Abstract: A rotary reciprocal tool for attachment to a remotely controlled support arm includes a casing attached to the arm and enclosing a fluid pressure motor. The casing also provides a chamber into which pressure fluid is supplied for activating the motor. The tool further includes a working surface in generally arcuate configuration provided with a plurality of working protuberances to engage the surface to be treated and within the working portion of the tool a vibration generator is disposed to impact both reciprocal and rotary movement to the working portion. A damper element is positioned between the casing and the rotating reciprocal tool actuator to reduce the transmission of vibration from the working portion of the tool to the casing.

Abstract: A device for detecting cracks in steel slabs leaving continuous casting, which comprises two crack detecting units placed on either side of the passage of a slab leaving continuous casting and two descaling and cooling units located upstream of the detection units. Each detection unit comprises a mobile frame and a head which slides vertically with respect to the frame and which bears one vertical sensor and three horizontal sensors. The sensors are induction coils placed in a container which is surrounded by a forwardly open metal casing. One application of the device is the automatic switching of defective slabs towards a reprocessing unit.