Abstract: A dust collection assembly for a computer numerical control (CNC) cutting machine includes an adapter configured to couple to an arm of the CNC cutting machine and a head telescopically coupled to the adapter by a plurality of nested members. The CNC cutting machine includes the arm supporting a spindle and a tool holder coupled for co-rotation with the spindle. Each of the plurality of nested members are collapsible relative to each other. The head is movable between an extended position in which the nested members are configured to surround the tool holder and a tool bit, and a retracted position in which at least some of the nested members are telescopically received in the adapter. The head defines an inlet fluidly connected to the plurality of nested members when the head is at least in the extended position. The inlet is configured to fluidly connect to a vacuum.

Abstract: A dust suppression system for a jack hammer includes a spraying device that applies a fluid spray to an area surrounding the jack hammer. The spraying device includes a bracket connected to the jack hammer and a nozzle that creates the fluid spray. The system also includes a fluid source and a pump in fluid communication with the fluid source and the spraying device. The pump directs fluid from the fluid source to the spraying device. The bracket directs fluid from the pump and the fluid source to the nozzle.

Abstract: An object is to provide a nozzle controller which can constantly cool a tool in a machine tool. A nozzle controller of a machine tool includes: a tool which is gripped in a spindle of the machine tool; a nozzle in which the angle and/or the position thereof with respect to the tool can be changed and which emits a fluid to the tool; a nozzle drive unit which drives the angle and/or the position of the nozzle; a contact acquisition unit which acquires contact between the tool and a work; and a control unit which controls the nozzle drive unit. The control unit calculates, when the contact acquisition unit acquires the contact, based on a length of the tool and a stroke of a feed axis in the direction of the spindle, the angle and/or the position of the nozzle such that the fluid emitted from the nozzle hits a side surface of the tool, and controls the nozzle drive unit based on the result of the calculation.

Abstract: An effector includes at least one contact surface configured to bear against a face of a workpiece near a zone of the workpiece that is impacted by a tool supported by the effector. The contact surface includes at least one interface made of a ductile material interposed between the contact surface and the face of the workpiece.

Abstract: An apparatus for restoring a tool for fabricating a part from a composite laminate material including a contact member which includes a contact surface, wherein the contact member is adapted to be positioned within a bore of a wall of the tool such that at least a portion of the contact surface of the contact member aligns with a surface of the wall. The apparatus further includes a resilient member positioned with respect to the contact member such that an opposing side to the contact surface of the contact member, is positioned between the contact surface and the resilient member. A method is included for restoring a tool for fabricating a part from a composite laminate material.

Abstract: A machining thermostatic control system and method of using the same are disclosed. The system comprises a detecting unit, a processing unit and at least a cooling unit. The detecting unit is used for detecting the temperature distribution of a workpiece. The processing unit is coupled to the detecting unit and is used for processing the temperature distribution for obtaining a position of maximum hot spot of the workpiece. The cooling unit comprises a head which is provided for discharging cooling fluid and a plurality of blades which are angle-adjustably mounted to the head. The blades are coupled to the processing unit and the angle of blades are controlled by the processing unit for enabling the cooling fluid to flow toward to the position of maximum hot spot position.

Abstract: A reducer sleeve includes a reducer sleeve body that has an axial forward end and an axial rearward end, as well as a flange at the axial forward end thereof. The flange contains a first nozzle. The reducer sleeve body contains a first trough extending from the axial rearward end to the axial forward end. The first trough is in communication with the first nozzle whereby coolant is able to enter the first trough and flow along the first trough and into the first nozzle wherein the coolant is ejected by the first nozzle.

Abstract: A cutting tool (10, 36, 43) includes a coolant channel (22) having a coolant outlet (24) formed with an elongated shape, wherein a medial line (A) extending longitudinally along the coolant outlet (24) comprises a bend (60). The coolant outlet may be formed on a housing which is mounted on a tool body, or may be formed directly on the tool body itself.

Abstract: A tool holder includes: a shank portion gripped by a main shaft; a tool attachment portion having an insertion port into which a tool is inserted in a tip end surface thereof; a cover having a tubular wall that covers an outer periphery of the tool attachment portion and a bottom surface that covers the tip end surface of the tool attachment portion; a bearing provided between the tubular wall of the cover and the tool attachment portion; and a stopper that prevents the cover from co-rotating with the tool attachment portion. A through hole penetrated by the tool and an ejection port disposed on a periphery of the through hole in order to eject the coolant toward the tool are provided in the bottom surface of the cover.

Abstract: A cutting tool includes a coolant conveying member, to provide coolant fluid to a cutting area during a cutting operation. The coolant conveying member includes a member body having a fluid passage formed therein, and a nozzle to convey and to jet out the coolant fluid therethrough. The nozzle is shiftable relative to the member body, between a first, extended position and a second, retracted position. In the extended position, for example, assumed during the cutting operation—the nozzle extends out and forwardly from the member body, stabilized by the continuous flow of coolant fluid therethrough, forcing the nozzle forwardly. In the retracted position, for example, assumed when the when the coolant fluid does not flow through the coolant conveying member, or flows at a very low rate, the nozzle may be at least partially accommodated in the fluid passage, to allow, for example, indexing or replacing of the cutting insert.

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.

Abstract: Multiple fluid nozzles are mounted in a machine tool such that the cutting tool in the spindle is targeted with liquid or gas cutting fluid from multiple directions, providing better coverage and thereby more effectiveness. This provides more efficient and safer use of a machine tool by automating the aiming of fluids at a desired location. Multiple nozzles at respective multiple physical locations are preferably controlled by a single control unit, so they can be synchronized to maintain a common target point on a cutting tool, even if the nozzles are located asymmetrically or non-uniformly with respect to the spindle axis or target point. Preferably, modular nozzle assemblies can be configured for flexibility in mounting on the machine tool.

Abstract: The present invention is a coring unit adapted to be engaged to an articulated arm, to reduce the labor necessary for on-site coring of sewage and water pipes. The coring unit includes a frame containing the components of the unit, which include a coring bit, a coring bit motor, a traverse mechanism, and a stabilizer for allowing ready orientation of the coring unit with respect to an object being cored. The unit may also be provided with a traverse motor for driving the coring bit into an object being cored, and for withdrawing the coring bit once a core has been formed. The coring unit may additionally be adapted to allow for remote operation of the coring unit.

Abstract: A driven tool assembly that uses the cutting tool coolant to also lubricate and cool the driven tool. The driven tool housing has at least one coolant intake port, at least one coolant discharge port, and a shank for mounting the driven tool assembly to a machine tool. An input shaft and an output shaft are rotatably mounted in the driven tool housing, and a transmission transmits power from the input shaft to the output shaft. A seal is disposed between the housing and the input shaft. Typically, at least one passageway fluidly communicates the coolant intake port with the input shaft, the output shaft, the transmission, the bearings, and the coolant outlet port.

Abstract: A cooling assembly for a machine tool including at least first and second nozzle rings mounted on the spindle housing, respectively defining first and second coolant conduits and respectively including first and second pluralities of nozzles in fluid communication with the respective conduit. Each first nozzle is oriented with an outlet thereof directed toward a first machining zone containing cutting edges of at last one tool having a first length. Each second nozzle is oriented with an outlet thereof directed toward a second machining zone different from the first machining zone and containing the cutting edges of at least one tool having a second length.

Abstract: A device for the manufacture of drilled holes, cut-outs, plane surfaces or the like, includes an attachment structure, which is designed for the attachment of the device to at least one component to be machined, a feed device, which is designed to track a drill of a drilling machine, and a control device for controlling the feed device and a drilling machine. In one example, the feed device includes a support for the drilling machine, which is arranged substantially in the center of a crossbeam.

Abstract: A system for removing debris generated by a cutting tool draws the debris into a mixing chamber formed in a workpiece clamp where the debris is combined with a high velocity airflow. A vacuum source draws the debris-air mixture into a cyclonic airflow extraction chamber where the mixture is accelerated before being extracted from the clamp through an exhaust channel. A clamping ring seals the area surrounding the cutting site so that air velocity in the mixing chamber is increased and debris is accelerated into the extraction chamber.

Abstract: A pocket hole jig tool system includes a base on which a workpiece is supported. A drill guide support is slidably mounted to the base. Drill guide bushings are movably mounted relative to the drill guide support for clampingly engaging the workpiece and for guiding a drill for engaging the workpiece. A stop collar assembly is adjustably mounted relative to the drill guide bushings to automatically ensure a proper pocket hole location and depth for the workpiece inserted in the tool system.

Abstract: A programmable apparatus for cooling cutting tools including a pair of channels formed in the apparatus and formed from a pair of circular channel members, a nozzle associated with each channel to direct fluid onto the cutting tool, and control means to selectively direct fluid to the channels.

Abstract: A tapping tool having a guide body, a driver for longitudinal movement of a tap within the guide body, and a pump for lubricating the tap. A keyway in the outer body of guide body mates with an indexing key in a rotatable indexing holder of a turret press, which causes the guide body to rotate in sync with the turret press. A driver cylinder is centrally disposed in the guide body. The driver is adapted for sliding, mating engagement within the driver cylinder. A chamber in the lubrication pump holds the lubrication which is ejected by the pump onto the tap. Lubrication is ejected onto the tap through a normally closed ejector inlet that is opened by downward movement of a plunge pin against the lubrication in the chamber. The ejector is sized to restrict the flow of lubrication from the ejector outlet, which creates back pressure in the lubrication chamber. The back pressure forces a ball to close the lubrication conduit when the plunge pin moves downward.

Abstract: In a machine tool with at least two axes of movement (2, 7) defining, respectively, the mobility of a first function-supporting unit (1) and of a second function-supporting unit (5), only the first function-supporting unit (1) is provided with its own servo drive, while the second function-supporting unit (5) is driven by the movement of the first function-supporting unit (1) through a coupler unit (13) that can be switched between an engaged and a disengaged state.

Abstract: A control module for a nozzle arrangement, including at least one two-component nozzle for spraying a gas/liquid mixture on the zones of action between a tool and a workpiece is characterized by a gas supply line for pressurized air and a liquid supply line for pressurized liquid, both leading to the two-component nozzle, a liquid check valve in the liquid supply line, a control device to be actuated by the pressurized gas for opening or closing of the liquid check valve, a packing disposed downstream of the liquid check valve, a branch line in the form of a capillary tube extending from the packing to the or each two-component nozzle.

Abstract: A reference block 30 attached to a housing 20a is moved together with a main spindle 20 to a measurement start position A1, and the reference block 30 is so moved in a Z-axis direction as to across air injected from an air injection nozzle 25, so that a thermal displacement of the main spindle 20 is calculated based on change in pressure measured in the movement. The outer circumference of a tool mounted on the main spindle 20 is brought close to a leading end face of the air injection nozzle 25, and the air is injected to the outer circumference of the tool while rotating the tool at a predetermined position, and the air pressure is measured so that the rotational deflection of the tool is calculated based on the change in the measured pressure.

Abstract: A tool holder includes an insert having an annular channel in fluid communication with an inlet. The insert mounts within a body that provides for rigidly mounting the tool to the machine. Coolant flow through the inlet and annular channel exits the insert through passages directing coolant fluid along the axis of the tool. The passages are annularly disposed about a face of the insert for directing coolant fluid along the tool.

Abstract: There is provided a method for machining a deep hole, which enables prevention of scattering of a coolant and efficient discharge of shavings. The deep hole machining method includes: feeding a spindle to a deep hole machining start position while jetting a coolant toward a workpiece from an external normal pressure coolant supply line; closing the external normal pressure coolant supply line and opening a spindle normal pressure coolant supply line at the start of machining of a deep hole, and machining the deep hole to a predetermined intermediate depth while supplying a coolant to a machining point; and closing the spindle normal pressure coolant supply line and opening a high-pressure coolant supply line when the depth of the hole machined has reached the intermediate depth, and machining the deep hole to the final depth while supplying a high-pressure coolant to a machining point.

Abstract: Described herein is a system for generating a plurality of coolant beams that converge at a focal point for advanced heat transfer. The system utilizes a variable strength activation of coolant and superposition of coolant beams generated by multiple actuators for increased cooling strength increase, thereby avoiding activation saturation in conventional systems. Each coolant beams is activated to carry an ultrasonic or megasonic vibration component. In addition, the system includes a coolant activation assembly having a plurality of actuators for generating the coolant beams. The coolant activation assembly further includes supporting components for positioning the actuators so that all of the coolant beams generated by these actuators converge at the focal point. Experimental results show that the system provides significantly improved workpiece quality in a machining process. Compared with the most advanced existing system, this system offers a further improvement of up to 12.

Abstract: A water treatment pad for core drill, attached on a drilling surface in performing drilling work while supplying cutting water with a core drill, wherein the water treatment pad for core drill comprises: a roughly cylindrical pad main body 10 mounted to surround the core drill and having a drain outlet on a side surface; an inner wall plate 20a detachably attached on the inside of the pad main body and formed into an arc shape in cross section when attached and wherein a pressure space communicating with the drain outlet is formed between the inner wall plate and an inner surface of the pad main body. As an attachment structure of the inner wall plate 20a, preferably, the guide 12 formed with a fitting groove 13 in the top rear face of the pad main body 10 is provided on a circumference thereof so that the inner wall plate 20a is fitted.

Abstract: A chip removal method removes residue such as chips that have remained in and adhered to an interior of a bag-shaped machined hole in a work piece. After air is jetted out and blown against a bottom portion of the machined hole by using an air blow nozzle to change a flow of air that is circulating inside a nozzle into a spiral flow that moves in a direction towards the bottom portion of the machined hole, this spiral flow then blows upwards like a tornado from a vicinity of the bottom portion of the machined hole in a direction towards an aperture portion of the machined hole so that the residue inside the machined hole is uplifted by the spiral flow and removed.

Abstract: The invention relates to a device for producing a metal strip (1) by continuous casting, using a casting machine (2) in which a slab (3) is cast. At least one milling machine (4) is arranged in the direction of transport (F) of the slab (3) behind the casting machine (2) in which at least one surface of the slab (3), preferably two surfaces which are opposite to each other, can be milled. According to the invention, in order to optimise the service life of the milling cutter of the milling machine, means (5) for cooling the milling cutter (6) are provided on or in the milling machine (4). The invention also relates to a method for producing a metal strip.

Abstract: A timing element for a lubricant supply system is capable of using pneumatics for the time of delivery of lubricant for a preset duration. In one example, the timing element has a cavity having an entrance and an exit, a first piston and a second piston. The first piston and the second piston are disposed in the cavity. The first piston is coupled to the second piston in such that compressed air in the entrance of the cavity is capable of moving the second piston and closing the exit. A pneumatic timing element may be incorporated into a dosing unit that is capable of supplying an amount of lubricant in a mist to a plunger bushing of a machine tool without. The duration of the dosing may be controlled solely by pneumatics and may prevent excess pooling of lubricant in bore holes by shutting off lubricant delivery at a preset time.

Abstract: An eyeglass lens processing apparatus includes a lens holding unit for holding an eyeglass lens, a roughing tool, a finishing tool, a drilling tool, a processing water supply unit for applying processing water to a processed part of the lens held by the lens holding unit, and a controller for controlling driving operations of each of the processing tools and the processing water supply unit in order to execute roughing for the lens by the roughing tool without application of the processing water, drilling for the lens by the drilling tool without the application of the processing water after the roughing and finishing for the lens by the finishing tool with the application of the processing water after the drilling.

Abstract: A coolant nozzle is used in a machine tool having a rotating bit. The nozzle includes a through-aperture for accommodating the bit. The nozzle has a coolant inlet and a number of coolant outlets at more than one angular position about the through-aperture. Internal surface portions define one or more passageways between the inlet and the outlets.

Abstract: A milling head has a body, a holding device, a driving axle, a spraying device and a tool adaptor. The body has a base, a rear cover, a front cover, a bearing seat and a middle liner ring. The holding device is connected to the body and has a linking arm, a mounting jacket, a bottom cap, a positioning shaft and a locating spring. The driving axle is rotatably mounted in the body and has a transmission shaft and a driving bevel gear. The spraying device is mounted on the base and has a mounting cover and an spraying ball. The tool adaptor is rotatably mounted in the base below the spraying device and has a transmitting bevel gear, a holding head and a connecting segment.

Abstract: An adaptor (20, 76, 104, 106) secures a cutting head (16) to a tool holder (12, 14) having a passage for fluid. The adaptor (20, 76, 104, 106) has a corresponding passage (68, 94) for fluid to which a nozzle (22) is connected for the distribution of fluid towards a cutting region (54) of the cutting head (16).

Abstract: The present invention relates to a system that allows an operator to remotely switch between cutting and boring while removing solid carbonaceous residue from large cylindrical vessels called coke drums comprising a cutting head for ejecting high pressure fluids into the coke bed; a flow diversion apparatus; and a shifting apparatus.

Abstract: An exchangeable spindle assembly for a machine tool. The spindle assembly includes an assembly attachment coupling being connectable to said machine tool, a tool spindle having a predetermined spindle diameter, and a spindle drive coupling being connectable with a drive mechanism of the machine tool. The drive coupling communicates with the tool spindle whereby rotation of the drive coupling effects rotation of the tool spindle. The spindle assembly further includes at least one coolant distribution manifold being connectable with a coolant supply source on the machine tool via a coolant connection on the spindle assembly. The spindle assembly being arranged in a manner whereby upon mounting the spindle assembly on the machine tool, the assembly attachment coupling, spindle drive coupling and coolant connection are all concurrently connectable to the machine tool. Additional connections may be included.

Abstract: An apparatus for dislodging and removing contaminants from a surface of a machine tool. The apparatus includes an arbor, a vacuum source, a tube, and a cleaning member disposed proximate a distal end of the tube. The cleaning member contacts a surface of the machine tool to dislodge contaminants. The contaminants are drawn through the tube by the vacuum source.

Abstract: A controlled atmosphere cutting method and a cutting tool are provided to prevent wear on the cutting tool when cutting is performed on a material for forming an oxide protective film. According to the invention, in a cutting method of supplying gas in an atmosphere of a machining portion to perform cutting when a work piece is cut, gas containing a high concentration of oxygen is supplied as atmospheric gas to bring the machining portion into an oxidized atmosphere, so that an oxide is formed between the cutting edge of a cutting tool 4 and a workpiece and thus a damage and wear are reduced on the tool. The above-mentioned atmospheric gas is oxygen enriched air in which oxygen in the air is condensed, and the atmospheric gas has an oxygen concentration up to 40%, exceeding an oxygen concentration of the air.

Abstract: In an embodiment, a drill nozzle includes a housing having a bristle brush ring attached. The housing of the drill nozzle may include an air intake, multiple coolant inlets, multiple coolant jets, a vacuum tube, and mounting flanges. The air intake may provide a thrust-vectored down draft into the vacuum tube. The coolant inlets may receive coolant fluid that may be expelled from the coolant jets towards a drill bit. Drilling debris and coolant fluid may be contained inside the bristle brush ring preventing damage and soiling of surrounding structures and areas and may be extracted with the vacuum tube. The drill nozzle may be attached to a drill motor unit of a numerically controlled drill jig, enabling the use of such numerically controlled drill jig for drilling high quality holes effectively into non-flat surfaces, for example, the leading edge extension spar of the F-18 aircraft.

Abstract: An electrical hand-held tool (1) includes a working tool-side assembly (2) located in the tool outer housing (3), a cooling fan (4) also located in the outer housing (3), at least one cooling air conduit (5) extending between a working tool-side end of the assembly (2) and the cooling fan (4), and barrier element (7) provided on a cooling fan-side of the cooling air conduit (5) in the vicinity of the cooling fan (4) and having a barrier opening (14) that opens toward the cooling fan (4).

Abstract: A toolhead for use on a multi-axis machine tool consists of a support assembly equipped with a pivoting spindle designed to accept a removable tool-holder, and centered on a machining axis about which a tool clamped to the tool-holder can be driven in rotation. Also forming part of the toolhead is a depth stop affording an active surface substantially transverse to the machining axis and positionable against a surface of a workpiece. The depth stop is mounted to the support assembly and capable of movement along the machining axis between a first position, distanced from the spindle, and a second position of proximity to the spindle. Transducers incorporated into the toolhead are able to sense the position of the active surface relative to the support assembly, and thus used to control the depth to which the workpiece is penetrated by the tool.

Abstract: A drill nozzle includes a housing having a bristle brush ring attached. The housing of the drill nozzle may include an air intake, multiple coolant inlets, multiple coolant jets, a vacuum tube, and mounting flanges. The air intake may provide a thrust-vectored down draft into the vacuum tube. The coolant inlets may receive coolant fluid that may be expelled from the coolant jets towards a drill bit. Drilling debris and coolant fluid may be contained inside the bristle brush ring preventing damage and soiling of surrounding structures and areas and may be extracted with the vacuum tube. The drill nozzle may be attached to a drill motor unit of a numerically controlled drill jig, enabling the use of such numerically controlled drill jig for drilling high quality holes effectively into non-flat surfaces, for example, the leading edge extension spar of the F-18 aircraft.

Abstract: A coolant assembly for supplying coolant fluid to a tool includes an outer ring defining an inlet and an insert pressed within the outer ring including an annular channel. The annular channel is in communication with the inlet defined by the outer ring and includes a plurality of passages disposed to direct fluid along an axis of a tool. At least two of the passages are disposed at different angles relative to the axis of the tool to direct coolant along the entire length of the tool in order to provide a uniform and consistent stream of coolant and uniform and consistent temperature of the tool.

Abstract: An automatic tool changing device capable of cleaning a contact surface of a spindle, which is to be in contact with a tool holder, with a simple structure. The device includes a turret having a plurality of grippers on its outer circumference and holding the tool holder by means of the grippers. At the time of tool change, the grippers grip and pull out the tool holder fixed to the spindle. Rotation of the spindle causes the turret to rotate through a spindle gear, a turret gear, and a decelerating device, to thereby select a tool. At this moment, a coolant is spouted from a nozzle portion of a manifold toward a spindle taper hole in which the tool holder is interfitted and washes the taper hole. Due to the rotation of the spindle, the coolant is spouted onto the whole circumference of the taper hole, and the surface to be in contact with the tool holder is surely washed.

Abstract: A method and apparatus for directing a coolant stream onto a cutting tool is made up of a nozzle pivotally mounted on a machine tool, the nozzle being automatically adjusted in response to movement of the machine tool via a retractable plunger or other linear drive member so as to cause the coolant stream to intersect the interface between a workpiece and each cutting tool that is brought into cutting position on the machine tool; and the nozzle is pivotal between a reference position and a different intermediate position corresponding to the length or diameter of the cutting tool which is advanced into cutting position.

Abstract: A coolant system for a machining center includes a cutting tool selectively engageable with a work-piece and includes a pump for supplying a flow of coolant to the cutting tool, a motor drivingly engaging the pump, a pressure transducer measuring the pressure of the coolant being supplied to the cutting tool and a controller in communication with the pressure transducer and the motor. The controller compares the pressure measured to a predetermined target pressure and varies the speed of the motor to minimize deviation of the measured pressure from the target pressure.

Abstract: A programmable coolant nozzle system includes a coolant fluid nozzle fixed to a manifold so that the centerline of the nozzle and the centerline of the manifold block are perpendicular. This feature allows coolant fluid to be rotatably directed from the nozzle at great pressure and/or volume with an actuator that does not have to withstand severe tortional force. The invention includes a method which allows coolant fluid to be rotatably directed from a nozzle assembly and to be commensurate with any change in position of the working tool of a machine tool center.

Abstract: A method and apparatus for directing a coolant stream onto a cutting tool is made up of a nozzle pivotally mounted on a machine tool, the nozzle being automatically adjusted in response to movement of the machine tool via a retractable plunger or other linear drive member so as to cause the coolant stream to intersect the interface between a workpiece and each cutting tool that is brought into cutting position on the machine tool; and the nozzle is pivotal between a reference position and a different intermediate position corresponding to the length or diameter of the cutting tool which is advanced into cutting position.

Abstract: The present invention relates to a nozzle for use in a metalworking process, whereby the nozzle is designed to precisely deliver an oil-containing liquid and non-flammable gas mixture onto the interface between a metalworking tool and a workpiece, whereby the nozzle is comprised of a tip and a valve body affixed to one another. Furthermore, the present invention relates to a method for cooling and lubricating a tool and workpiece during a metalworking process.

Abstract: A spindle device of a machine tool capable of preventing coolant mist from being excessively liquefied in an area between a mist outlet member 23 and near the rear end part of a tool 29, wherein a straight feed pipe 14 formed of a double tube having an inside tube 14a and an outside tube 14b is inserted into an inside hole formed at the center part of a spindle 2 in non-rotating state not coming into contact with the spindle, coolant is fed to the inside tube 14a, compressed air is fed to the outside tube 14b, and a mist generating member 16 is formed of both tubes near the inside tip part of the spindle, a mist outlet member 23 is installed into the outside tube 14b integrally with each on the mist outlet passage c of the mist generating member 16 so as to surround the mist outlet passage and a mist guiding extension member 24 allowed to reach near the rear end part of the tool in the center hole of the tool holder is installed, integrally with the spindle, on the other tool holder 8 side, and the mist guidi