Abstract: A clamping device has a collet or a sleeve that contains an inner coolant supply. The non-through parts of the clamping device have formed therein radial slits and/or intermediate slits that open at the machine side and/or the tool side of the shank of the device. The slits and non-through parts of the device are arranged in such a way that they form a coolant barrier.

Abstract: A magnetic based drill assembly comprising a support platform mounted to the magnetic base for attachment to a work piece includes a feed mechanism operatively connected to the platform for rectilinear movement between a fully retracted position and a fully extended position. The feed mechanism includes a splined collar slidably mounted to the splined arbor for movement relative to the splined arbor and for rotatably supporting a drive tool. The motor is mounted in a stationary position offset and substantially parallel to the feed mechanism to reduce overall height and weight of the drill assembly. As the splined arbor is located within a cylindrical feed arbor a liquid coolant can be directly injected on the drill tool and workpiece during operation of the drill assembly. Further, an electrical feed rate monitor provides a signal to the user to indicate the optimal feed rate of the drill tool.

Abstract: The device is equipped with a taper shank (23), a stationary member axially tapered shape (33), and a connecting member (49). The taper shank (23) is fitted in a deep portion of a shank receiving portion with a taper bore (5) formed at the tip portion of a spindle in such a manner that installation and removal are possible, and is fixedly connected to the spindle (3). The stationary member (33) is rotatably connected to the taper shank (23), and is located in the taper bore (5) with a clearance (35) and has a spray nozzle (37) for spraying cleaning fluid into the taper bore (5) and an inside passage (39). The connecting member (49) is connected, at one end thereof, to the stationary member (33) and is connected, at the other end thereof, to a supply block (13) located at the tip portion of a spindle head (1), and has a connecting passage (53) for continuously connecting a supply hole (15) and the spray nozzle (37).

Abstract: The invention therefore provides a tool holder for tools supplied with coolant or lubricant, especially rotating tools such as boring or milling tools, with an internal duct system for passing coolant or lubricant to the shank of the tool. To enable particularly flexible use of machine tools, the tool holder is equipped according to the invention with a lubricant reservoir which is integrated into the tool holder and which is preferably fillable and pressurizable, which during operation of the tool can be decoupled from a coolant or lubricant source and supplies the tool controllably with coolant and lubricant via a metering unit.

Abstract: A drilling device for drilling with diamond tools has a drilling head having a drilling head housing, a drilling shaft rotatably supported in the housing, the drilling shaft having a tool side and being provided with a receiving opening for a drilling tool and extending from the tool side, the drilling shaft being formed as a hollow shaft over a part of its axial length, a drive having a rotary spindle, coupling means for connecting the drilling shaft with the rotary spindle of the drive, the drilling shaft being provided with at least one radial interruption for connecting an interior of the drilling shaft with an interior of the drilling head housing, the drilling head housing having an opening for selective connection of a supply conduit for a cooling/lubricating medium and a suction conduit for drilled material, and a clamping element for releasably connecting the drilling head with a clamping neck of the drive.

Abstract: A tool is proposed for the machining treatment of bore surfaces, consisting of at least two component tools that can be displaced with respect to each other, both of which are provided with machining arrangements, wherein an inner component tool is guided inside an outer component tool, in that the tool (1) comprises a primary piston (13) that--for the purpose of carrying out an extended movement of the inner component tool (7)--can be charged with a certain medium under pressure, in that the primary piston (13) during the extended movement of the inner component tool (7) displaces a medium via a connection channel (25) into an equalizing chamber (27), and in that the equalizing chamber (27) is in the form of a concentric annular chamber, arranged about the axis of rotation, in which an equally annular-shaped compensating piston (29) is movably arranged.

Abstract: A main spindle apparatus for machine tools wherein a tool holder (T) having an anchoring edge on an inner circumferential surface and inserted into an attachment hole of a main spindle (1) is anchored to the main spindle (1) by expanding a collet (12) having an anchoring portion on the outer circumferential surface so that the anchoring portion engages with the anchoring edge. Pressure receiving surfaces (12b, 12c) which gradually decrease in diameter in approaching the tip are formed on the inner circumferential surface of the collet (12). The main spindle (1) is provided with a push rod (2) which expands the collet by means of pressure applying surfaces (2d, 2e) formed on the outer circumferential surface and gradually decreasing in diameter in approaching the tip, which press the pressure receiving surfaces (12b, 12c) of the collet (12) when the push rod (2) is moved forward so as to approach the tool holder (T).

Abstract: A tool detection system combines a sensor nozzle with an ultrasonic transducer capable of propagating and detecting ultrasonic waves. A wave is propagated in a coolant fluid stream directed at a tool to be monitored. A control unit powers the ultrasonic transducer and contains circuits for analyzing the ultrasonic waves detected by the ultrasonic transducer. The control compares the actual time between the propagation of an ultrasonic wave and detection of an echo wave reflected from the tool, to an expected time. An alarm is generated when the tool is not present as indicated by the actual time exceeding the expected time. An alarm signal generated by the alarm generator either stops the tool or signals an operator that the tool is absent.

Abstract: A power driven pipe threading machine is provided with a coolant system by which an oil free, glycol based coolant is dispensed onto the workpiece during thread cutting in the area thereof adjacent a thread cutting die at a rate which provides for the coolant to completely evaporate and for the workpiece to be cooled to a temperature which provides a good quality thread. The coolant is pumped from a reservoir to a coolant outlet on the die head of the machine and through a needle valve by which the discharge rate is adjustable, and a torque responsive shut-off valve is associated with the die head for controlling the flow of coolant from the reservoir to the needle valve and coolant outlet in response to initial threading engagement between the workpiece and cutting dies on the die head.

Abstract: Rotating shaft tool with a shaft, in which at least one main channel for coolant/lubricant is provided, extending in the longitudinal direction, with a cutter head connected to the shaft and having chip grooves and a groove discharge region, with a sleeve which extends between the groove discharge region and the shaft and which covers at least one feed channel formed between the main channel and the groove discharge, characterized in that the at least one feed channel is provided substantially parallel to the longitudinal mid axis of the shaft and of the cutter head, and has a transition, free from sharp bends, from the main channel to the feed channel and from the feed channel to the groove discharge region.

Abstract: A method of for performing a machining operation and recovering a liquid used in the machining operation. The method includes the steps of providing a machine tool to perform a machining operation, directing a liquid against at least one of a) a part of the machine tool and b) a workpiece on which the machining operation is being performed by the machine tool in such a manner that discrete particles become entrained in the liquid, directing at least a part of the liquid with the discrete particles entrained therein to a first location, and at the first location separating the liquid from the discrete particles.

Abstract: The invention is an arrangement whereby fluid dynamics is used to provide a cooling effect to a cutting tool while in use. More specifically, the invention is based upon the principles that fluid expands when sent through a restricted diameter channel which concomitantly to expansion and reduced pressure also causes a markedly reduced temperature of the arrangement. A cooling element comprising a long, restricted channel arranged on a support plate in a tightly spaced continuous pattern and having an inlet for any desired cooling fluid and an outlet. Cooling fluids can be contained within the system for indefinite reuse or can be cycled through (i.e. air or water). Preferred cooling fluids are tap water or ambient air.

Abstract: A holder for a tool comprises a tapered hollow shaft, having an upper opening, for clamping into a tool receptacle, and a coolant tube arranged in the interior of the tapered hollow shaft for delivery of coolant to the tool. The coolant tube comprises an inlet opening for coolant, facing the upper opening, as well as an upper tube section having a cylindrical outer enveloping surface with which, when the holder is clamped into the tool receptacle, a sealing ring, which is arranged in a delivery tube for coolant which then at least partly overlaps the coolant tube, is in contact. A cover for the inlet opening is provided, which prevents chips from getting into the coolant tube. In addition, a further tube section, the outside diameter of which is smaller than that of the upper tube section, adjoins the upper tube section at the bottom.

Abstract: A spindle unit for machine tools, with a working spindle that is provided to accommodate a tool and is mounted so it can rotate in a housing and is driven by a motor, and with a chucking unit with an operating device and an internal coolant supply to the tool. A short and compact spindle unit is created according to this invention by the fact that the internal coolant supply is integrated into the chucking unit and has a rotary transmission lead-through mounted inside the operating device to convey the coolant from a stationary supply line into the chucking unit.

Abstract: A chip adhesion preventing device is capable of preventing chips from adhering to the drill shank of a drill held on a spindle (1) included in a boring machine. Fluid passages (17, 23) are formed in the spindle (1) and a work holding member (19), respectively, and nozzle holes (18 and 22) are formed in the spindle (1) and the work holding member (19) so as to be connected to the outlet ends of the fluid passages (17 and 23), respectively, and to be directed toward the shank (13) of the drill (3). A high-pressure fluid is jetted through the nozzle holes (18, 22) toward the drill shank (13) to blow off chips (15) adhering to the drill shank (13).

Abstract: A quill stop for a milling machine, drill press, or other like machine. The quill stop includes means for automatic control of coolant flow. The quill stop includes a passage through which high pressure air flows. A valve in the passage controls the air flow. The valve is activated by contact of the quill stop with a dog stop on the machine. The quill stop may also include a self contained mist unit activated by the valve.

Abstract: An improved device and method for use in machining a workpiece, which includes a tool body with a machining tool having two machining surface, wherein one of the machining surfaces is being selectively movable between a retracted position and an extended position. A supporting mechanism is sized and configured to substantially restrict movement of the machining tool relative to the tool body while the one machining surface is positioned in the retracted position. Preferably, the supporting mechanism includes an interior surface having a frustoconical-shaped tapered configuration, and the reciprocable machining surface has an engageable surface sized and configured to be frictionally engaged against the interior surface. In a preferred embodiment, the interior surface has an angle relative to the longitudinal axis of the tool body from about 20 to about 50 degrees, and more preferably about 40 degrees.

Abstract: An attachment for a rotating tool bit provides air flow in the vicinity of the work area without the need for separate vacuum or compressed air supplies. The device is mounted on the shaft of the rotating tool bit and provided with a plurality of vanes which direct airflow through a cylindrical housing towards or away from the work area. A central aperture provides resilient mounting of the attachment to the tool bit. The attachment is capable of providing suction as well as forced-air to the work area. A number of embodiments are disclosed for directing the exhausted air in different directions, depending on the application of the tool and operator orientation. A filter may be incorporated into the attachment in order to collect dust and debris carried away from the work area by the air flow.

Abstract: A spindle head for tools with interior coolant feed can be inserted in a tool face with receiving and holding bores. A tensioning device for the spindle carries the shaft of the tool and is mounted rotatably in the spindle head housing by a spindle end segment. A coolant conduit is located in a spindle head cover on the tool side and above the spindle mounting. An annular groove open toward the spindle end segment is provided in the spindle head cover. A coolant feed passage opens into the annular groove. The end segment of the spindle has a connecting passage with one end opening in the annular zone of the outer surface of the end segment aligned with the annular groove and with another end opening in a chamber of the spindle. An inlet opening of the coolant passage in the shaft end of the tool is connected with the chamber. The annular groove is sealed on the outside by an exterior gap tightening and on the inside from the spindle mounting by an interior gap tightening.

Abstract: A drill incorporates an axial feed drive, measuring system for determining the feed distance, a computer for controlling the axial feed drive as a function of the axial feed distance and a rotary drive for driving the tool spindle with pre-established on-load speed or pre-established torque or load moment. The flow or feed of cutting lubricant to the tool is controlled as a function of the pre-established on-load speed or the combination of the pre-established load moment, and the axial feed.

Abstract: A tool holder includes a body with a central internal threaded section, and a coolant coupling device within the tool holder. The coolant coupling device includes a threaded body section to engage the internal threads of the tool holder, a smaller diameter nose section, and a coolant passage through the device to align with a coolant passage in a cutting tool. A sealing ring around the end of the coolant passage forms a seal when the coolant coupling device abuts against a tool shank. The body section includes a wrench slot by which to turn the device for axial movement within the tool holder.

Abstract: Fluid dispensing and control system for tapping attachments includes a controller mountable upon a machining center and connectable between the tapping attachment and a source of cutting fluid, as well as to the machine's recirculating coolant flow. Connection of the tapping attachment to the machine through the controller determines whether cutting fluid or coolant will circulate to the tapping attachment.

Abstract: A tool turret has a brake to retain the turret in an an index position. The brake has stationary and rotatable brake members, each formed with a cone-shaped braking surface and a radial or face braking surface. A tooling plate carries a plurality of cutting tools and is mounted on the rotatable brake member. When the brake members are moved toward one another, the cone-shaped braking surfaces engage and the face braking surfaces engage in an indexed position in which one of the cutting tools is brought into a position for engaging a workpiece. When the brake members are disengaged, a motor turns the rotatable brake member and the tooling plate to another indexed position. The cone-shaped braking surfaces are mounted on flexibly resilient braking elements of the brake members to enable them to flex upon initial engagement of the cone-shaped braking surfaces, so that further movement of the brake members towards one another into full engagement with the face braking surfaces is permitted.

Abstract: A spindle device in which a coolant passage 26, capable of being selectively connected to a main passage 17, is provided at downstream of the main passage 17, an air passage 32, capable of being selectively connected to the main passage 17, is provided externally of the coolant passage 26, a first open-close means 20 is provided between the main passage 17 and the coolant passage 26, and a second open-close means 30 is provided between the main passage 17 and the air passage 32, whereby when the tool is clamped, the first open-close means 20 is opened to connect the main passage 17 with the coolant passage 26 and the second open-close means 30 is closed to cut-off the connection between the main passage 17 and the air passage 32 whereas when the tool is unclamped, the first open-close means 20 is closed to intercept the connection between the main passage 17 and the coolant passage 26 and the second open-close means 30 is opened to connect the main passage 17 with the air passage 32.

Abstract: A tool for precise machining of metal includes two tool parts located one within the other and formed as an inner tool and a tool head respectively, and coupling elements which enable automatic replacement of the tool.

Abstract: A generating head assembly for cutting or machining a surface on a workpiece and including a generating head mounted for relative rotation with the workpiece and with cutting or machining members having a radially advanced cutting or machining position for cutting or machining the surface of the workpiece and a radially retracted non-cutting on non-machining position; the generating head assembly includes an actuating structure for providing relative rotation between the generating head and the workpiece and a rotary motor mounted with the generating head; the rotary motor is selectively operable to rotate an actuating shaft relative to the generating head to actuate the cutting or machining members to their radially advanced and retracted positions without axial thrust loads being applied to the generating head.

Abstract: A controlled atmosphere machining process which involves a work station for machining a workpiece with an inert gas in an enclosed environment which will not support combustion. The process further includes a vacuum system which removes particulate matter occurring during the machining process and transports the matter to a collecting tank. The inert fluid is recycled through a filter and cooling system and continues to be drawn by the vacuum system into the enclosed machining area of each work station.

Abstract: A threaded hole may be formed in a lid of an underground petrol tank without emptying the tank or removing the lid, using a tool (FIG. 3) having a taper tap section (61), an intermediate tap section (62) and a final tap section (63). At the leading end of the tool, there is a reamer section (60) and supported on the free end of the tool is a centerless hole cutter (50). A resilient mounting transmits drive from the main part of the tool to the cutter (50), but allows the cutter to float. A sleeve (23) surrounds the tool, so that a column of inert gas may be caused to lie in the cutting region. A magnet (57) mounted within the cutter (50) catches and holds a released disk of the cover. Also described is a rig (FIG. 1), for operating the tool (FIG. 3), and a method (FIG. 5) of securing a collar threaded into a hole formed by the tool.

Abstract: An automated air-burst control device is provided for use with a machining tool to clear away fragments of a work piece being machined. The air-burst control device includes an inlet pneumatically communicating with a source of compressed air. A control valve pneumatically communicates with the inlet, and is movable between open flow and closed flow conditions. The control valve is normally disposed in the closed flow condition for blocking air flow from the inlet through the control valve. An actuator is operatively connected to the control valve, and responsive to a triggering event for moving the control valve into its open flow condition to release air flow from the inlet through the control valve. An air flow outlet line pneumatically communicates with the control valve, and has a free end thereof directed towards the work piece being machined.

Abstract: A rotary coolant adaptor (10) is disclosed comprising:(i) a rotatable shaft (4) having at one end a chuck (5) for receiving a tool and at the other end a connection (6) for engaging a machine tool spindle, the rotatable shaft having a bore (8) through which pressurized coolant can be supplied to the tool, one or more inlet(s) in fluid communication with the bore and circumferential grooves provided in the shaft to either side of the inlet(s);(ii) a fixed portion locating around the rotatable shaft, the fixed portion having an inlet through which pressurized coolant can be supplied to the inlet(s) in the rotatable shaft; and,(iii) sealing means (20) located in the circumferential grooves, the sealing means having first sealing faces (28) for sealing against the shaft and second sealing faces (26) for sealing against the fixed portion of the adaptor,wherein the pressure of the coolant flowing through the adaptor forces the sealing means (20) to seal against the rotatable shaft and the fixed portion of the adapt

Abstract: A coolant delivery method and apparatus comprising a high and low pressure pump for providing high and low pressure coolant flow through a common conduit to a coolant orifice of a cutting tool of a machine tool or a nozzle of a workpiece flushing station. The high pressure pump has a cylinder with a reciprocable piston operably coupled to a drive for moving the piston to discharge coolant under high pressure to the cutting tool while a workpiece is machined by the tool. A one-way flow valve in the conduit permits coolant flow from the low pressure pump to reach the cutting tool as well as the high pressure pump cylinder to recharge the cylinder with coolant while the high pressure pump is not discharging coolant. Cutting tool failure as well as an orifice obstruction is detected by monitoring coolant flow from the high pressure pump during each machining cycle of machine tool operation.

Abstract: A method for producing discontinuous chips during the machining of a work piece by a cutting tool is provided. The method includes the steps of engaging the cutting tool into the workpiece to produce a continuous chip and directing a stream of cryogen toward the continuous chip, so as to rapidly cool the continuous chip and fracture the continuous chip into the discontinuous chips.

Abstract: A drill has a drive unit having a front end and an output shaft projecting from the front end and centered on and rotatable about an axis, and a fan associated with the shaft for creating a moving stream of air traversing a location at the drive-unit front end. A chuck body fixed on the shaft is formed with a rear end juxtaposed with the drive-unit front end, an axially forwardly open tool recess on the axis, a plurality of angularly spaced and angled guides opening into the recess, and at least one passage extending between the chuck rear end and the recess. Respective jaws displaceable in the guides have front ends in the recess. An adjustment sleeve is rotatable about the axis on the body and interengaging formations on the sleeve and on the jaws displace the jaws radially on rotation of the sleeve about the axis.

Abstract: A clamping device includes a housing, removably connected to a drill motor, which has a first end portion adapted to be received within an aperture defined in a drill plate. The first end portion of the housing also defines a number of openings in which respective ones of a plurality of ball bearings are disposed. The clamping device also includes means for forcing each ball bearing outwardly within a respective opening defined in the first end portion of the housing such that portions of the ball bearings are extended outwardly beyond the housing and are urged against the drill plate. Thus, the drill motor can be securely clamped to the drill plate. The clamping device can also include a mandrel defining an internal bore through which the cutting element extends. The mandrel typically has an exterior surface in which a plurality of recesses are defined. Each recess can be aligned with a respective opening defined in the housing and can be adapted to receive a respective ball bearing.

Abstract: The chuck is used with a drill drive unit having a spindle extending along and rotatable about an axis. The chuck has a chuck body fixed on the spindle and formed with an axially forwardly open tool recess on the axis, a plurality of angularly spaced and angled guide holes opening into the recess and having inner surfaces, and a respective grit-clearing passage opening at a respective front end into each of the guide holes axially rear-ward of the recess. Respective jaws displaceable in the guide holes have outer surfaces riding on the inner surfaces of the respective guide holes and have front ends in the recess. An adjustment sleeve is rotatable about the axis on the body and interengaging formations on the sleeve and on the jaws displace the jaws radially on rotation of the sleeve about the axis.

Abstract: A coolant pump supplies coolant flow to a part to be machined on a machine tool, and to a cutting tool holding device. In one embodiment the tool holder is part of a self compensating tool holding device which allows the cutting tool to float in position until the coolant supply forces a piston against a collet which grasp the tool holder in a fixed position. In a second embodiment, the tool holder is part of a device to cause linear motion of the cutting tool by using the coolant flow to force the piston shaped tool holder, and cutting tool thereon, through a cylindrical bore in a main body, and extend outward from the main body. In yet another embodiment, the tool holder is mounted to a hydraulic motor which uses the coolant flow to rotate the tool holder and cutting tool thereon.

Abstract: A drilling apparatus for penetrating material includes an elongated rotary tool for boring an aperture in a workpiece by turning about a longitudinal axis and for moving along the longitudinal axis relative to the workpiece during a cutting operation. The tool also includes a cutting head mounted on an end of an elongated, hollow shaft. A fluid circulation system brings a flowable substance temporarily into engagement with the workpiece during the cutting operation. The circulation system forces the flowable substance to flow in a passage defined by an external surface of the shaft and the workpiece toward the cutting head along an entire longitudinal length of the aperture being drilled. The flowable substance exits the aperture through the hollow shaft after flushing material from the cutting head.

Abstract: A machine tool having a frame, a turret on the frame having a spindle for holding an operating tool, structure on at least one of the frame and turret for operating the spindle to effect machining of a workpiece by an operating tool held by the spindle, and first structure on at least one of the frame and turret for communicating fluid in a flow path from a pressurized supply to a workpiece to be machined by an operating tool held by the spindle to effect deburring/washing of the workpiece.

Abstract: An attachment for a hand tool for converting rotary motion to reciprocating motion to an air bathed tool holding chuck.

Abstract: A machine tool comprises a spindle head (2) having a vertical bore (2a); a spindle (20) provided in said vertical bore (2a) and including a tapered hole (24) at the lower end of said spindle (20); bearing means (22a) provided in said vertical bore (2a) for rotatably supporting said spindle (20); a non-contact sealing means (10a) for sealing the bearing means (22a). The machine tool further comprises a device for preventing a cutting fluid from entering the bearing for the spindle. The device comprises means (6a, 6b) for forming a pressure chamber (6) provided so as to enclose the non-contact sealing means (10a); and means (44) for supplying air to the pressure chamber (6).

Abstract: A device utilizing positive and negative fluid pressure and the plurality of tandem operating components for securely clamping a drill motor to a drill plate in order to drill precisely positioned holes in a workpiece includes an annular mandrel and annular collet concentrically disposed about the cutting tool. A first end of the collet includes a plurality of longitudinally extending fingers while the mandrel has a tapered end portion having a larger external diameter than the center cylindrical portion of the mandrel. A plurality of pistons are also coaxially disposed about the cutting tool and within piston subchambers defined within the piston housing of the clamping device to extend and retract the mandrel and the collet. Once extended, the longitudinally extending fingers of the collet overlie the center cylindrical portion of the mandrel. Thus, the clamping device may be inserted through an aperture defined in a drill plate.

Abstract: A method of drilling a through-hole for inter-surface conduction in a laminate for a printed wiring board, in which the heat generation in a drill bit can be inhibited in drilling holes, quality holes can be highly efficiently made in the presence, on the laminate surface, of a novel water-soluble lubricant sheet which has high strength and can be handled easily, the method comprising drilling the through-holes in the presence of a water-soluble lubricant sheet which has a thickness of 0.02 to 3 mm and is formed from a mixture of 20 to 90% by weight of a polyether ester with 10 to 80% by weight of a water-soluble lubricant.

Abstract: A method of treating a substrate for an electrophotographic photosensitive member by a process comprises the steps;a) cutting the surface of the substrate to remove the surface in the desired thickness; andb) bringing the cut surface of the substrate into contact with water having a temperature of from 5.degree. C. to 90.degree. C., having a resistivity of not less than 11 M.OMEGA..multidot.cm at 25.degree. C., containing fine particles with a particle diameter of not smaller than 0.2 .mu.m in a quantity of not more than 10,000 particles per milliliter, containing microorganisms in a total viable cell count of not more than 100 per milliliter and containing an organic matter in a quantity of not more than 10 mg per liter, for at least 10 seconds at a pressure of from 1 kg.multidot.f/cm.sup.2 to 300 kg.multidot.f/cm.sup.2.

Abstract: A method and apparatus for producing deep drill holes, particularly in wood and similarly structured materials, in which two drill elements, embodied as hollow shafts with cutting ends formed as cutting elements and concentrically disposed one within the other, are operated at different speeds, the cutting end of the interior drill element running behind the cutting end of the exterior drill element.

Abstract: A machine has a cutter for performing a cutting operation on a series of workpieces. The cutter is moved toward the workpiece to perform the cutting operation, and a control regulates the amount of such movement to an infeed distance for effecting a predetermined depth of cut. The control is adjusted in response to temperature changes which result in machine growth/shrinkage in order to vary the infeed distance as required to maintain the depth of cut constant despite the machine growth/shrinkage.

Abstract: An annular front end base portion, a main portion and an annular rear end base portion form all together a substantial portion of a collet provided with a tapered outside surface adaptable closely in a tapered hole of a collet chuck and a tool holding hole is formed in the axial portion of the collet. In the main portion are formed a first set of axially long radial slits opening at the end surface of the front end base portion and terminating to be closing in the rear end base portion and a second set of axially long radial silts opening at the end surface of the rear end base portion and terminating to be closing in the front base portion. Each of the radial slits of the first set and each of the radial slits of the second set are arranged at proper angular intervals and alternately along the peripheral direction of the collet, and respective zigzag paths are formed which are closed over the whole peripheries of the outside and inside surfaces of the collet, respectively.

Abstract: A device for securely clamping a drill motor to a drill plate in order to drill precisely positioned holes in a workpiece includes an annular mandrel and annular collet concentrically disposed about the cutting element. A first end of the collet includes a plurality of longitudinally extending fingers while the mandrel has a tapered end portion having a larger external diameter than the center cylindrical portion of the mandrel. A pneumatically-actuated piston is also coaxially disposed about the cutting element to extend and retract the mandrel and the collet. Once extended, the longitudinally extending fingers of the collet overlie the center cylindrical portion of the mandrel. Thus, the clamping device may be inserted through an aperture defined in a drill plate. Following its retraction, the longitudinally extending fingers of the collet overlie the tapered end of the mandrel and are correspondingly expanded.

Abstract: A diamond core drill using a sealed core bit is fastened centrally by means of a hollow shaft with a slanted cut at one end, that is used in a wedging manner to secure the tool against the work surface. This eliminates the need for an exterior frame and thus permits the use of large hole saws up to 48", held by a simple and economical tool. The tool feed towards the surface is controled via an advance control nut that screws on the filleted part of the shaft. The tool has a water feed system that entraps the water in a chamber formed by the barrel of the saw and the surface to be cut, that forces the water to seep along the sawing gap thus facilitating lubrification of the core bit. The resulting configuration is such as to allow for a single tool operator.

Abstract: A cooling and dust collecting apparatus for drilling machine tool is disclosed, which comprises a telescopically expandable/shrinkable cylinder having a base cylinder and a movable cylinder, the base cylinder being disposed on the drilling machine in such a manner that the base cylinder surrounds the drilling machine, the movable cylinder being slidably connected to the base cylinder, the movable cylinder surrounding a cutting tool, a blowing pipe connected to an outlet opening portion defined on the movable cylinder, the blowing pipe being adapted for blowing the cutter with cold air, and a sucking pipe connected to an inlet opening portion defined on the movable cylinder, the sucking pipe being adapted for sucking cutting chips and poisonous gas, wherein the movable cylinder has a joint portion, a forward end portion, and an intermediate portion, the joint portion being connected to the base cylinder, the forward end portion surrounding the drill of the drilling machine, the intermediate portion being dispo

Abstract: An interface 1 between a tool carrier 5 and a clamping shaft 3 of a machine tool holding the tool carrier is proposed comprising a hollow fitting pivot 7 which is provided at the tool carrier and is provided with a first clamping surface 19 on its inner wall, comprising a recess 9 provided at the front wall 73 of the clamping shaft for receiving the fitting pivot, a clamping member 37 is arranged in this recess 9 and is axially displaceable inside the clamping pivot, the clamping member 37 is provided on its outer side with a second clamping surface 71 cooperating with the first clamping surface via clamping elements 69 which are arranged on the outside of the clamping member, can be swiveled out radially by the clamping member against a resilient restoring force, and can be made to engage with the first and second clamping surfaces, characterized in that the clamping elements 69 are arranged at the circumference of the clamping member constructed as clamping pin 37 so as to be freely movable in the axial dir