Touch Probe for Machine Tools Uses Pressure-Sensing

With this accuracy and repeatability, machined part verification is no longer a challenge.

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Employing a pressure sensor, Heidenhain’s TS 740 touch probe simultaneously maintains unusually high accuracy. The touch probe has an accuracy of < ±1 micron with a repeatability of 2s ¯ = 0.25 micron at a probing velocity of 0.25 m/min. With this accuracy and repeatability, machined part verification is no longer a challenge.

The trigger pulse on the touch probe is obtained through force analysis. The forces acting during probing are processed electronically. This method provides consistent probe accuracy of more than 360 degrees.

With the TS 740, the deflection of the stylus is then measured by several pressure sensors that 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. 

This touch probe is a good choice for demanding measuring tasks on machine tools. The signals are transmitted via infrared, which is also especially useful for use on machines with automatic tool changers.

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