Abstract: The present invention relates to a method for measuring the diameter and/or the geometry of the diameter of a cylindrical object. The cylindrical object has a longitudinal axis and a cylindrical shell. The method comprises measuring in a contactless manner at a specific point in the direction of the longitudinal axis the momentary circumferential velocity of the cylindrical shell at specific time or the distance which the circumference of the cylindrical shell rotates, measuring revolutions of the cylindrical shell or the angle of rotation of the cylindrical shell simultaneously with the measuring of the momentary circumferential velocity at specific time or the distance which the circumference of the cylindrical shell rotates, and calculating the diameter of the cylindrical shell and/or the geometry of the diameter of the cylindrical shell at the specific point in the direction of the longitudinal axis.

Abstract: The present invention relates to the field of mineral and metallurgical processes, to disintegrating in general and to disintegrating by tumbling mills, and more particularly to a method and arrangement for determining a degree of fullness of a large grinding mill drum, and to a large grinding mill drum. An arrangement for determining a degree of fullness of a grinding mill drum has a sensor arrangement attached to at least one lifting bar bolt of an at least one lifting bar of the grinding mill. The sensor arrangement includes at least one force transducer attached to the at least one lifting bar bolt. With the help of the measurement arrangement, more reliable measurement data can be provided for the determination of the degree of fullness of a grinding mill drum.

Abstract: The present invention relates to the field of mineral and metallurgical processes, to disintegrating in general and to disintegrating by tumbling mills, and more particularly to a method and arrangement for determining a degree of fullness of a large grinding mill drum, and to a large grinding mill drum. An arrangement for determining a degree of fullness of a grinding mill drum has a sensor arrangement attached to at least one lifting bar bolt of an at least one lifting bar of the grinding mill. The sensor arrangement includes at least one force transducer attached to the at least one lifting bar bolt. With the help of the measurement arrangement, more reliable measurement data can be provided for the determination of the degree of fullness of a grinding mill drum.