Patent ID: 6874241
Filing Date: 2005-04-05
Classification: G01B

Abstract:
1. Measuring means for determining measurement error factors of a measuring machine which measures toothing tolerances of gearwheels by inserting two gauging elements in different tooth gaps of a gearwheel and then taking measurements from the positions of the inserted elements, the measuring means comprising a reference master having two first helically extending grooves disposed on one of an external circumference and an internal circumference of the master and representing tooth gaps for respectively receiving the two gauging elements to permit simulated measurements applicable to one of an externally helically toothed and an internally helically toothed gearwheel with an even number of teeth, the first grooves extending in a first helix direction and being arranged on opposite sides of the circumference on the same diameter, and two second helically extending grooves disposed on the same circumference as the first grooves and representing tooth gaps for respectively receiving the two gauging elements to permit simulated measurements applicable to one of an externally helically toothed and an internally helically toothed gearwheel with an uneven number of teeth, the second grooves extending in a second helix direction opposite to the first helix direction and being arranged on opposite sides of the circumference respectively on two diameters including therebetween a predetermined angle equal to half the pitch of the teeth of the uneven number.