Touch probe for machine tools uses pressure sensing

Heidenhain offers the TS 740 touch probe with pressure sensor. The unit has an accuracy of < +/-1 µm at a probing velocity of 0.25 m/min.

The trigger pulse is obtained through force analysis. The forces acting during probing are processed electronically. This method provides consistent probe accuracy over 360 degrees, says the company.

Several pressure sensors are arranged between the contact plate and the probe housing. When probing a workpiece, the stylus is deflected so that a force acts on the sensors. The signals generated are processed, and the trigger signal is produced. The relatively low probing forces provide high probe accuracy and repeatability, while offering precise trigger characteristics in all directions, the manufacturer states.