Abstract: This machine includes a casing (2), a tool-holder spindle (4), a motor (6), a drive mechanism (12) having positive feed which mechanically connects the motor to the spindle and which includes a first drive member (32) for rotating the spindle, a second drive member (34) for driving the spindle in translation and which is screwed onto the spindle (4) in order to advance or return the spindle, and a clutch (36) having a return configuration which disengages the second member and the motor and an advance configuration which engages them. The clutch includes a rotary engagement member (44), a first key (48) which is movable between a position for connecting the rotary member to the motor and a position for disengaging the rotary member, and a second key (50) which is movable between a position for connecting the rotary member to the casing and a position for disengaging the rotary member.

Abstract: A portable, air powered drill has an automated feed system and an adjustable dwell for producing countersunk holes in a workpiece. The feed system uses hydraulic cylinders and pneumatic control logic to control the feed rate, and the dwell time of a countersink drill bit at the end of the drill stroke. A movable mechanical stop permits an operator user to adjust countersink depth. The control logic provides fully automatic feed of the drill bit, and adjustment of the dwell time to consistently produce identical countersunk holes in a variety of workpiece materials.

Abstract: A hydraulic stop for use in drilling or countersinking operations comprises a rotatable body for rotating a tool about its axis. A cage adapted to contact the surface of a workpiece when the tool has penetrated into the workpiece by a predetermined distance actuates a trip mechanism comprising a plunger-operated hydraulic valve as the tool penetrates the workpiece more than the predetermined distance. The plunger is of adjustable length. When actuated the trip mechanism allows the body to shrink in length suddenly. The cage is axially adjustable in relation to the body to set the predetermined depth at which the trip mechanism actuates. A plurality of holes spaced around the circumference of the body to which the cage is mounted allow drainage of coolant whatever the axial position of the cage.

Abstract: Driving engagement is obtained between an arbor held in a machine tool and a collet holder that supports a drill bit by locking balls that are secured in engagement with drive surfaces by a locking ring. A nose cone is adjustably attached to the front of the locking ring and when the nose cone bottoms out on the workpiece, continued movement of the drill bit assembly relative to the nose cone assembly causes the locking ring to allow the locking balls to disengage the collet holder after ½″ additional travel. Inner and outer springs reposition the clutch mechanism in its initial position for subsequent drilling operations.

Abstract: A thread-cutting apparatus with reversal of the direction of rotation with a sun-and-planet gear with an axially displaceable reversing device for reversing the direction of rotation of a drill, held in the grip of a spindle, which can be pulled out preferably against a length equalization spring after a given drilling head depth has been reached, especially reversing chucks with pressure equalization pipelines, which discharge into an equalization chamber, sealed by a movable wall from the outside air, wherein the reversing device is actuated by an external driving element, which can be actuated by a reversing signal generated by an actuator.

Abstract: An annular thread cutting die head for a power driven threading machine is comprised of an annular support plate assembly supporting a plurality of radially displaceable threading cutting dies spaced apart about the axis of the die head, and a cam plate assembly coaxial with and pivotal relative to the support plate assembly to radially displace the cutting dies. The cam plate assembly is spring biased to pivot relative to the support plate assembly in the direction to radially retract the cutting dies, and pivoting in the latter direction is controlled by a keeper mounted on the support plate assembly and engaging a keeper track on the cam plate assembly.

Abstract: A drilling machine and method of operation for drilling through holes in a workpiece while minimizing penetration of the drill tool into a back-up material which supports the workpiece. Before placing the workpiece on the machine, the vertical position of the back-up material is mapped. After selection of the drill site, the mapped position of the backup material proximate the drill site is retrieved. Using this information, a computer controller determines an absolute vertical position for a lower limit of the drill stroke. This lower limit is independent of the top of the workpiece or the thickness of the workpiece, thus eliminating the need to determine either of those values. The drill stroke is terminated once the drill tool reaches the lower limit, which is a nominal depth below the mapped position of the back-up material, insuring that a hole is completely drilled through the workpiece, while minimizing penetration of the back-up material.

Abstract: An automated drilling station for use in a computer controlled manufacturing system comprising an adjustable frame structure for releasably clamping a work piece in a planar work position, a chuck assembly adapted to operatively receive a selected drill bit, a drive train for selectively moving the chuck assembly on an axis perpendicular to the plane of the work position, feed racks for storing a plurality of drill bits of various predetermined sizes, a robot assembly for transferring a selected drill bit between the feed racks and the chuck assembly at a transfer station remote from the work position, a drive train for selectively translating the chuck assembly between the transfer station and work position and between locations on one side of the work piece aligned with predetermined drilling locations in the work position and a selectively rotatable turret having bushings of various sizes disposed about the periphery thereof for selective disposition in opposed relation to the chuck assembly at each predet

Abstract: A mechanical pecking method and device is provided wherein a spindle adapted to hold a tool such as a drill bit is mechanically reciprocated in a workpiece. Also provided is a control system and method for controlling the mechanical reciprocation of the spindle and a sensor for remembering the last point of advancement of the spindle during each peck cycle.

Abstract: A glass drilling machine for drilling holes in a sheet of glass in which each hole is partly drilled from one side of the sheet and is then finish drilled from the opposite side. The machine is made up of aligned first and second drilling devices which are attached near the ends of first and second pivotable arms, respectively, the first and second arms being periodically pivoted toward and away from the sheet to bring the drilling devices into and out of drilling engagement with the sheet. The first and second arms are releasably clamped to first and second spindles, respectively, which pivot about first and second axes, respectively, the first and second axes being spaced apart but close to one another and positioned remote from the drilling devices. The position of the first arm is adjustable along its longitudinal axis and the position of the second arm is adjustable along the axis of the second spindle.

Abstract: A controller for a magnetic base drill unit provided with a safety circuit which is constructed by connecting in series a relay provided with contacts for cutting the power supply to the drill motor and feed motor, a resistor and a diode. The relay is actuated when a voltage higher than the predetermined voltage to be applied to the feed motor in the hole cutting mode is applied to the feed motor during the hole cutting, thereby cutting the power supply to the drill and feed motors. The controller has a means for confirming the operation of the safety circuit which apply a test voltage higher than the maximum predetermined voltage to be applied during the hole cutting to the feed motor in the fall mode of the electric drill.

Abstract: In a cutting machine having a spindle drive motor, a die head which holds at least one cutting tool, and an automatic tool retracting means on the die head for detecting the completion of the cutting operation of a pipe to be cut by the cutting tool to automatically retract the cutting tool to its inoperative position, an automatic operation stopping apparatus including a detecting unit for detecting the operation of the automatic tool retracting unit and a switch for automatically breaking the electrical connection of the spindle drive motor in response to the detection by the detecting unit.

Abstract: In a process using a hand-held drilling device for forming openings in a construction material containing steel reinforcing members, during the drilling step the electrical resistance between the drill bit and the reinforcing members is continuously measured. If the drill bit contacts the reinforcing member the measuring circuit is shorted out and the electrical resistance drops. The drop in resistance can be used as a signal for cutting power to the drilling device or for declutching or braking the device.

Abstract: A drilling machine provided with an electromagnetic base comprises a first control system by which a warning device is actuated and/or a feed motor for automatically advancing an electric drill toward a workpiece is stopped when a load on the electric drill exceeds a prescribed first reference level while at work. A second control system further provided on the drilling machine is adapted to have the feed motor and/or the electric drill stopped when the load thereon is further increased and reaches a second reference level higher than the first reference level to assure high safety.

Abstract: To reduce dead times and waste of dummy boards necessary for preparing individual packages of stacked boards to be drilled, the latter are loaded on the table in a single stack and are drilled from the top in groups formed of a predetermined limited number of boards, drilling only partially into the next board to be drilled. The drilled boards are carried out of the stack which is reapproached to the drilling head. The drilling restarts by following the impression left by the tool in the preceding cycle on the partially drilled board. The numerically controlled drilling machine includes a table vertically movable to bring the stack against a fixed stop. A slide transversely movable after each drilling cycle engages the already drilled boards and carries them to an unloading support external to the table.

Abstract: The drilling machine comprises a pair of cross slides formed of two parallelepiped blocks of granite connected as a T above a horizontally stationary board carrying table. The transverse block carries two operating heads and, by means of pneumostatic bearings, guides their movement along the X-axis. The other block is guided by the machine frame by means of other pneumostatic bearings. Each head carries a spindle operable to lock and unlock the tool to permit automatic tool replacement from a corresponding tool magazine with provision for checking the integrity of the engaged tool. One of the heads can be disengaged from the X-axis servomotor and connected to the other one at a predetermined distance. Two series of equal printed circuit supports can be drilled simultaneously by using a single package of boards to be cut after the drilling or the etching. Tool changing and tool integrity checking operations can be effected simultaneously for the two operating heads.

Abstract: A drilling machine of the woodpecker type employs a spindle carrying a drill. The spindle is mounted for rotation in a housing having an attached feed screw and those members form an assembly that can be axially moved while the spindle rotates to enable the drill to be fed toward and retracted away from the work. The feed screw is engaged by a nut whose position is controlled by a rapid traverse mechanism which can rapidly retract the spindle away from the work and can rapidly advance the spindle toward the work. The rapid traverse mechanism holds the nut fixed in position in the interval between rapid advance and rapid retraction. A peck feed machanism is connected to the feed screw and repititively feeds the spindle toward the work by causing the feed screw to progressively advance into the nut in the intervals when the nut is fixed in position. A hitch feed is coupled to the feed screw and acts to prevent the drill from bottoming in the hole on rapid advance.

Abstract: A die-head of a cutting machine having a pair of relatively rotatable annular plates which retractably hold therebetween cutting tools extending in radial directions, one of the plates being provided with a tool retracting lever which is pivotably mounted thereto and which is directly engaged by a projection provided on the other plate, the lever being pivotally moved by a workpiece which extends axially in the plates.

Abstract: A die-head of a cutting machine comprising a pair of relatively rotatable annular plates which movably hold cutting tools therebetween, a tool retracting lever with a stop, pivotally connected to one of the annular plates, a slide integrally connected to the other annular plate and peripherally pressed by a spring, and a pivotable cam plate with a projection bearing against the stop, the slide having a groove into which is engaged the projection of the cam plate, whereby the displacement of the lever, resulting from the movement of a workpiece causes the cam plate to rotate, thus resulting in a rotation of the slide to automatically retract the cutting tools.

Abstract: A die-head of a cutting machine having a pair of relatively rotatable annular plates which retractably hold therebetween cutting tools extending in radial directions, one of the plates being provided with a tool retracting lever which is pivotably mounted thereto and which is engaged by a slide which is slidably arranged on one plate and which tends to rotate together with the other plate by a spring force, the slide being slide to cause relative rotation between the two plates when the lever is pivotally moved by a workpiece which extends axially in the plates.

Abstract: A depressed drill assembly and vibratory work piece support for abrasive cutting in a zone immersed in liquid with or without abrasive grit, wherein vertically disposed excursions aligned with the gravitational axis of the drill assembly intermittently lifts the latter for access and entry of said grit and/or liquid into the cutting zone intermediate the drill and work piece, whereby holes are accurately cut through gemstones and the like.