A drill bit includes a drill bit head, a multi-strand helix made up of three or more helix ribs, and a shank end along a drill bit axis. The multi-strand helix is made up of a conveyance area, a helix gradient, and a pitch. The helix ribs extend parallel to the drill bit axis in a first area adjacent to the drill bit head and a second area adjacent to the shank end.

A drill bit for chiseling stone includes an impact face at an insertion end of the drill bit, a hollow shank, where a delivery passage is defined within the hollow shank, and a drill head, where the drill head has, at a front end of the drill head, a cutting edge, an intake opening, and an intake passage. The intake passage connects the intake opening to the delivery passage. A cross section of the intake passage increases from the intake opening to the delivery passage.

A suction-extraction adapter for a drilling tool has a housing and a tool connection unit. The housing has a suction-extraction device interface for the detachable connection of a suction-extraction device to the suction-extraction adapter. The tool connection unit enables the axial fixing of the suction-extraction adapter on the drilling tool. The housing also has a locking mechanism. The tool connection unit is configured to be locked on the housing of the suction-extraction adapter via the locking mechanism.

A method for creating a weep hole is disclosed. The weep hole is drilled in an uncured, concrete, hollow core structural component having one or more external surfaces and one or more internal surfaces. The weep hole is drilled using a drilling apparatus comprising a drill, a rotating drill bit with an internal fluid passageway, a power source, and a pressurized fluid source. Loose, uncured concrete material deposited near the weep hole on the one or more internal surface as a result of drilling the weep hole is removed by releasing pressurized fluid which flows from the pressurized fluid source, through the drill and the rotating drill bit.

A method for manufacturing a continuous drill ring for a core drill bit is disclosed. The method includes forming at least two green compacts in layers in a direction of formation between a bottom side and a top side by successively applying powder layers containing a powder mixture and diamond layers containing diamond particles that are arranged in a set pattern, shaping the green compacts into ring segments under the effect of pressure, sintering the ring segments under the effect of heat, and combining the sintered ring segments in a circular manner and joining the same in a frictionally engaging or integrally bonding manner at the lateral edges thereof so as to obtain the continuous drill.

A method for manufacturing a continuous drill ring for a core drill bit is disclosed. The method includes forming at least two green compacts in layers in a direction of formation between a bottom side and a top side by successively applying powder layers containing a powder mixture and diamond layers containing diamond particles that are arranged in a set pattern. The green compacts are shaped into ring segments under the effect of pressure. The ring segments are joined in a circular manner and they are sintered under the effect of heat so as to obtain a continuous drill ring.

There is provided a drill bit for cutting tiles comprising a hollow body portion bearing an annular cutting surface at one end and a wax plug located within the hollow body portion, wherein an internal wall of the hollow body portion has at least one region of reduced thickness so as to provide one or more channels along which melted wax can flow to reach cutting surface. The channels can be provided by an offset central passage within body portion, or as elongate grooves around the internal wall of the hollow body portion. The channels can be helical grooves.

A method for producing a twist drill has the following steps. A blank is shaped to form a semi-finished product. The semi-finished product is formed from a core, coaxial with the drill axis, having a radius and a number of webs, arranged on the core, having a height. The semi-finished product has a constant cross section along the drill axis. The webs have a first portion which adjoins the core and in which a width of the web remains constant or decreases in the circumferential direction with increasing radial distance from the drill axis. The webs have a second portion which adjoins the first portion and in which the width of the web increases in the circumferential direction with increasing radial distance from the drill axis. The webs of the semi-finished product are shaped into helical segments using a plurality of rolling tools that annularly enclose the semi-finished product and roll on the webs along the drill axis. The rolling tools have teeth that are inclined with respect to the drill axis. A height of the helical segments is less than the height the webs. Helical segments formed from adjacent webs are in contact with one another in a closing fold. The invention also relates to a twist drill.

A machining segment for a machining tool which is rotatable in a direction of rotation about an axis of rotation includes an underside where the machining segment is connectable to a basic body of the machining tool by the underside. The machining segment has a machining zone of a matrix material and a plurality of first hard material particles that are disposed in the matrix material in accordance with a defined particle pattern. An upper side of the machining segment, opposite from the underside, is divided into a plurality of machining regions, which include respective ones of the plurality of first hard material particles, and a plurality of matrix regions which are built up from the matrix material. At least one of the plurality of machining regions has with respect to an adjacent matrix region a projection that is greater than 400 μm.

Provided is a core drill having one touch lock function of a core bit, and particularly, new-conceptional technology of maintaining locking automatically during assembling a core bit and a decelerating unit, and releasing the locking easily, and the core drill conventionally disclosed had problems that movement and separation of the core bit and the decelerating unit of the core drill often occur during operation, because there is no specific lock function in the state that the core bit and the decelerating unit are assembled, and in this disclosure of the present invention to solve the problems, there is provided new technology for automatically maintaining locking if releasing the locking after inserting a decelerating connector coupled to a core bit into a connection hole formed in a spindle in the state of releasing the locking by pressing the lock pin elastically installed in a lock housing fittingly installed outside the spindle.