### Tip/Root Circle Tab

Use the Tip/Root Circle tab to specify the required data for the measurement and evaluation of the tip/root circle. Tip/root circle measurement is optional; if you do not want to measure the tip/root circle, clear the Measure option.

Define Gear dialog box – Tip/Root Circle tab for cylinder gear

Measure: When you select this check box, the tip/root will be measured during the measurement process based on the parameters defined on the Tip/Root Circle tab.

Click this button to set the values for Z coordinate of Measurement and Diameter of Tip Circle in the Tip Circle Measurement area based on the gear parameters. It will also set the values for Z coordinate of Measurement and Diameter of Root Circle in the Root Circle Measurement area based on the gear parameters.

Tip Circle Measurement Area

The "tip circle" is the circle measured by taking points on the tips of teeth. For an external gear, it is a major diameter. For an internal gear, it is a minor diameter.

Teeth List to be measured: The box to the right of the list specifies the tooth numbers for which the tip circle will be measured based on the Number of teeth value on the Parameters tab. The list defines for how many teeth the tip circle will be measured. By default, the tip circle will be measured on four teeth. The following options are available in the list:

- All: Measures all of the teeth. When you select this option, the teeth range automatically appears in the box, and you cannot change the value.

- Custom: Measures only the teeth that you type in the box. Separate the teeth with commas. For example: 1,8,14,20. An out-of-range error symbol will flash to the right of the box if the value that you enter in the box is out of range based on the Number of teeth value on the Parameters tab.

- 1, 2, 4, and 8: Enables PC-DMIS Gear to automatically calculate the teeth to measure. The teeth automatically appear in the box, and you cannot change the value.

Z Coordinate of Measurement: This value is the Z coordinate value where the tip points should be measured. This value is usually negative.

Diameter of Tip Circle: This value is the theoretical diameter of the tip circle.

Upper Tolerance: This value is the upper tolerance for the diameter of the measured tip circle.

Lower Tolerance: This value is the lower tolerance for the diameter of the measured tip circle.

Important: It should be noted that the tip circle and root circle are virtually reversed for internal gears. The tip circle will be the smaller diameter and the root circle will be the larger diameter.

Root Circle Measurement Area

The "root circle" is the circle measured by taking points on the root space between two adjacent gear teeth.

Teeth List to be measured: The box to the right of the list specifies the tooth numbers for which the root circle will be measured. The box defines for how many teeth the root circle will be measured. By default, the root circle will be measured on four teeth. The following options are available in the list:

- All: Lets you measure all of the teeth. When you select this option, the teeth range automatically appears in the box, and you cannot change the value.

- Custom: Lets you measure only the teeth that you type in the box. Type 16 or fewer teeth in the box, and separate them with commas. For example: 1,8,14,20

- 1, 2, 4, and 8: Enables PC-DMIS Gear to automatically calculate the teeth to measure. The teeth automatically appear in the box, and you cannot change the value.

An out-of-range error symbol will flash to the right of the box if you do one of the following:

- Select the Custom option in the list, type only one or two teeth in the box, and then click the Apply button. To resolve this error, type three or more teeth in the box.

- Change the Number of teeth value on the Parameters tab, but do not update the value in the box if it is out of range as a result of the change. To resolve this error, update the value in the box.

Z coordinate of Measurement: This value is the Z coordinate value where the root points should be measured. This value is usually negative.

Diameter of Root Circle: This value is the theoretical diameter of the root circle.

Upper Tolerance: This value is the upper tolerance for the diameter of the measured root circle.

Lower Tolerance: This value is the lower tolerance for the diameter of the measured root circle.