A method of cutting (e.g. micro-milling) brittle materials where a protective ductile layer is present on the brittle material during the cutting step. The method offers an improved edge quality of the machined profile relative to previous cutting (e.g. micro-milling) techniques. A machined product obtained by or obtainable by this method is disclosed.

The self-propelled construction machine according to the invention, in particular road-milling machine, recycler, stabiliser or surface miner, comprises a machine frame 2, which is supported by a chassis 1, which has wheels or tracks 1A, 1B. A milling drum 4 is arranged on the machine frame. The wheels or tracks 1A, 1B and the milling drum 4 are driven by a drive unit 8. Furthermore, the construction machine comprises a control unit 19 for controlling the drive unit 8 and a signal-receiving unit 18 for detecting at least one measurement variable M(t) which is characteristic of an operating state of the milling drum 4. The construction machine is characterised in that the rotational speed of the milling drum 4 is adapted, on the basis of at least one measurement variable M(t) which is characteristic of a critical operating state of the milling drum, to the operating conditions of the construction machine in such a way that the milling drum is operated in a non-critical operating state. The adaptive open-loop control of the milling drum rotational speed allows the construction machine to be operated at an optimum operating point with respect to the milling drum rotational speed.

In a self-propelled construction machine (1), in particular road milling machine, recycler, stabilizer or surface miner, comprising a machine frame (4), at least two travelling devices (2), at least one hydraulic drive system (50) for driving at least two travelling devices (2), at least one working device, in particular a milling drum (6), for working the ground pavement (3), it is provided for the following features to be achieved: a detection device (44, 60, 62) is provided which detects fluctuations in the longitudinal speed (v.sub.act) of the construction machine (1) during movement of the construction machine (1), wherein a control unit (38) controls the hydraulic drive system (50) as a function of the detected fluctuations in such a fashion that the drive speed (v.sub.drive) for driving the travelling devices (2) specified by means of the hydraulic drive system (50) is continuously adjusted so that the detected fluctuations are reduced or compensated for.

Embodiments of the invention are directed to cutting tool assemblies, material-removing machines that include cutting tool assemblies, and methods of use and operation thereof. In some embodiments, the cutting tool assemblies described herein may be used in material-removing machines that may remove target material. For example, the cutting tool assemblies may include one or more superhard working surfaces and/or one or more shields.

A cutting tool holding device includes a base and a holder. The base includes a base body and an inserted bore. The base body includes a central connecting surface and two positioning surfaces. A lateral edge of each of the positioning surfaces is connected to the central connecting surface, and the two lateral edges are defined as a first lateral edge pair. The holder includes a disposing head and a shaft. The disposing head includes a head body and a tool bore. The head body includes a disposing surface and two bearing surfaces. Two lateral edges of the two bearing surfaces are defined as a second lateral edge pair. Two extending lines of the two lateral edges of at least one of the first lateral edge pair and the second lateral edge pair are close to each other.

A milling attachment for a work machine includes a frame including first and second frame side walls and a frame top. The frame top includes a movable front cover portion. A first adjustable side plate has a first ground engaging portion for engaging the ground surface. A first actuator is operably associated with the first adjustable side plate for raising and lowering the first adjustable side plate relative to the first frame side wall. A first actuator extension connects the first actuator to the movable front cover portion, the first actuator extension being configured such that the movable front cover portion is moved relative to the frame when the first adjustable side plate is raised or lowered relative to the frame.

A tool, for removing a cutting bit from a rotor of a rotor assembly of a machine, includes one or more input interfaces and one or more lighting units. The one or more input interfaces are configured to be actuated to perform one or more functions associated with removing the cutting bit from the rotor. The one or more lighting units are configured to be activated upon the actuation of the one or more input interfaces to illuminate at least a portion of the rotor assembly when performing the one or more functions associated with removing the cutting bit from the rotor.

A tool, for removing a cutting bit from a rotor of a rotor assembly of a machine, includes one or more input interfaces and one or more lighting units. The one or more input interfaces are configured to be actuated to perform one or more functions associated with removing the cutting bit from the rotor. The one or more lighting units are configured to be activated upon the actuation of the one or more input interfaces to illuminate at least a portion of the rotor assembly when performing the one or more functions associated with removing the cutting bit from the rotor.

A device for extracting a cutting bit from within a securement hole in cutting equipment. The device has a base body having an open base end that contact the cutting equipment that surrounds the cutting bit. An elongated drive body having a threaded member with a threaded bore, rotatively contacts the base body, and a threaded post having a threaded portion is threaded within the threaded bore of the elongated drive body, and has a lower end extending into the base body. A pair of bit jaws are attached to the lower end of the threaded post, each having an in-turned ledge for engaging a peripheral groove of the cutting bit. By rotating the drive body, the threaded post is drawn axially upwardly, and with it the pair of bit jaws, to withdraw the cutting bit from the hole in the cutting equipment.

A retainer for a rotating bit and/or pick that includes a slot extending from a forward end of the retainer to a distal end of the retainer. The slot includes a gap profile formed by the configuration or design of a first radial end surface of the slot and a second radial end surface of the slot. The retainer includes a dual corner break formed by a first angled surface extending from the distal end of the retainer to the first radial end surface of the slot and a second angled surface extending from the distal end of the retainer to the second radial end surface of the slot. In additional embodiments, the retainer can include any of or any combination of a lead-in chamfer at the distal end of the retainer, a relief notch extending from the distal end of the retainer, and a compression slot extending from the relief notch. The retainer may be used independently with the rotating bit or it may be used in conjunction with nearly butted or solid generally cylindrical hollow spacers and/or washers.