Abstract: A head of a cutting device includes a base configured to be fixed to a machine tool, a cylindrical suction nozzle integral with the base, a connector integral with the base and configured to receive a suction pipe. The suction nozzle is perforated by at least one oblong hole, for example parallel to an axis of the suction nozzle.

Abstract: A workpiece support device includes: a jig, a table, a rotating shaft, a support member, a flow path connector, and a supply-side connecting portion. The jig has a main flow path to flow a fluid for machining and a sub-flow path, and fixes the workpiece. The table has a table flow path to communicate with the main flow path and is attached with the jig. The rotating shaft has a rotating shaft flow path to communicate with the table flow path, and is fixed to the table. The support member rotatably supports the rotating shaft. The flow path connector connects the rotating shaft flow path with a fluid-supply path to communicate with a fluid-supply side so as to relatively rotate with each other about an axis of the rotating shaft. The supply-side connecting portion moves relative to the jig to communicate with and block off the sub-flow path.

Abstract: The invention relates to a dental milling machine which has a closed milling chamber (12). Said milling chamber has an air inlet opening and an outlet which are substantially opposite each other relative to the milling chamber and generate an air stream. Said air stream sweeps over a machining area in which a milling tool subjects the workpiece to a milling machining step. One end of the milling chamber (12), in particular the front end, has a door that can be opened. The base (42) of the milling space (12) runs at least partially at an angle and in particular is rounded off and the outlet (40) is connected to the lowest region of the base (42).

Abstract: A waste system is disclosed. In some embodiments, the waste system includes a vacuum cell, a flexible waste container, and a vacuum source. The flexible waste container may have at least one flexible membrane at an interface between the flexible waste container and the vacuum cell. The vacuum source may be configured to suction air out of the vacuum cell to generate a negative pressure in the vacuum cell. The vacuum source discharge is generally odorless as it is separated from the waste. This odorless discharge can enter occupied aircraft compartments. The negative pressure in the vacuum cell acts on the flexible waste container to generate a (second) negative pressure in the flexible waste container. The negative pressure in the flexible waste container acts on an interface between a toilet and the flexible waste container to pull waste from the toilet into the flexible waste container.

Abstract: A debris control apparatus comprising a debris control enclosure, the enclosure further comprising a vacuum opening in the enclosure. The vacuum opening being sized, shaped and positioned to receiving a vacuum conduit, connected to a vacuum source, for extracting the debris from the enclosure. The debris control apparatus further comprising a mounting assembly for mounting the enclosure to a machine, such that, during operation, the enclosure moves along the work material as the cutting tool moves along the work material, the enclosure being mounted independent of movement of the cutting tool in and out of the work material. The mounting assembly comprises a depth adjuster for adjusting the operating depth of the enclosure. The depth of the enclosure can be adjusted such that the debris will be contained in the enclosure during operation.

Abstract: Handling device for an apparatus for the additive manufacture of three-dimensional objects, which handling device is equipped to handle an additively manufactured three-dimensional object, comprising: a handling chamber, which comprises a handling chamber interior delimited by one or more handling chamber walls, wherein at least one handling chamber wall comprises an access opening allowing access, in particular for a user, into the handling chamber interior, wherein the at least one access opening is openable and closable via a thereto assigned sliding-door-like closure element, which is mounted such that it is slidingly movable in a vertical direction between an open setting, in which the sliding-door-like closure element opens up the at least one access opening, and a closed setting, in which the sliding-door-like closure element closes off the access opening, relative to the handling chamber wall comprising the access opening.

Abstract: The invention relates to a table having a tabletop and including a refrigerating machine, at least one section of the tabletop being coolable by means of the refrigerating machine via a thermal contact; an upper vacuum chamber, which can be evacuated, for thermally insulating the thermal contact from a surrounding area of the table, said chamber connecting an upper face of the refrigerating machine facing the tabletop and the section to be cooled, and which has at least one flexible upper chamber section; a lower vacuum chamber, which can be evacuated, which is connected to a lower face of the refrigerating machine facing away from the tabletop, and which has at least one flexible lower chamber section; and a rigid stiffening structure, which is connected to the refrigerating machine via the flexible upper chamber section and via the flexible lower chamber section.

Abstract: In metal powder processing equipment where metal powder is sequentially laminated on a table inside a chamber and laser beam melting or electron beam melting, and shaping by a cutting tool subsequent to the melting are performed, unmolded powder remaining at the time of the melting and cut powder generated by the cutting can be scattered by generating air flow with respect to the cutting tool from either side of a main shaft or a tool holder. As a result, life of the cutting tool is prolonged and quality of a cut surface can be improved.

Abstract: The invention relates to a device (10) for machining work pieces, particularly for sharpening tools with cutters for cutting-machining, such as for example drills, milling tools or the like, the device (10) comprising a monolithic machine block (12) with at least two functional surfaces (14, 16) disposed at an angle with respect to each other, a work piece support arrangement (18) for clamping-in a work piece (38) to be machined, a machining unit (20), on which at least one tool (66, 68, 70) can be attached to machine the work piece (38), and a support (22), on which the machining unit (20) can be displaceably attached, wherein on a first functional surface (14) of the two functional surfaces (14, 16) of the machine block (12) the machine block (12) has at least one first linear guide (24, 26) for guiding a work piece support arrangement (18) along at least one first guide axis (X1), and on the second functional surface (16) of the two functional surfaces (14, 16) of the machine block (12) the machine block h

Abstract: A rotary cutter includes a pair of recessed receivers which receive the respective tip ends of a pair of electrode tips, and a through portion which runs through in a rotation axis direction and provides an opening that communicates with each of the recessed receivers. A cover case covers the lower recessed receiver of the rotary cutter and has a notch which is associated with the lower recessed receiver. Over the upper recessed receiver of the rotary cutter, a cover plate is fixed to cover the upper recessed receiver. An electrode tip insertion hole is cut through a center portion of the cover plate.

Abstract: A machine tool includes: a bed, the upper surface of which has the table provided thereon; a cut debris duct which is provided so as to extend rearward from a cut debris discharge opening open at the center, in the left-right direction, of the rear face of the bed, and which discharges cut debris from within the bed to outside of the machine tool; a bifurcated vertically movable body which vertically moves along a pair of vertical guides, and which straddles the cut debris duct, the pair of vertical guides vertically extending on the rear face of the bed at positions on both the left and right sides of the cut debris duct; and a pair of left and right feed screws which extend parallel to the vertical guides, and which move the vertically movable body along the vertical guides.

Abstract: A plant extraction assembly includes a housing that may be worn on a user's back. A flexible hose is fluidly coupled to and extends from the housing. A tube is fluidly coupled to a second end of the hose. A motor is coupled to a first end of the tube. A shaft is positioned within the tube. The shaft is rotationally coupled to the motor. A blade is coupled to the shaft. The blade is positioned at a second end of the tube so the blade may contact a plant positioned adjacent to the second end of the tube. A propeller is coupled to the shaft. The propeller provides from the second end of the tube into the tube. The propeller may urge pieces of the plant cut by the blade upwardly through the tube and the hose into the housing.

Abstract: The machine tool includes a saddle, a table which moves relative to the saddle, a telescopic cover fixed to the saddle, and a wiper fixed to the table. The telescopic cover protects a guide member which supports the saddle in such a manner as to be capable of moving with respect to the bed. When chips generated by the working of a workpiece placed on the table have deposited on the surface of the telescopic cover, the wiper fixed to the table removes the chips by the movement of the table and causes the chips to fall.

Abstract: A method of making a dental workpiece is provided. The method comprises the steps of suspending machining of the workpiece, exposing the workpiece to a first air jet; and causing relative movement between the first air jet and the workpiece under numeric control. The method may facilitate manufacturing of dental workpieces.

Abstract: A machine permits an end of a thick-walled, high-pressure tubing to be chucked in a collet one time, coned, faced and threaded, using a coning head and threading head which are mounted on a carriage which can be translated laterally between three positions and the coning and threading heads parallel to the longitudinal axis of the workpiece to complete the coning and threading operations.

Abstract: A chip and shaving collection system for a key cutting machine has a trough with a linear first trough drawer rail located on a trough first side and a linear second trough drawer rail located on a trough second side. The trough further has a linear first trough support rail having a general shape of a triangular prism located on a trough first side and a linear second trough support rail having a general shape of a triangular prism located on a trough second side. The system has a plurality of linear support beams located on the support rails. The system has a rigid planar grid member spanning the trough top located on the linear support beams. The system has a drawer that is fluidly sealed located in the trough. The system has a key cutting machine located on the grid member.

Abstract: Device for milling the welding region of spot welding electrodes, including at least one milling tool (21) with a cleaning unit (24) which is configured for cleaning the milling tool and has at least one movable mechanical cleaning element, such as a brush (26).

Abstract: To provide a chip disposal device of a machine tool which surely separates and collects a cutting fluid adhering to a chip lump, thereby capable of reducing an amount of the cutting fluid discharged to the outside of the machine. The chip disposal device includes a liquid separating part 65 which separates and collects a cutting fluid adhering to chips, the liquid separating part 65 has a mounting part 66 which is provided continuously from an inclined discharge surface 20a and is inclined so as to get lower as it goes more apart outward from the inclined discharge surface 20a, and to which a first chip lump a1 conveyed by a first scraping plate 36a is transferred. Then, the first chip lump a1 on the mounting part 66 stays on the mounting part 66 until dropping by being pushed by a second chip lump a2 conveyed by a second scraping plate 36b following the first scraping plate 36a.

Abstract: In a machine tool, a saddle is supported by a guide disposed on a bed. A cover protecting the guide is secured to the saddle and moves together with the saddle to enter or leave a space formed under a column. A chip intrusion stopper is attached to the column to prevent chips from entering the space when the cover and the saddle enter the space.

Abstract: Embodiments relate generally to milling machines and milling techniques, and more particularly, to apparatuses, milling machines and methods to control automatic loading and/or unloading of work pieces in relation to the adverse milling machine environments. In one embodiment, an apparatus includes a subset of guide members constituting a staging region, a loader member configured to impart a loading force unto the work piece to transition the work piece from the staging region, and an effector coupled to the loader member. The effector is configured to apply a cleaning force to a path in a first interval of time and is configured further to transfer the loading force from the loader member to the work piece in a second interval of time, and an alignment device configured to align the subset of guide members and the effector to form a portion of the path in a first mode.

Abstract: A suction cup dust extractor for a drill having a housing; a drill collar attached to the housing, having a drill passage formed through it; a recess formed by the walls of the housing having an opening and which, in use, locates against a work piece to create a chamber; a single aperture located on the housing through which air can pass; at least one first air passage formed by the walls of the housing which connects between the drill and the aperture to enable air to pass from the drill passage to the aperture; and at least one second air passage formed within the housing which connects between the recess and the at least one first air passage and which enables air to pass from the recess to the aperture via a part of the at least one first air passage; characterized in that there is a dividing wall which forms both one of the walls of the recess and one of the walls of the first passage, the at least one second passage being an aperture formed through that wall.

Abstract: Disclosed is a 3D reconfigurable machining system including a support frame spaced apart from the ground, a circular pivoting frame pivotably installed at the support frame, a slide member slidably installed on the circumferential portion of the pivoting frame, and a main spindle installed vertically at the slide member and being rotatable along the pivoting frame, so that a workpiece can be three-dimensionally machined with a considerably simple structure.

Abstract: A key cutting machine includes a housing, carriage, key clamp, and motor to drive the carriage. The key cutting machine may include a vacuum removably attached to the housing. The key cutting machine may be selected between manual, automatic, and semi-automatic user modes. Additional improvements or features of a key cutting machine are also described.

Abstract: A machine tool has a cover comprising a front cover and right and left side covers and includes a first slope part between the front cover and a table on which a workpiece is placed. The first slope part has slopes gradually declining from the center of the front cover toward left and right side covers. Further, the machine tool has also a second slope part that is connected to the left and right lower ends of the first slope part and has slopes declining rearward relative to the machine tool from the side of the front cover. If chips produced by machining are deposited on the surface of the first slope part, they are discharged onto the second slope part and into a contaminated fluid tank by a cutting fluid supplied from a nozzle.

Abstract: A machine tool has a cover structure adapted for the discharge of chips. The cover is composed of a front cover, left and right side covers, and a bottom part. The bottom part is connected to a bed through the respective lower ends of the front cover and the side covers. Further, at least a part of the bottom part includes a slope gradually inclining from the side connected to the bed toward the outer periphery. Even if the chips produced during machining adhere to members inside the cover, they are washed away by a cutting fluid and discharged into a cutting fluid supply device through a channel located farthest from the central portion of the machine tool.

Abstract: A machine tool includes a saddle supported by a guide member installed on a bed and configured to move relative to the bed in a first direction and a table supported by a guide member installed on the saddle and configured to move relative to the saddle in a second direction orthogonal to the first direction. The machine tool further includes a protective cover installed on a side face of the table or the saddle which is parallel to a travel direction of the table or the saddle and adapted to protect the guide member from chips and a scraper installed on the protective cover and adapted to scrape out chips built up in a neighborhood of the guide member.

Abstract: The machine tool includes a saddle, a table which moves relative to the saddle, a telescopic cover fixed to the saddle, and a wiper fixed to the table. The telescopic cover protects a guide member which supports the saddle in such a manner as to be capable of moving with respect to the bed. When chips generated by the working of a workpiece placed on the table have deposited on the surface of the telescopic cover, the wiper fixed to the table removes the chips by the movement of the table and causes the chips to fall.

Abstract: A cutting device may include a cutting unit having a cutter for trimming an edge portion of a workpiece or forming a groove in a workpiece. The cutting device may further include a base assembly configured to support the cutting unit with respect to the workpiece, and a grip device capable of being mounted to and removed from the cutting unit independently of the base assembly and configured to be capable of being grasped by a user during a cutting operation.

Abstract: A key cutting machine includes a housing, carriage, key clamp, and motor to drive the carriage. The key cutting machine may include a vacuum removably attached to the housing. The key cutting machine may be selected between manual, automatic, and semi-automatic user modes. Additional improvements or features of a key cutting machine are also described.

Abstract: A dust collecting case provided on a cutting machine for cutting a target object includes an outer case member and an inner case member. The outer case member includes a bottom plate, a first side member extending from a peripheral edge of the bottom plate, and a suction port. The inner case member includes a second side member positioned inside the first side member, and an upper member provided between an upper portion of the first side member and an upper portion of the second side member such that the upper member closes from above a space surrounded by the first side member and the second side member. The second side member includes an inner peripheral surface that faces and surrounds an outer periphery of the target object. A gap is located in between an outer surface of the second side member and an inner surface of the first side member.

Abstract: An apparatus for making variable diameter and shape holes through metal plates in a sheet plate machining gantry machine comprises two parallel cross members and two horizontal parallel guides integral with the cross members and supporting a horizontal cross arm which is controllably driven on the guides, the horizontal arm supporting horizontal parallel guides therealong is controllably driven an apparatus including a milling tool which can controllably driven in a vertical plane. The method comprises the step of controllably simultaneously driving a two-fluted mill both in a vertical plane (Z), and in a horizontal plane (U).

Abstract: A fastening nut for fastening a receiving body and a collet together is disclosed. The fastening nut comprises a main body having an outer surface, a first end, and a second end distal to the first end and a plurality of blades located radially on the outer surface of the main body, wherein each blade is at an angle to the second end. The fastening nut is attachable on the receiving body for coaxial retention of the collet. Furthermore, axial rotation of the fastening nut creates a suction proximate the second end of the fastening nut. In one embodiment of the fastening nut, the plurality of blades protrude axially past the second end of the main body in a direction away from the first end. A tool bit holding system and a system and method for machining specimens comprising the fastening nut are also disclosed.

Abstract: High precision machining is enabled by eliminating the need for a conventional swiveling table, and by enhancing rigidity for supporting a work by relatively reducing the distance from the top surface of a stationary body section (1) to the position for machining a work by means of a tool on a rotary spindle (17). A pair of guide tracks (28a, 28b) respectively passing two positions separated in the X axis direction of the stationary body section (1) and in the Z axis direction intersecting the X axis direction perpendicularly are allowed to guide feed tables (30a, 30b) to be movable independently.

Abstract: In the course of a machining of a workpiece with a tool, a drive spindle with a tilt table secured thereto of a tilt device provided on a work table of a machining center is rotated by a direct drive motor to control the relative angular position between the tool and the workpiece, and within a predetermined period of time in the course of a machining, the direct drive motor is rotated at a high speed with a spindle head and the work table of the machining center kept away to rotate the drive spindle and hence, the tilt table at a high speed, so that chips and cutting lubricant can be shaken from the workpiece and the tilt table.

Abstract: A chip discharge device for a machine tool is provided that has a simple structure, enables automatic replacement of tools, and is suitable for a machine tool in which a spindle head is turned about an axis of turning that is not parallel to the center axis of the spindle. A suction pipe 73 on the first support member side is disposed in parallel to a first axis of turning 191 to be centered on the axis of the through hole 192 of a first support member. A right end of the suction pipe 73 on the first support member side is fixed by bolts to a left end surface of the spindle head 18. An outer circumferential surface of the left end of the suction pipe 73 on the first support member side is connected to be able to relatively rotate to an inner circumferential surface at the lower end of a second communicating pipe 74. A seal mechanism 8 is provided in the connection portion, preventing the external air from being sucked into the second communicating pipe 74.

Abstract: A tool has a shank and a cutting blade mounted on the shank. The tool also includes an internal fluid passage for drawing in, together with air, chips produced when the cutting blade machines a workpiece. The internal fluid passage comprises a through hole made in the shank, at least one main inlet hole for drawing in the chips together with the air, the main inlet hole being made in the cutting blade and being in fluid communication with the through hole, and at least one sub-inlet hole for drawing in at least the air, the sub-inlet hole being made in the shank and being in fluid communication with the through hole. The chips can efficiently be discharged from the tool without being deposited in the internal fluid passage, by the air which flows at a suitable speed through the internal fluid passage and draws the chips, regardless of the diameter of the tool.

Abstract: Disclosed is a machining device, particularly for producing tooth replacement parts or models thereof, comprising a workpiece holder and at least one machining tool which is disposed in a machining space for a workpiece that is mounted therein. The feeding axis for the workpiece into the machining space extends at an angle relative to the horizontal.

Abstract: A device for the extraction of processing products includes a double-walled extraction hood, which has a first inner housing part and a second outer housing part arranged at a distance from the first inner housing part. The two housing parts are arranged coaxial with each other and partially within each other in such a way that an air channel is formed between the two housing parts. The air channel has a front end that can be aligned with the workpiece and a rear end opposite the front end. A flow directed from the front end to the rear end can be created in the air channel. The extraction hood, in particular the inner housing part of the extraction hood, is designed to accommodate at least part of the processing device and can be connected thereto.

Abstract: A machining device has a machine head capable of displacement along at least three translation axes X, Y, Z for machining an immobile part fixed above the machining head. The machining head is maintained in a constant orientation by at least three articulated connecting rods. Two connecting rods define together with the machining head and with a first Y carriage, on which they are articulated, an deformable articulated parallelogram in the XZ plane. Another connecting rod is articulated on the machining head and on a second Y carriage and the second Y carriage is capable of displacement along Y on a second X carriage capable of displacement along X. The relative movement along X of the Y carriages results in a displacement in the Z direction. Several devices can be positioned in a plurality of tunnels, these tunnels being arranged so as to share several things.

Abstract: A machine tool including a base frame, a workpiece table, a machining unit, and a connection portion is disclosed. The base frame has a machining area. The base frame includes two left and right side frames and a connection frame connecting the two side frames. The workpiece table is arranged on the base frame in the machining area. The machining unit is arranged on an upper portion of the base frame and includes a spindle device. A connection portion connects the machining unit and the base frame in a detachable manner.

Abstract: A machine tool for achieving a high degree of flexibility during workpiece processing comprises a machine bed with side walls arranged thereon, which respectively comprise a basic body with a front overhanging projection arranged thereon. On the side walls a tool spindle is arranged to be linearly movable by means of slides. Underneath the front overhanging projections a processing space is formed for the workpiece processing, in which a workpiece positioning unit is arranged. The processing space underneath the front overhanging projections is freely accessible, whereby depending on the processing task different workpiece positioning units can be arranged therein.

Abstract: A retractable dust containment device includes a forward ring, a collapsible cylindrical center portion, a stretchable rear cover, and draw strings. The forward ring is made from or covered by a plastic or soft material to prevent or reduce marring or damage to a work surface. The center portion includes a spring element pushing the forward ring away from the rear cover, and is enclosed by material to contain dust. The rear cover is a rubber like material and includes a window sized to allow a chuck and rotating drill elements to pass through and seat a non-rotating nose of the drill in the window. Draw strings pass through guides on the perimeter of the rear cover, attach to the forward ring, and are joined behind the rear cover, allowing the forward ring to be drawn to the rear to allow clear viewing on the work surface.

Abstract: An automatic machine tool, particularly for producing a dental prosthesis of exact three-dimensional shape, includes a machining unit (200), a workpiece feed unit (300), a tool feed unit (400) and an operating and control unit. The machining unit (200) includes a machining tool (430) that is displaceable in three spatial directions and has a cardanic workpiece holder receptacle (210) that can be pivoted about two axes, wherein the workpiece holder receptacle (210) is arranged vertically and the machining of the workpiece is carried out in vertical arrangement so as to allow the dropping of chips.

Abstract: A cutting tool cover set to a cutting tool which includes a hollow shaft body and at least one insert attached to an end face of the shaft body and cuts by bringing the insert into contact with a work while rotating the shaft body. The cutting tool cover includes: a body portion fixed to a top end portion of the shaft body; and an extension portion extended outward from the circumferential edge of the body portion in the entire circumference of the top end portion of the body portion to cover the surface of the work.

Abstract: A method for manufacturing LED light bars including steps: providing an LED light board comprising a first LED light bar, a second LED light bar and a connecting bridge interconnecting the first and second LED light bars; then providing a milling cutter and a retaining portion, wherein the milling cutter rotates and moves frontward to cut the connecting bridge along a side surface of the first LED light bar, and the retaining portion moves together with the milling cutter and keeps pressing against the side surface of the first LED light bar during cutting of the milling cutter to the connecting bridge. The retaining portion has a plurality of inhaling holes defined therein, which are used for sucking dust into the retaining portion during the cutting operation of the milling cutter to the connecting bridge.

Abstract: An apparatus for collecting weld tip chips created by a weld tip dresser is provided that “catches” the chips at the cutting tool and collects them in a container, preventing their disbursement on the factory floor. The apparatus includes a body adapted for connection to the weld tip dresser and with an opening therethrough configured to permit the weld tip dresser therethrough. The body defines an air inlet passage extending from an outer surface of the body to the opening. The body defines an air outlet passage from the opening to the outer surface. A pressurized air supply is connected to the body at the air inlet passage and is configured to blow air through the air inlet passage to blow chips from the opening through the air outlet passage. A container is operatively connected to the body at the air outlet passage for collecting chips blown from the opening.

Abstract: Scribing tool and dust collector for a router having a horizontally extending body which attaches to the router with a router bit extending along an axis of rotation through the body and projecting from a lower surface of the body for cutting engagement with an edge of a workpiece, a guide wheel mounted on the upper portion of the body for rotation about the axis, with an outer portion of the wheel projecting laterally from the body for engagement with a surface having a contour to be transferred to the edge of the workpiece by the router bit, a vacuum chamber within the body, an inlet port centered about the axis of rotation communicating with the vacuum chamber through a lower wall of the body, and a vacuum port communicating with the vacuum chamber for connection to a vacuum source to draw dust and chips produced by the router bit through the inlet port and into the chamber.

Abstract: A machine-tool spindle device includes: a spindle; a front housing for rotatably supporting the spindle; a first drive motor having a first rotor installed securely on the spindle and a first stator installed securely within the front housing; a rear housing installed on a rear end side of the spindle in the front housing; a second drive motor having an annular second rotor which is disposed coaxially to the spindle near a rear end of the spindle and which is supported rotatably within the rear housing, and a second stator installed securely within the rear housing; a connecting mechanism for connecting the rear end of the spindle and the second rotor and releasing the connection; and a clamping mechanism, disposed within the attaching hole of the spindle and within the second rotor, for clamping a tool attached to the spindle.

Abstract: A key cutting machine includes a housing, carriage, key clamp, and motor to drive the carriage. The key cutting machine may include a vacuum removably attached to the housing. The key cutting machine may be selected between manual, automatic, and semi-automatic user modes. Additional improvements or features of a key cutting machine are also described.

Abstract: A cutting method capable of efficiently removing cutting chips around a cutting point with a little electric power, and cutting a work with high accuracy with a ball end mill. The ball end mill has a slit shaped-opening part at a portion adjacent to a rake face of a cutting edge in internal communication with a suction passage, and a work in which a cutting liquid is previously coated on an inclined face of the work is cut while the cutting liquid is sucked in the area around the cutting edge from the opening part through the suction passage. As a result of this, the cutting liquid in the area around the cutting edge is sucked from the opening part and a cutting power decreasing rate is higher than in a case where the suction is not carried out.