Abstract: A hand tool apparatus uses a cutting tool with a first width and a tool axis to machine a hole in an object. The hole has a second width at least as large as the first width of the cutting tool. The apparatus includes a housing, a spindle unit in the housing for rotating the cutting tool and an orbital drive for rotating the spindle unit. An axial feed mechanism moves the orbital drive and the spindle unit jointly either toward or away from the object being machined.

Abstract: A method of drilling and a drill motor are provided for use with a stationary template attached to a material to be drilled. The drill motor has a frame having a handgrip and surrounding a movable carriage or motor assembly. The motor assembly contains an air-powered motor for rotating a drill bit. At least two air cylinders are located in the motor assembly on opposite sides of the drilling axis and are used to move the motor assembly within the frame. The force that can be applied to move the motor assembly is adjusted by adjusting the airflow to the cylinders. Hydraulic restrictions control the maximum speed at which the motor assembly moves. An auto-return valve and adjustable pin provide means for automatically returning the motor assembly to its rearward position once a desired drilling depth has been reached. Controls are provided at the grip for operating the feed system and manually retracting the motor assembly.

Abstract: The invention pertains to a machine tool for processing workpieces with tools, wherein the machine tool has a spindle housing that contains a spindle shaft and accommodates at least one tool as well as a drive device that causes a rotational movement of the spindle shaft. The machine tool is characterized by the fact that the drive device (3) contains a hydraulically operated displacement machine or swash plate device.

Abstract: A method of drilling and a drill motor are provided for use with a stationary template attached to a material to be drilled. The drill motor has a frame having a handgrip and surrounding a movable carriage or motor assembly. The motor assembly contains an air-powered motor for rotating a drill bit. At least two air cylinders are located in the motor assembly on opposite sides of the drilling axis and are used to move the motor assembly within the frame. The force that can be applied to move the motor assembly is adjusted by adjusting the airflow to the cylinders. Hydraulic restrictions control the maximum speed at which the motor assembly moves. An auto-return valve and adjustable pin provide means for automatically returning the motor assembly to its rearward position once a desired drilling depth has been reached. Controls are provided at the grip for operating the feed system and manually retracting the motor assembly.

Abstract: A power feed attachment that has a coupling structure to couple it to a hand held drill. A double-acting cylinder, which has a piston and a rod, and is fixedly coupled to the coupling structure. A two-position valve assembly is configured for directing a pressurized fluid to the double-acting cylinder. When the two-position valve assembly is in a first position is directs a fluid to a first side of the piston moving the piston to a first position. When the two-position valve assembly is in the second position it directs the pressurized fluid to a second side of the piston to move the piston to a second position. An arm is coupled to the piston. A control mechanism having a housing and a control rod, wherein the control rod is movable within the housing of the control mechanism between an extended position and a retracted position.

Abstract: A method of drilling and a drill motor are provided for use with a stationary template attached to a material to be drilled. The drill motor has a frame having a handgrip and surrounding a movable carriage or motor assembly. The motor assembly contains an air-powered motor for rotating a drill bit. At least two air cylinders are located in the motor assembly on opposite sides of the drilling axis and are used to move the motor assembly within the frame. The force that can be applied to move the motor assembly is adjusted by adjusting the airflow to the cylinders. Hydraulic restrictions control the maximum speed at which the motor assembly moves. An auto-return valve and adjustable pin provide means for automatically returning the motor assembly to its rearward position once a desired drilling depth has been reached. Controls are provided at the grip for operating the feed system and manually retracting the motor assembly.

Abstract: A hand tool apparatus uses a cutting tool with a first width and a tool axis to machine a hole in an object. The hole has a second width at least as large as the first width of the cutting tool. The apparatus includes a housing, a spindle unit in the housing for rotating the cutting tool and an orbital drive for rotating the spindle unit. An axial feed mechanism moves the orbital drive and the spindle unit jointly either toward or away from the object being machined.

Abstract: A hand tool apparatus uses a cutting tool with a first width and a tool axis to machine a hole in an object. The hole has a second width at least as large as the first width of the cutting tool. The tool axis passes through a predetermined point on a surface of the object. The apparatus includes an actuating assembly including a housing. The housing contains an axial feed mechanism configured for moving the cutting tool in an axial direction, a spindle motor configured for rotating the cutting tool about the tool axis, and a radial offset mechanism. The radial offset mechanism is configured for moving the axial feed mechanism in a radial direction such that the tool axis is offset from a principal axis. A motor is configured for rotating said axial feed mechanism and the cutting tool about the principal axis.

Abstract: An axial feed apparatus having an adjustable feed stop is provided. The axial feed apparatus generally comprises a power feed module having an adjustable stop mechanism engaged therewith, wherein the adjustable stop mechanism may comprise a spindle threadedly engaging the power feed module. An adjustable depth-controlling device is further included intermediate the spindle and the power feed module, which uses a series of calibrated graduations in communication with the spindle such that a rotational change in the engagement of the graduations moves the spindle by a predetermined axial distance and thereby adjust the position of the feed stop for the power feed module. Such a power feed module may be combined with a drill motor to produce a device capable of drilling/countersinking holes in a workpiece.

Abstract: A compact autofeed drill is provided and generally comprises an elongate housing having opposed ends, a motor disposed within the housing, an elongate drill bit, a drill bushing, an actuation device, and a resilient member. The motor is disposed within the housing intermediate the opposed ends. The drill bit is operably connected to the motor and is capable of extending from the housing through one end thereof. The drill bushing is operably connected to the housing and defines a bore, where the drill bushing at least partially surrounds the drill bit as the drill bit extends from the housing through the bore. The actuation device is remotely disposed with respect to the housing and is operably connected thereto, wherein the actuation device is capable of causing the motor to rotate the drill bit and is also capable of causing the drill bit to extend from the housing.

Abstract: A positive feed tool having a retract valve. The retract valve is manually actuatable so as to cause an advancing spindle of the tool to retract away from a workpiece. The retract valve is configured to automatically return its unactuated position after the retract valve is manually actuated so as to cause the spindle to once again advance toward the workpiece.

Abstract: An apparatus for cutting a bore in a device includes a boring assembly having a cutting device coupled to a housing. A control system selectively floats the housing above a mounting surface, thereby allowing the housing and associated cutting device to be moved along the mounting surface to a selected position. The control system also selectively clamps the housing to the support surface and selectively tilts the housing to move the cutting device away from a wall of the bore cut by the cutting device.

Abstract: An automatic boring device is provided that comprises a tool housing having attached to it two opposing handles with switches mounted thereon for selective engagement of pneumatic controls that activate a clamping device, rotation of a chuck of a pneumatic drill, and downward movement of the drill. The pneumatic drill is removable and the depth of the downward boring stroke is adjustable.

Abstract: This invention is a portable pneumatic cutter tool for cutting countersinks into a workpiece 17 having pre-drilled holes 15. When pressure is applied, a piston return cylinder 57 and a feed rate cylinder 79 are also pressurized, which sets a body piston 72 and spindle piston 80 reacts against a spindle bar 82 which holds nose 94 in its outer-most limit position. A pistol grip drill 44 drives a geared belt 34 to cut the countersink after actuation by trigger 45. A flare tube shaft 14 expands a multiple finger and pad arrangement of a collet 12 to provide clamp-up on the back side of workpiece 17. Clamp-up on the front side of workpiece 17 is provided by pneumnatic pressure and solid mechanical stops 16. The countersink cutter 18 advances into workpiece 17, reaching its depth, and returns automatically to its start position.

Abstract: A system for operation of pneumatic tooling has a plurality of pneumatically operable tools (2). A servo-controller (21) is switchable to actuate any of the plurality of tools, to move that tool to a desired position. A position transducer (4) includes an element (9, 10) which is displaced from a home position by such actuation of any one of the tools. The position transducer sends a position feedback signal to indicate to the servo-controller when the desired tool position has been reached. The servo-controller is switchable by virtue of having its output connected to a number of valves (22), i.e. one valve per tool, where preferably only one valve is energized at a time. When a valve is at rest, the pneumatic circuit is such that the tool is held in its home position. When energized, the servo-controller outputs are routed to the tool to operate the tool.

Abstract: Automated drilling apparatus. This invention relates generally to an automated drilling apparatus, with its control system and other operating components uniquely integrated within an external housing, while operating via low pressure air sources or other fluid power sources commonly found in industrial settings, and methods for its use. The automated drilling apparatus could be adaptable to a wide range of hand-held or machine mounted automated drilling and machining operations because its unique integrated technology provides for a programmable lightweight small machine tool which will be effective in industrial settings. A prototype automated drilling apparatus has been effectively evaluated with test results proving the invention effective for industrial use.

Abstract: A hydraulically powered tool having a motor, a pump, and a hydraulic directional flow control valve. The valve has a frame and a rotatable spool with flow channels. The valve is provided as a four position, six way valve to provide four operational conditions for the tool including NEUTRAL, DRILL, RETRACT and FAST FORWARD.

Abstract: An apparatus and method are disclosed for controlling the rate of application of a machine tool to a work piece by compressing a lubricating agent, and then distributing the compressed lubricating agent to lubricate and cool a cutting point of the machine tool. A rod (15) translates axial forces from the machine tool (170) to compress a lubricating agent provided in a compression chamber (70). The pressurization of the lubricating agent creates a counter force to regulate the motion of the machine tool (170), and also forces a lubricating mist out of an exhaust opening (75) which can be directed by an air passage (80) to any point where lubrication is desired.

Abstract: A device for drilling a well bore is disclosed. The invention includes having a tubular string with a motor means for generating a rotative force. The device further includes an inner drilling device adapted to the motor means and an outer drilling device concentrically arranged about the inner drilling device. The device still further includes a planetary gear system adapted for imparting the rotation generated from the motor means to the outer drilling device. In one embodiment, the motor member has a shaft extending therefrom, with the shaft being operatively connected with the inner drilling device, and wherein the shaft has a plurality of shaft splines thereon formed to cooperate with the planetary gear system. A method of drilling a well bore with the novel drilling device is also disclosed.

Abstract: A peck feed drill incorporates a motor gear quill and a feed control assembly together on a moving race track shaped piston. External construction of the housing permits mounting of an indexing adaptor plug for attachment of drill bushings. Internal construction of the housing provides for passage of air to the various components to which control tool operation. Valves within the air logic circuitry are multi-functional to minimize the number of parts.

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 apparatus for machining is disclosed having a hydraulic motor directly coupled to a tool spindle. Mounting means are provided for mounting the hydraulic motor and spindle to a machine tool. A source of hydraulic fluid is provided at a pressure that varies directly with load.

Abstract: A toolhead assembly for a machine tool generally consisting of a housing supportable on the machine tool and having at least one elongated bore therein, a liner formed of a structural polymer material disposed in the bore, adhesively secured to the housing and having a cylindrical inner wall surface, a spindle shaft journal in the housing and disposed coaxially in the liner for axial displacement therein, the spindle shaft having a head section rigidly mounted on the spindle shaft and engagable in sliding relation to the liner inner wall to provide fluid chambers on either side thereof, means for injecting fluid under pressure selectively into the chambers for axially displacing the spindle shaft, means for spinning the spindle shaft about its axis and means for securing a tool bit to the spindle shaft.

Abstract: A peck feed drill incorporates a motor gear quill and a feed control assembly together on a moving race track shaped piston. External construction of the housing permits mounting of an indexing adaptor plug for attachment of drill bushings. Internal construction of the housing provides for passage of air to the various components to which control tool operation. Valves within the air logic circuitry are multi-functional to minimize the number of parts.

Abstract: A portable milling apparatus is disclosed where said apparatus, in one embodiment, comprises a cutting head, a control mechanism and a power supply where said cutting head generally includes a frame, an axial displacement means, a rotary cylinder and alignment means.

Abstract: A toolhead assembly for a machine tool generally consisting of a housing supportable on the machine tool and having at least one elongated bore therein, a liner formed of a structural polymer material disposed in the bore, adhesively secured to the housing and having a cylindrical inner wall surface, a spindle shaft journal in the housing and disposed coaxially in the liner for axial displacement therein, the spindle shaft having a head section rigidly mounted on the spindle shaft and engagable in sliding relation to the liner inner wall to provide fluid chambers on either side thereof, means for injecting fluid under pressure selectively into the chambers for axially displacing the spindle shaft, means for spinning the spindle shaft about its axis and means for securing a tool bit to the spindle shaft.

Abstract: A small, portable, light-weight pneumatic spot weld drill comprises a drill housing assembly which includes a trigger assembly for providing a supply of pressurized gas. A piston assembly is positioned within the drill housing assembly and is axially translatable thereto. The piston assembly is actuated by the pressurized gas so as to provide cutting pressure for the drill bit. A motor assembly is contained within the drill housing assembly. The motor assembly has a rotatable output shaft for securing a drill bit and for providing rotary movement of that drill bit. A control valve is provided for receiving a supply of the pressurized gas and for controllably discharging the pressurized gas to the motor assembly. The control valve provides cutting pressure at a desired level and provides rotary motion of the drill bit.

Abstract: An airfeed peck drill includes a substantially cylindrical drill quill contained within a cylinder in a housing. On the rear end of the drill quill is located an offset piston, the offset piston provides force for the entry and exit of the drill quill into or from a workpiece. On the front end of the drill quill is a reaction bracket which is attached to a motion transfer arm. On the rear end of the motion transfer arm is an engagement arm which is constructed and arranged to engage a piston rod which extends from a damping cylinder.

Abstract: A self-feed drill assembly (10) for forming an opening within a work piece (20). The drill assembly (10) includes a power driven drill (12) having a rotating cutting element (18) and a mounting fixture (14) for maintaining the relative position of the power driven drill with respect to the work piece (20). The mounting fixture (14) includes a nose piece housing (22), a foot mount housing (24) and a means for releasably joining the nose piece housing and the foot mount housing in an axially coupled position. The nose piece housing (22) defines a first chamber (26) adapted to receive a leading portion of the power driven drill (12) and the foot mount housing (24) defines a second chamber (28) adapted to receive the nose piece housing and in communication with the first chamber such that at least the rotatable cutting element (18) extends through the first chamber, the second chamber and the foot mount housing to contact the work piece (20).

Abstract: An airfeed peck drill includes a substantially cylindrical drill quill contained within a cylinder in a housing. On the rear end of the drill quill is located an offset piston, the offset piston provides force for the entry and exit of the drill quill into or from a workpiece. On the front end of the drill quill is a reaction bracket which is attached to a motion transfer arm. On the rear end of the motion transfer arm is an engagement am which is constructed and arranged to engage a piston rod which extends from a damping cylinder.

Abstract: Tapping apparatus for tapping holes in workpieces is provided with a tap assembly that includes a tap fitted to a lower tip end of a vertical lead screw, there being means including a bushing for rotating the lead screw thereby to vertically advance and retract the tap relative to the a workpiece hole. Power operating means are provided to rapidly advance and retract the lead screw independently of rotating advance/retraction of the lead screw so as to more quickly locate the tap proximal the workpiece hole allowing that tapping commences with lessened need for lead screw rotation as a means of effecting lineal advance of the lead screw. This lessens the tapping cycle time and results in increased production rate with the apparatus as well as lengthening tap life.

Abstract: An airfeed peck drill includes a substantially cylindrical drill quill contained within a cylinder in a housing. On the rear end of the drill quill is located an offset piston, the offset piston provides force for the entry and exit of the drill quill into or from a workpiece. On the front end of the drill quill is a reaction bracket which is attached to a motion transfer arm. On the rear end of the motion transfer arm is an engagement arm which is constructed and arranged to engage a piston rod which extends from a damping cylinder.

Abstract: A pneumatic air feed peck drill adapted to drill in repetitive cycles including a rapid advance phase, a slower drilling phase, and a rapid retract phase. The rapid advance phase ends and the drilling phase begins at a set back position, an adjustable distance from the workpiece, to minimize a drill bit and workpiece damage. The drill includes a drill motor and feed cylinder powered by air to rotate and advance and retract the drill motor. The drill motor and feed cylinder is coupled with an air and mechanical control system including a hydraulic feed control unit having a piston rod coupled with the drill motor to dampen the advance of the drill motor during the drilling phase and to release for rapid retract and advance phases.

Abstract: A tube end preparing apparatus for precisely preparing the ends of tubes, including bent tubes. The apparatus includes a reference mechanism, a tube clamping mechanism, a cutting mechanism, and cutting head control mechanisms. The reference mechanism and tube clamping mechanism combine to precisely locate a flow tube with respect to defined reference indicia. The entire locating and clamping process not only provides accuracy and symmetry in aligning and clamping the flow tube relative to the desired reference indicia but can be accurately repeated with speed. The cutting mechanism includes a rotating cutting head mounted for longitudinal movement on a carriage. A control system controls the feeding movement of the carriage as the cutting head nears the end of the flow tube. A first stop mechanism causes a plunger to contact a micro-switch to stop the longitudinal movement of the carriage. A second stop uses a hard stop to prevent the carriage from overtravel due to momentum.

Abstract: A pneumatic air feed peck drill adapted to drill in repetitive cycles including a rapid advance phase, a slower drilling phase, and a rapid retract phase. The rapid advance phase ends and the drilling phase begins at a set back position, an adjustable distance from the workpiece, to minimize a drill bit and workpiece damage. The drill includes a drill motor and feed cylinder powered by air to rotate and advance and retract the drill motor. The drill motor and feed cylinder is coupled with an air and mechanical control system including a hydraulic feed control unit having a piston rod coupled with the drill motor to dampen the advance of the drill motor during the drilling phase and to release for rapid retract and advance phases.

Abstract: An air powered milling tool supported in the upper turret of a turret punch press is cycled simultaneously with a hydraulically- or mechanically-powered punch press ram in a multiple-stage cycle to perform a milling operation on a sheet material workpiece retained between the upper and lower turrets of the punch press. The air-powered tool, which includes a punch head in coaxial alignment with a guide sleeve, drives an end mill which is contained within and is coaxially extendible through the guide sleeve toward the workpiece to perform a machining operation thereon. Hold-down bearings disposed at the end of the guide sleeve engage with the workpiece at a local region thereof. A spring-biased lifter disposed in the upper turret is engagable with the guide sleeve. In operation, the punch press striker impacts the punch head of the milling tool, urging the milling tool and air motor in the direction of the sheet material.

Abstract: An improvement to an air logic circuit for an airfeed peck drill includes the insertion of an advance valve into the timer circuit. This advance valve generates a signal to actuate the timer circuit only after the drill quill has fed forward through rapid advance.

Abstract: A drilling tool having a cutter for drilling a hole in a workpiece is disclosed. The tool has a special peck drilling mechanism that controls the advancement and retraction of a cutter such that the cutter is advanced into the workpiece a short distance and then withdrawn. The peck drilling mechanism enables this cycle of advancing and then withdrawing the cutter to be repeated until the cutter bore a hole in the workpiece to the desired depth. Cycling of the tool in this manner is controlled by a clutch assembly and a retract mechanism that are pneumatically connected to each other and to the feed piston such that the number of cycles of the tool and the total depth of penetration by the cutter into the workpiece can be controlled.

Abstract: A hand-held automatic drilling machine includes an expandable locating collet or locating pin, a pair of adjustably mounted drill bits for simultaneously drilling a pair of spaced-apart openings in a workpiece and a rotary drive motor for the drill bits. The machine also includes a first drive assembly for activating the expandable collet and a second drive assembly for advancing the drill bits into the workpiece. An adjustable dashpot provides resistance to the second drive assembly, thereby controlling the force applied to the drill bits and thus the feed rate. A bi-stable control valve commences the drilling cycle in one state and sequentially activates the first drive assembly and the second drive assembly. A full depth sensor moves the control valve to the opposite state, sequentially deactivating the second drive assembly and the first drive assembly.

Abstract: The present invention relates to a boring device adapted to bore the lining material blocking a branched portion where there is an opening for connecting a main pipeline with a branched pipeline (33), after the inner surface of a pipe (31), such as a gas conduit, a city water conduit or a sewerage pipe, in particular, a conduit buried in the ground, has been lined with lining material (30) for maintenance, repairs and reinforcement purposes.The features of the boring device reside in improvements of the mode of attachment of the television camera (8) for projecting the position of the leading end of the borer (28) on its screen, the mode of attachment of the borer (28) to the body (9), the driving system of the borer (28), and also of the cutting blades of the borer (28) for cutting off the lining material.

Abstract: A hydraulic drive (10) for the adjustment, feed and return movements of a tool head of a machine tool comprises a hydraulic motor (11) and an after-running adjustment valve (12). The reference value of the position is set and the actual value indicated by means of a threaded spindle (39) and spindle nut (37) in the form of a hollow shaft. One of these two elements can be driven by an electric motor (41) in order to set the reference value of the position. The other of these two elements can be driven in order to indicate the value of the actual position. A rotational and angular position indicator system (68, 74, 75 and 69, 77) produces an output which is a direct measure of the total number of revolutions executed by the preset reference value shaft and of the azimuthal position of the preset reference value shaft within each revolution. An electronic position sensor system (71, 78 and 71', 78'; 71") produces an output which is a measure of the contouring error S.

Abstract: A tool head for moving a tool to a workpiece and applying an axial force thereto includes a grooved tubular spindle mounted on a fixed shaft for relative axial and rotational movement. The spindle is rotated by a timing belt transmitting power from a driver timing pulley. The timing belt is fitted around the timing pulley and grooved spindle with a pair of 90.degree. twists in the loaded and unloaded sections between the two pulleys. As power is applied to the timing pulley, the belt migrates toward the end of the pulley and the spindle closest to the unloaded section of the belt; and when a resistant torque is applied to the spindle the timing belt migrates to a stable position with respect to both the timing pulley and the grooved spindle and transmits torque and an axial force to the spindle.

Abstract: The invention relates to a method and equipment designed to drill countersunk holes on surfaces of unknown positions in which a presser fitted to the tool support is placed against the surface to be drilled, and can move axially in relation to the tool; the presser is used as a limit switch to control tool return.

Abstract: A hydraulic drive mechanism in a machine tool, in which both the ends of a feed rod connected to frontward/reverse rotation drive means are journaled in bearings by a base frame and a cylinder frame, a feed plate is threadably mounted on the feed rod between the cylinder frame and the base frame, reciprocatively movable members are connected to the rods of double-acting cylinders, the primary chambers and secondary chambers of these cylinders are respectively connected to the primary chambers and secondary chambers of double-acting drive cylinders being oil pressure sources for the first-mentioned cylinders, the drive cylinders are fixed to one surface of the cylinder frame and have their rods inserted through holes provided in the cylinder frame, the distal ends of the rods of the drive cylinders turnably connected to the feed plate, and the other surface of the cylinder frame is confronted to the base frame with a proper spacing therebetween.

Abstract: A universal interface unit is provided for use with a pneumatic drill having an axially extendable tool holder, the interface unit being adaptable for use with `valve in head` type and `thru head` type pneumatic drills of different sizes. The interface unit includes a compact housing which fastens to the pneumatic drill and houses one or more proximity sensors for sensing the position of extendable tool holder and also houses valves for controlling air flow to the extend and retract ports of the drill. The proximity sensors sense the position of the extendable tool holder and send signals to a remote controller. The valves receives signals from the remote controller and communicate with the drill extend and retract ports to control the tool holder position. The valves are plumbed to be easily convertible for use with either the `valve in head` type of `thru head` type pneumatic drills by removing two plugs and changing a fitting.

Abstract: An apparatus for installing a reopenable shut-off valve into a flowing high pressure pipe, such as the production pipe in an uncontrolled flowing well, utilizes a cylindrical outer saddle member attached around the production pipe and providing a housing for the drilling, finishing and plugging assembly. The saddle is welded directly to the pipe section or attached via an intermediate layer of epoxy to add rigidity and strength to the pipe section. A rotary drill is advanced completely through the surrounding saddle and the internal production pipe and is followed axially by a valve plug. Sealing engagement of the valve plug in the cut hole may be attained by expanding the plug with internal fluid pressure or by utilizing a tapered plug held in sealing engagement with the similarly tapered hole by the application of an axial sealing force. A method for accessing the production pipe at an underground location for attaching the pipe plugging apparatus a safe distance from the well head is also disclosed.

Abstract: An apparatus for providing a reciprocating motion. The apparatus has a housing block that contains twin piston guides in spaced apart relationship to one another. The piston guides each contain a piston that has a gear rack. The gear racks are connected by a pinion gear so that the movement of one piston will cause an equal and opposite movement of the other piston. The movement of the pistons is controlled by the application of a fluid pressure to one or both of the pistons. The travel of the pistons is limited by a mechanical stop at one end and a fluid cushion device at the other end. Tools for the altering of a workpiece may be attached to one or both ends of the pistons. In one embodiment, the apparatus is subjected to a rotary displacement achieved through the linear motion of one of the pistons.

Abstract: A peck feed drilling machine incorporates a pneumatically operated vane motor and peck feed components. The vane motor drives a conventional drill bit through a speed reducing gear train. The peck feed assembly includes a plurality of multi-state shuttle valves which cooperate with a drilling feed piston, a peck piston and a clutch assembly to incrementally advance and fully retract the drill bit to peck drill an aperture. The drilling machine also includes a dashpot which adjusts the feed rate of the drill bit, a second dashpot for slowing the drill bit as it breaks through the workpiece and countersinks, a threaded mechanism for adjusting the depth of drilling and a spring mechanism for slowing the advance of the drill bit just before it engages the workpiece.

Abstract: In order to improve a machine tool comprising at least one hydraulic drive for working motion or rapid motion operation connected via a supply pipe to a high-pressure network supplied by a high-pressure pump so that the drives can be operated with high pressure for working motion and to a substantial degree with low pressure for rapid motion, it is proposed that a low-pressure network supplied by a low-pressure pump be provided for operating the drive for rapid motion, that a flow-limiting member be arranged between the high-pressure network and the supply pipe for bringing about a pressure drop in the supply pipe during the rapid motion by limiting the flow of a hydraulic medium under high pressure and for maintaining the high pressure to a substantial degree during the working motion, and that the low-pressure network be connected to the supply pipe via a check valve which is open on account of the pressure drop during the rapid motion and closed during the working motion.

Abstract: A machining apparatus for machining a work piece wherein the work piece is held above the work stations of the machine tool base so that chips will fall downwardly during machining operations. The tools are successfully indexed to the work station so that chip removal need be accomplished only at a single place and to make the arrangement more compact.