### Pitch Tab

This tab lets you specify the required data for the Pitch
measurement of a bevel gear.

Gear Definition dialog box – Pitch tab for bevel gears

Measure: When this check box is selected, the pitch for the gear will be measured during the measurement process based on the parameters defined on the Pitch tab.

Pitch Point Definition Area

Pitch Point Definition: Define pitch point's location on each flank using Type A (Master Grid) or Type B (Radius and Z Coordinate). Use Type A to find the specified pitch point from grid points in master flank data by specifying row and column numbers. Use Type B by inputting radius and z coordinate to calculate the pitch point by piercing the circle into the surface defined by master flank data.

Type A: Master Grid Area

Pitch point in master grid convex: Type the row and col (column) numbers for the pitch point of the master grid on the convex side. All probing points and machine paths are generated automatically by the program. The pitch point is the hit point where the CV flank is measured.

Pitch point in master grid concave: Type the row and col (column) numbers for the pitch point of the master grid on the concave side. All probing points and machine paths are generated automatically by the program. The pitch point is the hit point where the CC flank is measured.

Type B: Radius and Z Coordinate

Radius of Pitch Point: Type the radius of the pitch point. Gear calculates pitch points on each flank by piercing the circle with the master flank surface.

Z Coordinate of Pitch Point: Type the Z coordinate of the pitch point. Gear calculates pitch points on each flank by piercing the circle with the master flank surface.

Evaluation Area

Plot Magnification: This value is used to define magnification scale for the created report in plot server. If you specify ‘0,' the evaluation is carried out, but no plot output will be created. However, the evaluation parameters are stored in the measurement result.

Tolerances (mm/inch) Area

This section allows you to define the following tolerances for evaluating pitch and runout. Review your gear standard for a definition of each parameter.

- Cumulative pitch deviation (Fp)

- Individual pitch deviation (fp)

- Adjacent pitch deviation (fu)

- Individual pitch variation (Rp)

- Radial runout (Fr)

Note: With the measured pitch points, a runout evaluation can also be executed.

Evaluate Tooth Thickness: When this check box is selected, Gear will evaluate chord tooth thickness and output the result in the report. The tooth thickness is evaluated with actual pitch points.

Cord Tooth Thickness Area

Nominal: Type the nominal value of chord tooth thickness.

Max: Type the maximum value of tooth thickness.

Min: Type the minimum value of tooth thickness.