The helical tunneling device is a tool for tunneling along helical or spiral paths. Further, the tool may be used as a fixation device along helical/spiral paths, for connecting different surfaces or joints. Furthermore, the device includes associated instrumentation needed for creating such a helical path. In one embodiment, the device uses a woven flexible shaft in a helical tube to transmit rotational motion to a cutting tool. The helical tube may then be rotated independently to advance the cutting tool along a helical trajectory. In another embodiment, the device may advance helically into the created tunnel to engage, couple, and fix the relative positions of both bodies through which a continuous helical tunnel is created. Thus, the helical tunneling device is a simple and efficient tool that may be beneficial for wood working, orthopedics, metal manufacturing etc.

The helical tunneling device is a tool for tunneling along helical or spiral paths. Further, the tool may be used as a fixation device along helical/spiral paths, for connecting different surfaces or joints. Furthermore, the device includes associated instrumentation needed for creating such a helical path. In one embodiment, the device uses a woven flexible shaft in a helical tube to transmit rotational motion to a cutting tool. The helical tube may then be rotated independently to advance the cutting tool along a helical trajectory. In another embodiment, the device may advance helically into the created tunnel to engage, couple, and fix the relative positions of both bodies through which a continuous helical tunnel is created. Thus, the helical tunneling device is a simple and efficient tool that may be beneficial for wood working, orthopedics, metal manufacturing etc.

The radial run-out tool (2), particularly a drill or a cutter, has a basic body (12) extending in an axial direction (4) and comprises at least two chip grooves (14), to which a guide chamfer (22) is connected in the rotational direction (24), with a ridge (15) being formed between them. A radial clearance is connected to the guide chamfer (22). In order to enable simple and economical production of such type of radial run-out tool (2), an unprocessed rod (30) is ground non-concentrically, in a first process step, such that a radius (R) of the unprocessed rod (30) varies, depending on the angle, between a maximum radius (R2) and a minimum radius (R1). In a second process step, the chip grooves (14) are grounded down such that the guide chamfers (22) are formed at the positions with the maximum radius (R2) and the radius (R) is subsequently reduced downstream of the respective guide chamfer (22) in order to form the radial clearance (28).

A drilling apparatus and method for drilling holes into a composite workpiece. The drilling apparatus may include an end effector, a drill bit, and a control system. The end effector may include an end effector housing, a drill bit attachment, a rotation actuator, and a linear motion actuator. The linear motion actuator may convert rotary motion of a rotary motor into linear motion of the drill bit attachment. The drill bit may have a widest portion which cuts a hole into the workpiece and a narrow flute portion limiting contact time between the drill bit and the workpiece. The control system may control a speed of the linear motion actuator, with a first speed as the drill bit is plunged into the workpiece and a second speed, slower than the first speed, as the drill bit is retracted out of the workpiece.

A micro-reinforced concentric twist drill. Concentric drilling and micro-reinforcing technologies are applied to cutting faces of the twist drill, and upright micro-reinforced center drills are symmetrically arranged on spiral cutting surfaces on two sides of an axial central area, and extend to the rear cutting surface and form drill center hole cutters in a protruding manner; a micro-reinforced central cutting face is arranged on the inner side of each micro-reinforced center drill in a protruding manner, and the micro-reinforced central cutting face extends to the axial front and intersects with the rear cutting surface to form a micro-reinforced central drilling edge of the micro-reinforced concentric twist drill; and/or upright micro-reinforced reamers are symmetrically arranged on central areas of the spiral cutting surfaces on two sides of the axial center in an integral manner; a protruding reaming cutting face is formed on the inner side of each micro-reinforced reamer.

A drilling tool, in particular a rock drilling tool, for a portable machine tool, includes an axis of rotation, at least one spiral path, and at least one wear surface transition. The at least one spiral path is coiled about the axis of rotation along the axis of rotation and includes at least one wear surface having at least one bandwidth. There is a change in the at least one bandwidth of the at least one wear surface at a position of the at least one wear surface transition.

The invention involves the extraction process of a glow plug pencil (23) or a broken pencil (23) which is stuck in a cylinder head (13) housing (11) of a glow plug engine comprising a lower (19) and upper (17) part, so that the upper part (17) forms a shoulder (21) with the lower part (19), the pencil (23) being stuck in the lower part (19). The process is remarkable in that it includes a step (a) for drilling a bore in the pencil (23) according to the longitudinal direction of the latter which is performed with the use of a drill bit (1) comprising a drilling part (5) with flutes (7) and a shank (3) respectively having a diameter smaller and greater than the lower part diameter (19) of the housing (11) so that the shank (3) forms a shoulder (9) with the drilling part (5), and in that step a) for drilling the bore includes the drilling of the pencil (23) until the said shoulder (9) of the drill bit (1) is positioned to a stop against the shoulder (21) of the housing (11).

A drill includes a blade tip part that is formed of diamond and a trunk part that is formed of diamond and is continuous with the blade tip part, the drill rotating about a drill axis, the blade tip part includes N cutting edges where N is an integer of no less than 4, and a proportion of S1 to S2 is no less than 30% and no more than 60%, where S1 is an area of the drill in a cross-section with the drill axis as a normal line, the cross-section including a boundary between the blade tip part and the trunk part, r is a maximum value of a distance from the drill axis to an outer edge of the drill in the cross-section and S2 is an area of a circle with r as a radius.