of the gear tooth, then PC-DMIS will ask you to probe another nine points on the other flank.

2. After you have taken the nine manual hit points:

- PC-DMIS 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.

- 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 tip of the tooth.

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

- 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 lies outwards.