### Modifying Geometry Parameters

Geometry Parameters are used to define the geometry for the gear that is to be measured. Most of these values can be found in the drawing for the gear. If some of parameters are not provided from the drawing or if their value does not yet correspond to the drawing, the corresponding value can be estimated in order to make the measurement possible.

Select the Measure | Modify Geometric Parameters menu option or the Probe Calibration toolbar icon to open the Geometry Parameters dialog box.

Edit the following values to define the gear geometry:

- Number of Teeth: Provide the number of teeth for your gear.

- Normal Module(MM)/Diametrical Pitch(INCH): The heading for this box changes between "Diametrical Pitch (Inch)” and “Norm Module (MM)” depending on whether you selected INCH or MM as your Units of Measurement. Normal Module or diametrical pitch should be defined as part of the gear specification.

- Mean Spiral Angle: Determines the mean angle of the teeth.

- Outer pitch cone distance: Provides the shortest distance from the original alignment to the pitch point along the pitch cone.

- Mounting Distance: Provides the distance from the original alignment to the mounting point.

- Convex on right side: When this option is selected the right side of the gear teeth as viewed from the center of the gear is convex. If the convex side is on the left (see the large gear in the image below), then this option should not be selected.

- Gear Type: Select either "Gear" or "Pinion" as depicted below.

- Orientation: Select External for gears where the teeth are on the outside of the gear, or Internal for gears where the teeth are on the inside of the gear.

- Units: Select from either INCH or MM to define the units for your gear.

- Tooth Width: Defines the width of the tooth.

- Diff. Angle: Defines the angle difference from one tooth to the next.

Pitch Cone

- Half pitch cone angle: Defines the half cone angle for the pitch cone.

- Z-coordinate for pitch cone apex: The z-coordinate of the pitch cone apex is used to define the location of the pitch cone.

Face Cone

- Half face cone angle: Defines the half cone angle for the face cone.

- Z-coordinate of face cone apex: The z-coordinate of the face cone apex is used to define the location of the pitch cone.

Root Cone

- Half root cone angle: Defines the half cone angle for the root cone.

- Z-coordinate of root cone apex: The z-coordinate of the root cone apex is used to define the location of the pitch cone.

Applies the changes that have been made in the dialog box.

Cancels any changes and closes the dialog box.