Process and pre-positioning

A calibration sphere is measured a total of three times to measure the rotary axis. Between each of these measurements, the angle of the measured axis must be changed and the calibration sphere re-approached.

Pre-positioning between calls is executed by the user.

Notice

During pre-positioning, only linear axes and rotary axes involved in a complete kinematic transformation may be moved. During the measurement, the measured rotary axis may not be involved in a kinematic transformation.

The orientation of the touch probe head in the current coordinate system may only be changed during pre-positioning by the axis to be measured.

Two cases are conceivable to use this cycle:

1. Measuring a stationary rotary axis: The position of the rotary axis in the current coordinate system is fixed or no upstream axis must be moved for pre-positioning (e.g. round table). In this case, the calibration sphere must be mounted so that the position of its centre point in the current coordinate system co-rotates with the rotation of the rotary axis. The position of the touch probe head can be moved for pre-positioning by linear axes or by rotary axes involved in a kinematic transformation.

2. 

2. Measuring a moved rotary axis: The position of the rotary axis is changed by upstream linear axes (e.g. 5-axis machine with swivel head). In this case, the calibration sphere must be mounted stationary in the current coordinate system. The touch probe head co-rotates with the measured rotary axis. The measured rotary axis may not be involved in any kinematic transformation so that a distinction can be made between the measured centre points of the calibration sphere.