Patent ID: 7312433
Filing Date: 2007-12-25
Classification: B23Q,G01V,Y10T

Abstract:
1. A cutting tool measuring device for use on a machine tool, the device comprising: an emitter having a radiation emitter for emitting a beam of radiation; a detector having a radiation detector for detecting said beam of radiation; and a tool measuring apparatus for generating a trigger signal when said beam of radiation is at least one of broken and restored by a cutting tool; wherein at least one of the emitter and the detector comprise a radiation restrictor which restricts the amount of radiation reaching the radiation detector, the radiation restrictor including an adjustment for selecting the amount of radiation reaching the radiation detector, wherein the radiation restrictor has a plurality of caps, each cap being fittable to at least one of the emitter and the detector, wherein each cap, when fitted to said at least one of the emitter and the detector, allows a different amount of radiation to pass to the radiation detector, and wherein said beam of radiation has a substantially circular cross-section after being acted upon by said radiation restrictor.