Tool setting or analysis device and method therefor

摘要

A tool setting or tool analysis device for a machine tool comprises a light source 12 for producing a light beam 20. A light receiver 34 receives the light beam and produces a signal indicative of the amount of light received. A circuit which receives the signal from the light receiver and generates an initial trigger signal and further trigger signals after the initial trigger signal when the beam is at least partially occluded by a tool In this way, if the initial trigger signal is generated in a blind window of a control machine, the further repeated trigger signal will continue after the blind window to ensure the control machine reacts.