The Calibrate CJoint option allows you to calibrate the third axis of the wrist. Once this information is calculated, PC-DMIS uses it, together with the AB calibration data, to predict the tip position at any A, B, and C angle combinations for a probe that needs to be installed on a CJoint device, such as a Perceptron probe.
Starting with PC-DMIS 2019 R2, PC-DMIS no longer supports the Perceptron laser sensor. While you may still be able to install PC-DMIS 2019 R2 and later, PC-DMIS displays an error if you attempt to run measurement routines that use the Perceptron scanner. For additional information, please contact Technical Support.
Type of Operation area showing the Calibrate CJoint option selected
To Calibrate using the CJoint Option
Ensure that you have already performed the preliminary steps discussed in the "CJoint Tip Calibration Information" topic of this chapter.
Select Insert | Hardware Definition | Probe to display the Probe Utilities dialog box.
Click the Measure button to open the Measure Probe dialog box.
From the Type of Operation area, select the Calibrate CJoint option. Selecting this item enables the Wrist Calibration area if the appropriate wrist entries from the Option section in the PC-DMIS Settings Editor are set to 1 (either DEAWrist or RENISHAWWrist).
Ensure that you have a star probe configuration connected, with a tip pointing in the X+ direction.
From the Available Tools list, select a sphere qualification tool.
Type the desired measurement values for the sphere qualification.
Set the number of hits, the probe pre-hit and retract distances, and various speeds.
Fill out the Wrist Calibration area. In order to calibrate the C joint, you need to measure at least three C angle positions. This gives you the ability to specify the angles for calibrating the A, B, and C axes. The Start, Increment, and Angle boxes for the C row are for calibrating the C joint.
C Angle Start defines the starting C angle used for the calibration of your wrist's C joint. The default value is -180.
C Angle End defines the ending C angle used for the calibration of your C joint. The default value is 180.
C Angle Increment defines the angle increment between the starting and ending C angles. Angles are calibrated for your C joint device for the starting, ending, and additional angles based on the increment value. For example, an increment angle of 10 degrees adds angles for calibration every 10 degrees between the starting and ending angle. The default value is 10.
Be sure that the wrist's A Angle Start and B Angle Start are set to 0 when you calibrate a C joint device.
When you are ready, click the Measure button to start the calibration process.