Patent ID: 6931749

Claim:
An apparatus for checking the diameter of pins, rotating about a geometrical axis, in the course of the machining in a numerical control grinding machine including a worktable, defining said geometrical axis, and a grinding wheel slide carrying a grinding wheel, the apparatus comprising: a measuring head including a Vee-shaped reference device for cooperating with the pins to be checked, said Vee-shaped reference device having an opening angle, a feeler for contacting surfaces of the pins to be checked and performing translation displacements substantially along the bisecting line of the Vee-shaped reference device, and a transducer for generating signals depending on the position of the feeler with respect to the Vee-shaped reference device, said opening angle of the Vee-shaped reference device being a factor in defining a measurement range for said measurement head, a support device, adapted to be coupled to the grinding wheel slide, including reciprocally movable coupling elements, for supporting the measuring head in a movable way, a control device for controlling automatic displacements of the measuring head from a rest position to a checking condition and vice versa, and a processing and display device connected to the measuring head for receiving and processing the signals provided by the transducer, wherein the processing and display device includes a memory unit for storing compensation values or coefficients relevant to linearity errors of the transducer, said compensation values or coefficients being also a factor in defining said measurement range for said measuring head, the processing and display device being adapted to process the transducer signals and corresponding compensation values or coefficients and provide measuring signals.