Abstract: A strain of a rotor (2) loaded with centrifugal force is measured, whereby the rotor (2) is introduced into a receiving part of a spin test rig (1) that can be connected to a drive, a camera (4) and a short-term illumination unit (6) are triggered, and at least one region of a surface of the rotor (2) is photographed. This first image is transmitted to an evaluation unit (8) as a starting state. The rotor (2) is accelerated and, at at least one rotational speed, the camera and the short-term illumination unit (6) are triggered again and at least one further image of the previously photographed region of the surface is photographed, which is transmitted to the evaluation unit (8) as a measuring state. The evaluation unit (8) calculates a strain of the rotor (2) in the photographed region of the surface using a digital image correlation, wherein the exposure time of the image sensor of the camera (4) is determined from the duration of the illumination coming from the short-term illumination unit (6).

Abstract: Disclosed is a clamping device (1) for clamping a toolholder of a drilling, milling or grinding tool in a balancing machine, comprising a receiver unit (2) having a receiving opening (9) for the coupling shaft of the toolholder and a collet (10), in which the shaft (20) of an actuator (18) for actuation of the collet (10) is slidably guided in a centrally located bore (19) of the receiver unit (2). The shaft (20) has at its one end a load-applying body (22) upon which a plurality of compression springs (30, 31) take support to enable the collet (10) to be tightened. The compression springs (30, 31) are arranged and/or configured in such a way that the spring loads acting on the load-applying body (22) with the collet (10) tightened act on the load-applying body (22) asymmetrically relative to the axis of the shaft (20).

Abstract: Disclosed is a clamping device of a balancing machine for coaxially clamping a toolholder on a spindle rotary about an axis of rotation (3), in which the coupling shank (8) is supported in the receiving socket only on discrete supports (11-15) which are spaced from each other circumferentially and lie in three relatively spaced engagement planes (E1, E2, E3) intersecting the axis of rotation (3). Four rigid discrete supports (11-14) are arranged in pairs in the first (E1) and the second (E2) engagement plane and combine to form a rigid support in a first radial direction. Formed in the third engagement plane (E3) lying between the first and the second engagement plane is a fifth discrete support (15) which effects a supporting function in a second radial direction opposite the first radial direction.

Abstract: Disclosed is a clamping device (1) for clamping a toolholder of a drilling, milling or grinding tool in a balancing machine, comprising a receiver unit (2) having a receiving opening (9) for the coupling shaft of the toolholder and a collet (10), in which the shaft (20) of an actuator (18) for actuation of the collet (10) is slidably guided in a centrally located bore (19) of the receiver unit (2). The shaft (20) has at its one end a load-applying body (22) upon which a plurality of compression springs (30, 31) take support to enable the collet (10) to be tightened. The compression springs (30, 31) are arranged and/or configured in such a way that the spring loads acting on the load-applying body (22) with the collet (10) tightened act on the load-applying body (22) asymmetrically relative to the axis of the shaft (20).

Abstract: Disclosed is a clamping device of a balancing machine for coaxially clamping a toolholder on a spindle rotary about an axis of rotation (3), in which the coupling shank (8) is supported in the receiving socket only on discrete supports (11-15) which are spaced from each other circumferentially and lie in three relatively spaced engagement planes (E1, E2, E3) intersecting the axis of rotation (3). Four rigid discrete supports (11-14) are arranged in pairs in the first (E1) and the second (E2) engagement plane and combine to form a rigid support in a first radial direction. Formed in the third engagement plane (E3) lying between the first and the second engagement plane is a fifth discrete support (15) which effects a supporting function in a second radial direction opposite the first radial direction.