Abstract: An apparatus, rock drilling rig and method for rock drilling includes a turning device for moving a drilling tool around longitudinal axis of the tool. The turning movement is controlled by an alternating turning system so that direction of turning movement is continuously reversed to first and second turning directions. The turning angle of the tool is restricted and a safety system (is configured to monitor the operation and to ensure that a predetermined turning angle is not exceeded.

Abstract: An apparatus, rock drilling rig and method for rock drilling includes a turning device for moving a drilling tool around longitudinal axis of the tool. The turning movement is controlled by an alternating turning system so that direction of turning movement is continuously reversed to first and second turning directions. The turning angle of the tool is restricted and a safety system (is configured to monitor the operation and to ensure that a predetermined turning angle is not exceeded.

Abstract: The present invention relates to a receiver and a recoil lug for a gun. The receiver and the recoil lug with which the receiver is arranged to be fastened to the stock of the gun, are manufactured as separate pieces in accordance with the invention. A characteristic of the invention is that the receiver is manufactured by cold-hammering, inner and outer surfaces thereof are finished. Another feature of the present invention is that the recoil lug is fastened to the receiver by driving the same to form a tight force fit between the two, with guiding surfaces for the gun barrel being formed onto the receiver and onto the recoil lug. The receiver is manufactured to be substantially symmetrical with respect to a longitudinal axis thereof, with an external, shouldered connecting surface being shaped onto the receiver. An annular inner surface is shaped onto the recoil lug which, together with the connecting surface of the receiver, forms the force fit.