### CMM: Gear Measurement Setup

You can use the Measure Gear dialog box to measure and evaluate the gear as specified by the parameters in the Define Gear dialog box.

Measure Gear dialog box – CMM

You can use the Measure Gear dialog box as follows by selecting the appropriate check box(es):

To Do This | Select This Check Box
Generate | Measure | Evaluate
Generate a PC-DMIS program to measure a gear |  |  |
Measure/execute and evaluate an existing PC-DMIS program to measure a gear |  |  |
G enerate, measure/execute, and evaluate the PC-DMIS program to align a gear |  |  |

Generate: When you select this check box, PC-DMIS Gear will generate a new part program to measure the gear as specified by the parameters in the Define Gear dialog box.

Measure: When you select this check box, PC-DMIS Gear will execute the part program selected in the Part Program area to measure and evaluate gear.

Evaluate: When you select this check box, PC-DMIS will automatically evaluate the gear and create a report as soon as the measurement is completed. Evaluation can be selected only if the Measure check box is selected.

Part Program Area

Part Program: Type the name of the PC-DMIS program file, along with the full path. You can click the browse button and select the part program file. The name of the PC-DMIS program file will appear in the box.

Alignment Area

Align File: Type the path and filename of the alignment file to be recalled and used in the gear measurement program. By default, PC-DMIS Gear automatically selects the alignment you performed using the Align icon. You can click the browse button and select the alignment file. The name of the file will appear in the box. For more information on alignment files, see the help topics on saving and recalling external alignments in the main PC-DMIS documentation.

Probe Area

Probe File: Type the name of the probe file, along with the full path that you want to use for measuring the gear. You can click the browse button and select the probe file name. The probe filename will appear in the box.

Use Alternate Probe File for Profile and Lead: This check box is available when the Measure check box on the Profile tab or Helix/Lead tab (or both tabs) is selected. To specify the use of a different probe configuration for measuring the profile and lead than the probe configuration used for measuring the pitch and runout, select this check box. When you select this option, the Probe File box for the probe file for the profile and helix/lead becomes available.

Use Multiple Tips: To specify that PC-DMIS Gear should use multiple tips to measure your gear, select this check box. If you have an indexing probe and you want to use more than one probe tip, you should select this option.

“A” Angle: This check box is available when Use Multiple Tips box is selected. Type the “A” angle that will be used for the measurements. The “A” angle of the probe remains constant. If you use a star probe and you do not want any probe head rotation, type 0 (zero) in this box.

Use analog probe: If you are measuring gear using analog/scanning probe, select this check box. This will determine the type of scan to be used for measuring the profile and helix/lead. If you select this check box, the Scan Type option in the Execution Controls area becomes available.

Note: Incorrect use of this option may result in unexpected measurement behaviors. One example of this is that when you use an analog probe and do not enable this option, the result may be to use analog scanning even if that was not your intention.

Probe has wrist: Select this check box if your probe configuration is using a wrist. In PC-DMIS, a probe configuration with a wrist uses the tip naming format “T1AXBY”, where X and Y are the angles of the wrist (for example: T1A90B180). For a fixed-head probe configuration, PC-DMIS uses the tip naming format “TIPX”, where X is the TIP #.

Move Up to Clearance Plane Before Rotating Probe: To move the probe to the value specified for Clearance Height before rotating it, select this check box.

Execution Controls Area

In this area, specify the parameters that control the motion of the machine while executing the gear measurement program.

Prehit Distance: Type the distance from the theoretical point at which the motion speed changes from Move Speed to the slower Touch Speed. The distance is specified in current part units (inches or millimeters).

Retract Distance: Type the distance the probe retracts from the surface after taking a hit. The distance is specified in current part units (inches or millimeters).

Check Distance: Type the distance past the theoretical hit location that the machine will continue to search for the surface of the part until it determines the surface is not there.

Clearance Distance: Type the distance the probe will retract in the XY direction. The distance is given in current part units (inches or millimeters).

Clearance Height: Type the distance the probe will retract in the Z direction. The distance is given in current part units (inches or millimeters).

Touch Speed: Type the speed at which the CMM takes hits. The value you enter is the percentage of the machine’s defined top speed.

Move Speed: Type the point to point positioning speed of the CMM. The value you enter is the percentage of the machine’s defined top speed.

Fly On: The Fly mode provides a way to move the probe around the part in a smooth, non-stopping motion. To select fly, select this check box. This option depends on the capability of the controller to execute circular moves.

Fly Radius: Type the radial distance of the arc path along which the probe will travel between move points.

Scan Type: This option is used for analog probes (such as an LSPX1S probe). For an analog probe, you can scan the profile and helix/lead in either Touch Trigger mode or Analog Scan mode. Select the appropriate type in the Analog Scan list.

Click this button to define the scan settings in the Scan Setting dialog box. For more information, see "Defining Scan Settings".

| To start gear measurement, click this button. PC-DMIS Gear will generate the measurement program if the Generate check box is selected, measure/execute the program if the Measure check box is selected, and Evaluate the gear if the Evaluate check box is selected.

A message will appear and ask if you are ready to start measurement. To run the gear measurement program, click Yes. To cancel the measurement, click No.

Once the measurement process starts, PC-DMIS Gear will open the Execute dialog box. Follow the instructions in the Execute dialog box to proceed. For more information, see "The Execute Dialog Box".