Abstract: A measuring and control method to check the position and/or wear of a knife element supporting a piece being machined in centerless grinders including foreseeing the generation of signals responsive to the position of the workpiece surface close to the supporting knife element and comparing the signals with reference signals depending on the workpiece size and the optimum position of the supporting knife element. The result of the comparison is responsive to the real position and/or wear of the supporting knife element. A device for the method which comprises a gauge for measuring linear dimensions having at least one moving element adapted to cooperate with the surface of the piece being machined. The moving element is associated to position transducer means connected with threshold circuits to control alarm and control circuits, the control and alarm circuits being responsive to the wear and/or position of the supporting knife element.

Abstract: A method for checking the rotation of mechanical workpieces which includes the steps of measuring the workpiece size, processing the measuring signals occurring to generate at least one signal responsive to the measurement of size variations of the workpiece and utilizing the signal for generating control signals to indicate the evenness of the rotation of the piece. An apparatus for practicing the method includes feelers adapted to be brought to the measuring position on the workpiece to supply signals responsive to the size, a processing unit adapted to process the measuring signals detected at succeeding moments to supply information on the geometrical features of the workpiece or its variations, delay and timing units to trigger the processing unit connected with the output of the processing unit and adapted to compare the signals at the output itself with preset reference signals and a consent unit connected with the comparison unit operable as a result of the evenness of the workpiece rotation.