A quick-release arbor is adapted for a cylindrical hole saw that has a bottom wall having a threaded central aperture and opposing indexing holes. The arbor has a central hexagonal passage with opposing key slots passing therethrough and a threaded hole saw fitting axially aligned with the hexagonal passage. The arbor has a hexagonal pilot shaft securely holding a pilot drill bit and intermediate opposing keys forming a position lock. The pilot shaft is adapted to freely pass through the passage. Within the arbor is a button chamber that is transverse to the hexagonal passage with a rear wall. A biased button is located within the button chamber having upper and lower cuts outs to permit the pilot shaft to freely pass through the cut outs of the button when the button is depressed and having rear pocket to capture one of the pilot shaft opposing keys when the button is released.

A cutting insert for a drilling tool is disclosed includes an insert body having a longitudinal direction. A first axial side extends across the longitudinal direction on opposite sides of the insert body. The insert body has a first cutting edge extending along a rim portion at an intersection between a first rake face and the first axial side. The first axial side includes a first relief face and a second relief face. The first and second relief faces form obtuse angles with an imaginary centre plane of the insert body.

A system is disclosed for releasable coupling of a hole saw to a drill arbor. The system includes an elongate drill arbor configured at a first end to be clamped in a drill chuck of a drill, and a hole saw adapter provided with a longitudinal bore in which the drill arbor can be received so that an inner surface of the longitudinal bore of the hole saw adapter is mounted slidably on an outer surface of the drill arbor in the longitudinal direction of the drill arbor. The drill arbor includes an actuator member and at least one retaining element co-acting therewith. The inner surface of the longitudinal bore of the hole saw adapter is provided with a recess into which the retaining element of the drill arbor can protrude.

A combination system of fixed arbor hole saws and quick-change mandrel that enables a user to drill multiple of same sized or different sized holes in desired substrate in a quick and hassle-free manner. A drill bit held and retained in the quick-change mandrel serves as a common pilot for all different fixed arbor hole saws. The combo system requires a single common quick lock mandrel that positively locks a hole saw on insertion. The securely locked hole saw can be released with easy pull on a collar in the mandrel. Also, the cut-out slug of any substrate is very easy to remove once the hole saw is released from the mandrel.

A drilling machine (120) for a core drill (100), the drilling machine comprises a motor arranged to power a spindle, the spindle comprising a drill bit interface (121 ) arranged to hold a drill bit (110) and to rotate the drill bit (110) about an axle of rotation (101 ), the drilling machine (120) comprising a tag reader (125) connected to a reader coil, wherein the reader coil is arranged at the drill bit interface (121 ) and surrounding the spindle to inductively couple to a tag coil arranged on the drill bit, the drilling machine (120) further comprising a drilling machine control unit (140) connected to the tag reader (125), wherein the drilling machine control unit is arranged to read data associated with the drill bit (110) via the inductively coupled reader and tag coils, thereby obtaining information about the drill bit.

A drilling machine (120) for a core drill (100), the drilling machine comprises a motor arranged to power a spindle, the spindle comprising a drill bit interface (121 ) arranged to hold a drill bit (110) and to rotate the drill bit (110) about an axle of rotation (101 ), the drilling machine (120) comprising a tag reader (125) connected to a reader coil, wherein the reader coil is arranged at the drill bit interface (121 ) and surrounding the spindle to inductively couple to a tag coil arranged on the drill bit, the drilling machine (120) further comprising a drilling machine control unit (140) connected to the tag reader (125), wherein the drilling machine control unit is arranged to read data associated with the drill bit (110) via the inductively coupled reader and tag coils, thereby obtaining information about the drill bit.

A four-hole core drilling machine of the invention includes a vertically reciprocating carriage mounted to a body, a motor coupled to the carriage, a fixing plate coupled to the carriage, to rotatably support a drive shaft of the motor, a pivoting plate fastened to the fixing plate under the condition that a pivot angle of the pivoting plate is changed, a drive pulley coupled to the drive shaft, to be rotatable by the drive shaft, four driven pulleys rotatably mounted to the pivoting plate near corners of the pivoting plate, four driven shafts rotatably mounted to the pivoting plate and coupled to the four driven pulleys, to be rotatable by the driven pulleys, a belt mounted around the drive pulley and the driven pulleys, to transmit rotation force of the drive pulley to the driven pulleys, and four core bits coupled to lower ends of the driven shafts.

A wood-drill adapter system having a wood-drill adapter assembly. The wood-drill adapter assembly includes a core-bit-blank, an adapter-insert, and a set-screw. The core-bit-blank includes a hollow-tubular body, with the hollow-tubular-body including a hole; and the cap includes a cap-plate, and a threaded-coupler. The wood-drill adapter assembly is useful for allowing a user to use a coring-rotary-tool typically used for concrete drilling/coring to drill a circular-opening in a wooden-material using the wood-boring tool. The adapter-insert includes an upper-disc, a tubular-body, a lower-disc, and a set-screw-receiver. The upper-disc includes an upper-face, a lower-face, an outer-circumference, and an upper-aperture. The lower-disc includes an upper-surface, a lower-surface, an external-circumference, and an internal-circumference. The tubular-body includes an outside-circumference, an inside-circumference, an upper-rim, and a lower-rim.

A wood-drill adapter system having a wood-drill adapter assembly. The wood-drill adapter assembly includes a core-bit-blank, an adapter-insert, and a set-screw. The core-bit-blank includes a hollow-tubular body, with the hollow-tubular-body including a hole; and the cap includes a cap-plate, and a threaded-coupler. The wood-drill adapter assembly is useful for allowing a user to use a coring-rotary-tool typically used for concrete drilling/coring to drill a circular-opening in a wooden-material using the wood-boring tool. The adapter-insert includes an upper-disc, a tubular-body, a lower-disc, and a set-screw-receiver. The upper-disc includes an upper-face, a lower-face, an outer-circumference, and an upper-aperture. The lower-disc includes an upper-surface, a lower-surface, an external-circumference, and an internal-circumference. The tubular-body includes an outside-circumference, an inside-circumference, an upper-rim, and a lower-rim.

A boring device includes: a rotatable body, which has a workpiece holder, a valve seat receiver and a debris passage portion; a laser emitter; a pump and a control unit. The workpiece holder can hold a nozzle body. The valve seat receiver contacts a valve seat of the nozzle body that is held by the workpiece holder. The laser emitter emits a laser beam to an outer wall of the nozzle body to bore injection holes at the nozzle body. The debris passage portion includes a debris passage that is placed on a radially inner side of the valve seat receiver and guides debris formed at the time of boring the injection holes with the laser beam. The pump vacuums the debris through the debris passage. The control unit controls a laser output power of the laser emitter and a suction force of the pump.