A control method for a core drill and a feed device for driving the core drill along a machine holding device, including the method steps: moving the core drill in a first direction; detecting the surface position of a material based on reaching a threshold value for at least one feed device parameter as a first reference value; moving the core drill in a second direction; operating the core drill in a tapping mode; moving the core drill in the first direction; detecting the surface position of a material based on reaching a threshold value for at least one corresponding drilling parameter as a second reference value; activating a water supply; and activating a regulating and control unit for adapting at least one drilling parameter as a function of at least one parameter of the feed device. A feed device for driving a core drill along a machine holding device for the use of the method, a core drill for the use of the method, as well as a core drilling system including a core drill and a feed device for driving the core drill along a machine holding device for the use of the method.

A hand-held electrically powered cut-off tool (100) for cutting concrete and stone by a rotatable cutting disc (105), the cut-off tool (100) comprising an electric motor (130) arranged to be controlled by a control unit (110) via a motor control interface (120), wherein the control unit (110) is arranged to obtain data indicative of an angular velocity of the cutting disc (105), and to detect a kickback condition based on a decrease in angular velocity, and wherein the control unit (110) is arranged to electromagnetically brake the electric motor (130) in response to detecting a kickback condition.

A cutting machine according to the present invention comprises: a cutting frame; a cutting shaft which, if the direction in which the cutting machine moves is said to be the front and the direction opposite thereto is said to be the rear, is arranged on the front of the cutting frame, and a cutting blade inserted to the cutting shaft; a middle frame which is positioned below the cutting frame and supports same; a first track part provided on one side of the cutting machine in order to move same, and a second track part provided on the other side of the cutting machine; and a track frame positioned below the middle frame and the sides of which are connected to the respective track parts, wherein the front end of the middle frame is positioned to be lower than the rear end thereof so that the middle frame is slanted in a first preset angle, and the cutting frame is positioned above the middle frame, fixes the rear end, and can be provided so that the cutting shaft and the cutting blade can move vertically.

A cutting machine according to the present invention comprises: a cutting frame; a cutting shaft which, if the direction in which the cutting machine moves is said to be the front and the direction opposite thereto is said to be the rear, is arranged on the front of the cutting frame, and a cutting blade inserted to the cutting shaft; a middle frame which is positioned below the cutting frame and supports same; a first track part provided on one side of the cutting machine in order to move same, and a second track part provided on the other side of the cutting machine; and a track frame positioned below the middle frame and the sides of which are connected to the respective track parts, wherein the front end of the middle frame is positioned to be lower than the rear end thereof so that the middle frame is slanted in a first preset angle, and the cutting frame is positioned above the middle frame, fixes the rear end, and can be provided so that the cutting shaft and the cutting blade can move vertically.

Semiconductor wafers are produced from a workpiece by means of a wire saw, by feeding the workpiece through an arrangement of wires tensioned between wire guide rollers and divided into wire groups, the wires moving in a running direction producing kerfs as wires engage the workpiece. For each of the wire groups, a placement error of the kerfs of the wire groups determined, and for each of the wire groups compensating movements of the wires of the wire group are induced as a function of the placement error, in a direction perpendicular to the running direction of the wires during feeding of the workpiece through the arrangement of wires, by activating at least one drive element.

A grinding wheel used for grinding of a work piece is provided. The grinding wheel includes a circular disc-shaped base having a fixed end surface in contact with a mount of grinding apparatus and a free end surface on the opposite side to the fixed end surface, and plural abrasive stone chips arranged in a ring manner on the free end surface of the base. The abrasive stone chips are each formed into a block shape having a surface in which two or more kinds of plate-shaped abrasive stone members containing abrasive grains and a binder are exposed to the outside by overlapping the two or more kinds of abrasive stone members. The surfaces exposed to the outside in the abrasive stone chips serve as grinding processing surfaces that get contact with the work piece.

Systems and methods are described for finishing slabs. In an exemplary embodiment, a stone-cutting miter saw includes a support fixture that is configured to support a stone slab, a guide rail, and cutting and grinding heads movably supported on the guide rail.

This invention relates to a method for determining a wear state of a chisel, a chisel holder, and/or a chisel holder replacement system equipped with a chisel and chisel holder. For this method to give the user qualitative and quantitative information about the wear, according to one embodiment of this invention, a position of at least one point of the chisel and/or the chisel holder is determined by a contactless measurement method and a corresponding measurement result is compared in a switching unit to a reference value stored in a memory device.

This invention relates to a method for determining a wear state of a chisel, a chisel holder, and/or a chisel holder replacement system equipped with a chisel and chisel holder. For this method to give the user qualitative and quantitative information about the wear, according to one embodiment of this invention, a position of at least one point of the chisel and/or the chisel holder is determined by a contactless measurement method and a corresponding measurement result is compared in a switching unit to a reference value stored in a memory device.

An automatic machining device for machining a high-speed rail pantograph carbon contact strip is sequentially provided with a milling position, a sawing position and a chamfering position, and comprises a rack, a band sawing machine, a workpiece milling device, a workpiece chamfering device, a CNC computer numerical control system and a pneumatic system. A carbon contact strip workpiece to be machined is arranged on the rack and is sequentially subjected to milling, sawing and chamfering machining; and a saw frame of the band sawing machine is also provided with a saw band upper guide servo rotating device and a saw band lower guide servo rotating device, and the saw band upper guide servo rotating device and the saw band lower guide servo rotating device can freely, synchronously and correspondingly rotate a band saw blade within a certain range.