Abstract: In a cutting oil supplying device supplying cutting oil to a tap which taps a work installed on a worktable, the device comprises a cup being filled with the cutting oil provided beneath the worktable and located at a tapping position, and a wiping means provided in the cup such that when the tap goes into and out of the cup, the wiping means wipes off excess oil and cutting dust and applies the least amount of the cutting oil necessary for cooling the tap and reducing friction between the tap and the work to the tap, where the wiping means is a flexible porous member such as a sponge for example.

Abstract: A cooling and dust collecting apparatus for machine tool for cooling a cutter mounted on a rotating spindle and for sucking and exhausting cutting chips to the outside of the apparatus is disclosed, which comprises a cooling and dust collecting housing surrounding the rotating spindle and the cutter, a plurality of cold air passages, defined inside the housing, for sending cold air of a pressurized cold air supply portion disposed as an external device to a first cold air delivery hole and a plurality of second cold air delivery holes, a cutting chip exhaust passage, defined in the housing, for connecting a cutting chip sucking device disposed as an external device to an inner space of the housing, and an elastic hood downwardly extending from the lower end of the housing, the elastic hood defining slits at the lower end thereof, wherein the first cold air delivery holes are adapted to blow pressurized cold air toward a shaft portion of the cutter, and wherein the second cold air delivery holes are adapted to

Abstract: A pilot drill bit includes a shank, with an abutment flange mounted fixedly to the shank, and coaxially aligned relative to the shank and the abutment flange are a plurality of drill sections of decreasing diameter terminating in a tip, with the sections arranged and sized for drill taps.

Abstract: A tool holder for use in a machine tool spindle comprising a shank portion, a tool mounting portion and a circular flange portion. Disposed in the distal end of the mounting portion is a central aperture while disposed in the distal end of the shank portion is a threaded aperture which communicates with the central aperture. The tool holder further comprises a cylindrical sleeve member which is slidably receivable into the central aperture when a heat source is applied to the mounting portion and rigidly maintained within the central aperture via thermal contraction when the mounting portion is cooled. A tool mounting aperture extends axially through the sleeve member which is in fluid communication with the threaded aperture. The shank portion of a cutting tool is slidably receivable into the mounting aperture when a heat source is applied to the sleeve member and rigidly maintained within the mounting aperture via thermal contraction when the sleeve member is cooled.

Abstract: An apparatus for effecting penetration and mass transfer at a penetrable situs, comprising: (a) a penetration member constructed and arranged for movement between (i) a first position disengaged from the penetrable situs, and (ii) a second position engaged with the penetrable situs to form a penetration opening in the penetrable situs communicating with an interior region thereof; (b) a motive driver for selectively moving the penetration member between the first position and second position; and (c) a mass transfer assembly (i) selectively engageable with the penetration opening in the penetrable situs, after formation thereof by the penetration member in the second position and subsequent movement of the penetration member by the motive driver to the first position, and (ii) constructed and arranged to effect mass transfer through the penetration opening between the interior region of the penetrable situs and a locus exterior to the penetrable situs, when the mass transfer assembly is engaged with the penet

Abstract: A tool member includes a ratchet head having a central polygonal aperture arranged to selectively receive a die holder member or alternatively, a collet assembly for mounting a threading tap. A second handle member is arranged for selective securement to the head in longitudinal alignment relative to a first handle mounted to the ratcheting head, wherein the first and second handles are arranged on opposed sides of the mounting head orthogonally oriented relative to the head's axis.

Abstract: In machining a substrate surface of a photoreceptor by the use of a cutting machine which supplies cutting lubricant from a reservoir to a cutting tool of the cutting machine, the method comprises a measurement of a cutting tool temperature by a sensor and a control of both the temperature of cutting lubricant and a flow rate thereof. The control is responsive to the cutting tool temperature and suppresses a temperature fluctuation of the cutting tool.

Abstract: A tapping attachment for driving a tapping spindle constructed to be adapted for both direct drive and reverse drive of the spindle. The drive of the spindle is by way of a resiliently mounted dog ring having rigid radially extending drive dogs, extending radially outwardly and inwardly from a drive ring. The driving dogs are rigid, having slanting sides to accommodate clutching engagement and disengagement. Clutching engagement and disengagement occur as a result of relative axial movement as between the attachment and the drive spindle. The drive spindle has a central bore in which is provided an insert member having an axial bore which is connected to a flexible tube within the bore of the spindle, which accommodates relative axial movement, the flexible tube communicating with a similar bore in a tap itself. These bores provide a channel for continuously supplying coolant to the machine and to the spindle itself.

Abstract: A coolant supply system for a machine tool comprises a coolant source; a nozzle for directing coolant to inside of a workpiece from the coolant source; another nozzle for directing coolant to outside of the workpiece from the coolant source; and a valve for automatically selectively directing coolant only to the inside of the workpiece, thereby increasing coolant flow to the inside of the workpiece when needed.

Abstract: A drilling tool, such as, a drill bit or a reamer, including at least two helical flutes about the axis of said tool. The tool is remarkable in that it includes an axial channel opening out at a fixed end of the tool designed to be received in rotary drive means therefor, and a plurality of ducts connecting the axial channel to the bottom of each flute. Each duct opens out into the corresponding flute via an orifice and is inclined towards the free end of the tool, opposite to the fixed end thereof.

Abstract: A hollow column is provided for a tool turret with a housing that is to be connected to a machine tool or the like, with a drive motor, and with a tool disc which has receptacles for tools, the tool disc being mounted rotatably relative to the housing and being lockable in selectable angular positions. The hollow column is nonmoveable relative to the housing. A shaft which extends in the longitudinal direction of the column, and which can be driven by the drive motor is disposed within the hollow column. That tool, which is inserted into the receptacle that is situated in the working position, can be driven by the shaft. At least one line is provided in the column so as to be part of a system provided for the transfer of energy, lubricant, coolant, pressure or the like.

Abstract: A rotary feed system for a machine tool capable of feeding, for example, an off-center or a centrally-supplied tool with a coolant, has at the downstream end of a shaft delivering a fluid medium, a rotary distributing valve which is actuated by a fluid, e.g. compressed air applied to one or two vanes of the rotary piston within a generally annular or segmental working compartment.

Abstract: A tool holder assembly, having a central tool holding shaft (1) provided, on the one hand, with a mounting cone for securement in a machine tool spindle and, on the other hand, on the side opposite the cone, with an intermediate cylindrical body provided at its forward portion with securement structure for a tool. It is provided also with a feeler device (2) centered on the central shaft (1) and guided in translation on this latter, with lubricating structure and with cleaning structure for the machining region at the location of application of the feeler device (2).

Abstract: An electric hammer drill including a vacuum dust collecting device for collecting dust from an area of an article being drilled by a drill bit wherein a hose extending from a body of the hammer drill is directly connected to an end of a movable first pipe which is slidably received in a stationary second pipe. A fan for transporting the dust by vacuum is fixed on a shaft extending across a dust collecting chamber in the body. The shaft is coaxial with, and releasably coupled with, an armature shaft of a motor. With this releasable coupling, the armature shaft is relatively short and unlikely to bend or flex, so that vibration produced during a drilling operation is small. During the drilling operation, the first pipe slides back and forth along the second pipe as a suction hood moves in a direction opposite to the direction of movement of the drill bit.

Abstract: A single-blade reamer (30) is disclosed with a cutter plate having a cutter blade (5) and attached to the base body (20), and with two guide strips (6, 7) disposed at the circumference of the base body. A chip-guide device (8, 9, 10, 11) is disposed between the cutter plate or, respectively, the cutter blade (5), and the first guide strip (6) following at an angular distance relative to the cutter (5) as seen from a point of a fixed external coordinate system when the reamer (30) is rotating in a proper cutting direction and/or between the first guide strip (6) and a second guide strip (7), disposed opposite to the cutter blade (5).

Abstract: A chip flushing apparatus for connection to a machine tool for flushing chips of debris from cutting operations performed by the machine tool. The flushing apparatus includes a header bar having outlet means for dispensing fluid to a chip receiving area of the machine tool for transporting the chips to a recovery box. A fluid flow deflector is positioned near the outlets of the header to deflect the fluid streams into a laminar flow across the fluid receiving area. A removable tank is mounted below the receiving area to receive the flushing fluid. The tank is wheeled for convenient transport.

Abstract: Apparatus for the diamond machining of materials which detrimentally react with diamond cutting tools in which the cutting tool and the workpiece are chilled to very low temperatures. This chilling halts or retards the chemical reaction between the workpiece and the diamond cutting tool so that wear rates of the diamond tool on previously detrimental materials are comparable with the diamond turning of materials which do not react with diamond.

Abstract: An improved spindle assembly for a single or a multiple spindle machine is disclosed. An outer tubular member is mounted for rotation by the spindle machine. An inner shaft is positioned within the tubular member and a collet is movable between a locked and an unlocked position. A workpiece can be removed from the unlocked collet by high pressure liquid from the inner shaft. In one embodiment the inner shaft is rotated independently from the tubular member and is also axially reciprocable. A tool mounted on the inner shaft provides for interior machining at the same time as an exterior operation is being performed. In another embodiment the collet remains axially stationary.

Abstract: A high speed machining system (10) including a machine tool (16) mounted on a hollow shaft (14) rotatable at high speeds and the tool (16) being operable at high feed rates. Liquid cutting coolant (22) flows to the tool (16) through the hollow shaft (14) to flush away debris from the tool (16) and for cooling the system (10). Drive means (18) including windings rotate the shaft (14), which is supported by bearings. The windings and bearings have the characteristic of long life in an environment free of liquid cutting coolant (22). The high speed machining system (10) includes a seal assembly (30) to prevent the liquid (22) from entering the liquid-free environment of the bearings and the windings. The seal assembly (30) includes annular means for urging (52) a stationary sealing face (42) against and in annular contact with a rotating hardened sealing surface (38) to form an annular primary seal (54) for isolating the liquid (22 ) from the bearings and windings.

Abstract: A device for forming an undercut in a drill hole includes a drilling tool having a shank receivable in a chuck of a drilling machine and having a convex collar supported on a corresponding concave bearing surface of a bearing element of the device. The bearing element has a bore that communicates the bearing surface with an opening which communicates with a source of a lubricant liquid. The collar has at least one groove for conducting the liquid into the drill hole to the drill bit head of the tool.

Abstract: A rotary tool holder of the type including a stationary shell adapted to be reciprocally positioned within a bushing plate and a shaft mounted rotatably within the stationary shell. An annular space is provided between the shaft and the shell and the shell includes an enlarged diameter collar portion proximate one end of the shell and a reduced diameter pilot portion extending from the collar portion to the other end of the shell. The pilot portion is slidably received in the bushing plate and the collar portion receives a pressurized coolant fitting. Needle bearings are provided in the annular space between the shell and the shaft proximate the pilot portion and a pair of annular seals are provided in the annular space between the shell and the shaft proximate the collar portion. The annular seals are positioned on opposite sides of a radial passage formed through the collar portion and through the shaft for communication with a central axial bore in the shaft.

Abstract: A boring apparatus wherein the size in the axial direction of the shaft of the manual handle horizontally supported can be made small-sized. A clutch is composed of spherical bodies, a cylindrical body having formed therein hole portions for receiving the spherical bodies, spherical body pressing means for pressing the spherical bodies to the outside or inside of the cylindrical body, and an engagement member having recessed portions engaging with the spherical bodies which are projected to the outside or inside of the cylindrical body, and the boring apparatus is constructed by using the clutch.

Abstract: There is provided by this invention a chip extraction apparatus for extracting chip swarf from a workpiece for collection in an external vacuum source. The chip extraction apparatus is comprised of a nosepiece assembly which houses a spring/atmospheric pressure actuated piston for providing telescopic capabilities to a drill bushing. The drill bushing contains an air inlet port for allowing air to be drawn into the interior fo the drill bushing where it will mix with chip swarf. The air application assists chip flow and contributes to efficient vacuum withdrawal of chip swarf from the drill flutes into the vaccum chamber of the nosepiece assembly. The chip swarf is eventually expelled through a vacuum port in the nosepiece assembly to the external vacuum source. Alternative drill bushing configurations are disclosed to provide consistent chip extraction rates for different material requirements and cutting tool types.

Abstract: The herein-proposed device includes a housing (1) provided with a hole (2) adapted to receive an arbor (3) carrying a cutting tool (4), a seal (8) mounted on the housing (1) in the zone of interaction between the cutting tool (4) and a workpiece (6) to be machined, pipings (16, 18) adapted for the supply and withdrawal of coolant, respectively, and a chip disposal opening (10). The device is provided with a safety valve (19) installed on the coolant supply piping (18). The housing (1) is provided with a seal (5) arranged in the zone of location of the arbor (3). The chip disposal opening (10) and a space (9) of the housing (1) are arranged on the opposite sides with respect to an end face (11) of the housing (1) in the zone of interaction between the cutting tool (4) and the workpiece (6) to be machined.

Abstract: A pressure foot for a machine for drilling a printed circuit board is supported to be slidable in an axial direction of a rotor shaft and is connected to a vacuum suction source. The pressure foot is adapted to depress the printed circuit board during a drilling operation. A first air pathway is formed from a first supply port formed in a side wall of the pressure foot to a plurality of first blow-out ports formed in a contact surface of the pressure foot with the printed circuit board. The first supply port is connected with a pressure air source. A second air pathway extends from a second supply port formed in the side wall to a plurality of second blow-out ports opened toward an interior of the pressure foot. The second air pathway is in communication with a supply source of a pressure air. Thus, the working time and cost are reduced.

Abstract: High pressure gas cutting process useful for drilling large numbers of holes in large surface area workpieces such as air frame components and the like. The procedure utilizes a cutting tool which has an internal fluid passageway extending through the shank portion thereof and terminating in at least one discharge port adjacent a cutting edge of the tool. As the cutting tool is rotated and advanced into the workpiece in the course of the cutting operation, a high pressure gas is supplied into the cutting tool passageway under an applied pressure of at least 500 psia. The gas, which may be an inert gas such as nitrogen, is discharged from the cutting port into the tool with an expansive cooling effect. The gas then flows outwardly through the hole and exits the hole with sufficient velocity to entrain and remove the drill cuttings from the hole. A liquid lubricant can be employed to prolong the life of the cutting tool.

Abstract: A spindle mounted accessory holder block is fixed to extend across the nose of the tool machine at a spaced location from the main bore of the rotatable spindle in which the main operating device is positioned. The block has an outer face with a plurality of seats defined therein each being spaced at a specific radial distance from the main bore and each providing a mounting for a pin holder of an accessory mechanism. For this purpose the block is provided with two or more inwardly extending seats each having holes therein forming passages providing the connection for a medium associated with the accessory, for example, compressed air or similar fluid. The holes in the seats of the block provide means for mounting a pin or pipe connection for the accessory which may be positioned at a spaced radial location from the main operating mechanism by mounting it in a selective hole of the block.

Abstract: A dust collecting assembly for use with a machine tool having a rotating tool bit, which includes means for applying a plurality of parallel jets of air in the direction of particles as they are removed from a workpiece by the tooling operation. The jets of air are directed to slow down the particles so that they may be removed by a vacuum exhaust system. In applying the method to multi-directional tooling operations a plurality of jets surround the entire work area and selected subgroups of the jets are activated which oppose the trajectory of removed particles as the direction of the tooling operation changes.

Abstract: A fast tool change holder is provided for holding a tool adapter onto an internally delivered coolant spindle. The holder comprises an expandable split collet which can be inserted into the tool adapter and expanded in order to hold the adapter onto the spindle. The split collet has an expandable bladder therein which receives a coolant fluid from the spindle and expands under the pressure of the coolant fluid radially outwardly for expanding the split collet. The bladder enables the coolant fluid to assist mechanical and centrifugal forces associated with the split collet to hold the tool adapter onto the spindle.

Abstract: An apparatus for assisting a podiatrist in the performance of various para-medical operations on patients. The apparatus consists of a unit movble on the ground as if a dental unit used by dentists. The work unit includes a pneumatic network, connected to an external air compressor, and to which is connected three tools. Two of these tools include drilling heads, pressurized water outlets and pressurized air outlets, while the third tool includes a pressurized water outlet and pressurized air outlet. Operation of each tool, and of each outlet and drill of a given tool, is made independently of each other, and controlled by a number of knobs, buttons and dials.

Abstract: The invention relates to a tool-spindle arrangement comprising a main spindle rotatably supported in a spindle housing and an electrical drive motor drivingly connected to the main spindle. The main spindle is constructed hollow to receive operating elements of the spindle arrangement. It is suggested that the motor shaft of the electrical drive motor itself is constructed as a main spindle.The main spindle is part of the drive motor. It is preferably constructed in two parts, namely, a spindle section and a motor-shaft section which, when connecting the drive motor to the machine, are coupled with one another. The motor-shaft section is also constructed hollow to receive operating elements, for example clamping members for chucking of the tool, air-blast pipes, cooling-medium pipes, etc.

Abstract: A tool holder system for stationary or rotatable tool holders in machine tools with manual or automatic tool change, has a tool holder provided with a mechanism for locking the tool head onto clamping surfaces, and integrated liquid coolant supply and a compressed air supply to the clamping surfaces. At the clamping end of the tool holder, a checkvalve is provided in the air supply passage to block incursion of liquid coolant even at high pressures of the latter and thus prevent corrosion and damage which may result from such corrosion.

Abstract: An apparatus securable onto a machine for tooling stationary parts, which provides a lubrication/coolant delivery system externally mountable upon a tool holder, of the type having a rotatable die head with a plurality of dies for machining the stationary part.

Abstract: A tool holder (32) includes a rotary portion (36) securable in a spindle (20) of a machining center (10). A pumped flow of primary coolant (16) is delivered through spindle (20) and rotary portion (36). A pumped flow of secondary coolant (22) is delivered to a static connection (26) and through the static portion (34) of the tool holder. A tool guard assembly (42) secured to static portion (34) surrounds an installed superabrasive grinding wheel (66). It also includes flow paths (50, 52, 98; 62, 68, 82 84) and nozzles (70, 80, 86, 94) to direct coolant to pre-established directions. The tool may be installed automatically in a multipurpose machining center with no additional set up time required.

Abstract: The drive means (3) is arranged directly on the tool (2) and can be moved together therewith about a plurality of axes (A, B, C and D). The drive means is provided with a tool holding means for automatically delivering or receiving tools in a tool magazine (5) which is arranged above the region of operation of the tool (2). In that way a plurality of tools can be operated with a single drive means, wherein the tool guidance, workpiece forward feed and interchange of tools can be fully automated and programmed.

Abstract: In a pressure foot used in an apparatus for drilling printed circuit boards, which includes a bearing for holding a spindle, and formed at the end portion thereof with an inner void space having a bottom hole for passing the drill bit, the end portion of the pressure foot is provided with an annular end surface possibly contacting with the printed circuit board and air injection ports for injecting compressed air into the inner space. The air injection ports are so directed that the air flow from each injection port is tangently contacts with the circumferential surface of the drill.

Abstract: The operating mechanism of a tool retention and ejection mechanism for the spindle of a machine tool is located in an annular space between the spindle and the grill. A drawbar is slidably disposed in an axial bore formed in the spindle and is provided with a collet at the cutter end of the spindle for engaging a tool holder and drawing it into the socket of the spindle. The drawbar is shifted into its locking position by an annular array of balls that are forced against a bevel surface by a cam ring that is moved to a locking position by a spring. The bevel surface is formed on a ring that encircles the spindle and which is coupled to the drawbar by a crossbar that extends radially through the spindle. In order to increase the power available for releasing the mechanism, two annular pistons are provided in an annular cylinder disposed in the space between the spindle and the quill.

Abstract: The drive means (3) is arranged directly on the tool (2) and can be moved together therewith about a plurality of axes (A, B, C and D). The drive means is provided with a tool holding means for automatically delivering or receiving tools in a tool magazine (5) which is arranged above the region of operation of the tool (2). In that way a plurality of tools can be operated with a single drive means, wherein the tool guidance, workpiece forward feed and interchange of tools can be fully automated and programmed.

Abstract: A fluid inducer for mounting to an oil-hole drill sleeve includes at least two removable sections for easy replacement of internal O-rings without the need for removal of the drill sleeve or drill bit from the drilling machine. The inducer includes a cylindrical main inducer body having an inner bore around which are horizontally disposed at least two space O-rings that define an annular space about a lower position of the drill sleeve. A cylindrical bearing body is removably connected to the inducer body and includes an inner bore for retaining at least one annular bearing assembly that is mounted to the drill sleeve.

Abstract: The invention concerns a nose piece adaptor for a manual or power feed drill. The adaptor has a hollow cylindrical sleeve (11) surrounding the drill bit and having on the outer surface of one end thereof a taper lock (13) for engagement with location studs (17) in a template (16). At its other end the sleeve (11) can be threadedly engaged or integral with the drill. The sleeve (11) has a sprung, quick-release ball (25) lock mechanism for engaging with or disengaging from a peripheral locking groove (26) of a nose piece (14) inserted into the bore of the sleeve (11). The nose piece (14) is a simple cylindrical rod with a bore (30) for the drill bit.

Abstract: A machining system includes at least one machine tool (10) having at least one powered spindle (12) and a plurality of tools (14A-14F) stored in a magazine (40) for automatic retrieval and return by the spindle (12). A portable fixture assembly (16A, 16B, 16C) is employed in conjunction with the machine tool (10) and the tool magazine (40) for holding a workpiece (WP) during machining by the machine tool (10). The fixture assembly (16A, 16B, 16C) includes a plurality of clamping cylinders (70, 72, 80) and a plurality of clamping assemblies (84, 86) which are actuated either by the rotational torque supplied by spindle (12) or by the coolant fluid obtained from the spindle (12).

Abstract: Method and apparatus for conducting boring of a series of spaced walls on a workpiece using a self-adjusting boring bar.

Abstract: An improved coolant manifold assembly is provided for supplying liquid coolant to the working surface of a cutting or grinding wheel in the course of a machine tool cutting or grinding operation. The coolant manifold assembly is adjustably mounted by a support frame onto a machine housing and includes a manifold unit having a coolant discharge nozzle disposed in relatively close association with a rotatable cutting wheel or wheels or the like. The manifold unit is supported from the frame by a first slide member which is adjustable to select the position of the discharge nozzle relative to the cutting wheel. In addition, the manifold unit supports an absorbent pad wetted with coolant and protruding into direct contact with the cutting wheel at a position generally adjacent the coolant discharge nozzle. A second slide member carries the absorbent pad for adjustment of pad position relative to the coolant discharge nozzle.

Abstract: A method of lubricating a metal working machine which has (i) at least one sliding machine surface requiring lubication and (ii) a metal working section wherein metal is worked in contact with a metal working fluid, said method comprises applying a lubricating oil composition to said at least one sliding surface and using as said metal working fluid an aqueous working fluid composition comprising said lubricating oil composition diluted with water, said lubricating composition comprising;(A) 5 to 88% by weight of at least one oil selected from the group consisting of a mineral oil and a synthetic oil,(B) 2 to 50% by weight of a reaction product of a long chain dibasic acid having 14 to 28 carbon atoms and an alkanolamine,(C) 5 to 30% by weight of at least one extreme pressure additive selected from the group consisting of sulfurized fat and oil, a phosphate, a phosphite, and an amine salt of phosphate or phosphite(D) 5 to 30% by weight of an emulsifying agent selected from the group consisting of an anionic s

Abstract: This invention relates to a machining center fluid delivery system comprising a body block to be mounted on a tool holder to be installed in a machining center and a driving source block to be mounted on the machining center, and to a machining center equipped with such a fluid delivery system. The invention assures an exact orientation of nozzles and their delivery of a machining fluid towards the machining point which is constantly shifted with the progress of machining operation, thus contributing to an extremely high performance of cutting and grinding operations.

Abstract: A holder for a cutting tool has a main spindle formed with a bore to receive the cutting tool, a casing mounted on the main spindle, and an oil receiver stand secured to the casing. The main spindle, casing and receiver stand are each formed with an oil passage communicating with one another to feed cutting fluid to the cutting tool. The holder is characterized in that an intensifier for increasing the feed pressure of the cutting fluid is provided in an annular chamber provided around the main spindle in the oil passage to the cutting tool.

Abstract: As an alternative to the drilling of relatively long holes through a mass of material to provide a passage for fluid coolant the invention makes use of a laterally open elongated slot cut into the mass of material into which easily worked material is embedded to form the fluid passage. One alternative is to lay a preformed length of tube in the slot and secure the tube in place with an appropriate bedding mass. Another is to make use of a molding expedient, namely, packing the passage with a moldable material in which an elongated core is embedded and then removing the core to form the fluid passage.

Abstract: The invention provides work piece support apparatus for supporting resilient sheet material during a machining operation, e.g., routing, in which the support apparatus includes hydrostatic clamping means comprising perforated support pads positioned each side of the resilient material and connected to a fluid supply. By this arrangement a fluid layer under relatively high pressure is interposed between each pad and the adjacent region of sheet material which is thus fluid pressure supported in the immediate vicinity of the routing tool throughout the machining process. The invention beneficially provides a routing machine including the work piece support apparatus in which the work piece is positioned in a generally vertical plane and the routing tool is mounted about a generally horizontal axis.

Abstract: Thru-holes are drilled in a printed circuit board panel having alternating dielectric layers and electrically conductive layers. A water soluble dry film lubricant sheet is placed adjacent an electrically conductive outer layer of the panel prior to drilling thru-holes through the panel with a rotary drill. The drill surface is lubricated while forming a clean thru-hole from contact between the drill and the lubricant. The dry film lubricant generally may comprise a water soluble lubricant hardened to a solid or semi-solid dry film-form and impregnated in a carrier such as a porous paper sheet. In one embodiment, the dry film lubricant includes a water soluble lubricant such as dipropylene glycol, a non-ionic surfactant, and a wax-like hardener. Following drilling of the thru-holes, the dry film lubricant sheet is removed, and the thru-holes can be rinsed in an aqueous alkaline solution.

Abstract: A method and tool (12) for use in an automatic machining center for removing drilling coolant from a blind hole (14) and for injecting tapping fluid into the hole (14), the tool having a nozzle (24) for removing the coolant from the hole and for injecting tapping fluid into the hole.