Abstract: A boring tool, including a housing part (3), a fisture (35) for transmitting a rotational movement to a borer, the transmitting fixture (35) being supported in the housing part and having a central receiving region (36) for receiving the borer (4), two, spaced from each other, bearing members (33, 34) for supporting the transmitting element (35) in the housing part (3), and an arrangement for enabling inclination of a longitudinal axis of the borer (4) relative to the housing part (3).

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: The present invention provides vibration damping method and apparatus that can damp vibration in more than one direction without requiring disassembly, that can accommodate varying tool dimensions without requiring re-tuning, and that does not interfere with tool tip operations and cooling. The present invention provides active dampening by generating bending moments internal to a structure such as a boring bar to dampen vibration thereof.

Abstract: A cutting method using a vibratory cutting tool enables efficient creation of chips by breaking or separating of chips, and can retard both a deterioration of machined surface roughness of a workpiece and an increase in cutting resistance. The vibration of the cutting tool is controlled so that the following expressions are satisfied when letting a period of rotation of a workpiece be T, a period of vibration of the cutting tool be t.sub.total, the time required for the cutting edge to move from a farthest position in the feed direction to a farthest position in the direction opposite to the feed direction be t.sub.d, and the time required for moving from the farthest position in the direction opposite to the feed direction to a next farthest position in the feed direction be t.sub.u in the period of vibration of the cutting edge: T.apprxeq.t.sub.total .times.n+t.sub.d, where n is 0 or a positive integer; and t.sub.d .noteq.t.sub.u.

Abstract: An apparatus for controlling a tapping-drilling machine is disclosed in which holes can be formed by means of drilling tools, and threads can be formed by means of tapping tools. A worm is elongately formed on a spindle, and a worm wheel which is meshed with the worm is secured by a lateral shaft. At the leading end of the lateral shaft, there is installed a brake. In the preferred embodiment of the present invention, the electronic type brake is employed, and the electric current flowing through this brake is adjusted, so that the velocity of the vertical movement of the spindle sleeve (which is defined to be the ratio of the vertical moving distance to the revolutions of the spindle) can be automatically adjusted.

Abstract: A device for transmitting impulse-like blows to a continuously rotatable tool bit (6) is formed as an axially extending adapter (1) having a first chuck for the tool bit (6) and being insertable at a trailing end into a second tool bit chuck in a manually operated tool equipped with a striking mechanism. The adapter (1) has a housing (2) containing a unit for superimposing a second blow component on the first impulse blow component produced by the striking mechanism, so that an impulse-like drilling blow can be transmitted to the drill bit (6) made up of an axially directed blow component and a torsional blow component.

Abstract: In an apparatus for detecting an abnormality of a control system, the internal property calculating section thereof calculates an internal property of the control system only on the basis of a command value representing a position or a speed of the control system, and the abnormality judging section judges the existence of abnormalities of the control system on the basis of an internal property calculated by the internal property calculating section and an actual internal property of the control system. Consequently, the apparatus can precisely detect abnormalities without being influenced by an observed noise or an operational error.

Abstract: A precision drill for drilling noncircular bores, comprising a drill bit on a shaft and a holder for the workpiece being drilled, for providing a drill that can operate economically at high speeds. The workpiece holder oscillates translationally in at least one direction at a frequency controlled by the speed of the drill bit, and moves along a path determined by the desired shape of the bore to be drilled.

Abstract: A drill press has a drive motor with output shaft that drives a chuck through a rotatable and vertically displaceable quill and a first drive coupling which includes a pair of pulleys, such as cone pulleys, and a belt extended between the cone pulleys. A rotary power take-off in the form of an additional pair of pulleys and a drive belt extracts rotary power from the drive coupling between the motor and the chuck and transfers it to an oscillatory motion device. The device includes a worm and worm gear and an eccentrically mounted arm which convert rotary motion from the rotary power take-off into a reciprocating linear motion. A lever is pivotally mounted to the device with one end engaged with the quill and a remaining, opposing end coupled with the arm. Reciprocation of the arm causes reciprocation of the lever which causes reciprocation of the quill, chuck and any tool held in the chuck. The arm is releasably engaged with and is coupled with the lever through a detent block.

Abstract: The invention provides a unique approach to solving a peck feeding problem in limited access areas restricting the drilling unit size. It uses a power transmission system which is comprised of a pinion gear driven by a motor source. The pinion gear drives a bevel gear that is free to travel along a polygon quill. A quill had is located on one end of the quill to house the drill. The opposing quill end is attached to a guide bushing assembly. The guide bushing assembly is connected to a bell crank mechanism that is actuated and controlled by a pneumatic piston and hydraulic speed control system. The power transmission system, and the pneumatic power transfer system combined produce a pecking cycle for drilling precision holes within a confined set-up space of 5.5 inches in a preferred embodiment. It preferably has a drill stroke up to 1 inch deep, and is capable of producing a "pecking" action which is unique for right angle drilling equipment in limited access applications.

Abstract: In a system which interrupts the infeed signal generated by a CNC machine drive signals are applied to at least an RPM Control Electronics Module to drive the rotation of a cutting tool and the infeed drive motor electronics. A solid state relay intercepts the infeed signal and is driven into an on off state by a Variable Frequency Generator. This causes the solid state relay to enter the on off state in response to the input frequency and interrupts the infeed signal applied to the infeed motor electronics in synchronization with the frequency generated. The frequency is user selectable and the frequency used to eliminate or minimize chip formation is dependant upon the material being drilled, the infeed rate, the RPM of the tool, and the diameter and point geometry of the tool so adjustment by the machine operator is required. This permits the user to vary the specific frequency to select a frequency which is suitable for elimination of spirals in a given set of circumstances.

Abstract: A manual tool for removing material from brittle and/or non-ductile stock includes a housing (1) with a drive unit (2) for a tool bit (3) located within the housing (1). The tool bit is arranged to be rotated by the drive unit (3) about the bit axis. In addition, an electro-acoustic converter (4) for producing ultrasonic vibrations and a vibration amplifier (5) are positioned within the housing for superimposing ultrasonic vibrations on the rotational action of the tool bit during operation on the manual tool.

Abstract: A method of drilling ductile materials with split-point drills includes the steps of placing a split-point drill above a ductile material having an entrance side, drilling a hole in the ductile material with the split-point drill from the entrance side to an exit side thereof, breaking through a surface of the exit side with the split-point drill a first predetermined distance to form a drill cap, retracting the split-point drill a second predetermined distance, and accelerating the split-point drill through the surface of the exit side to remove the drill cap from the ductile material.

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 apparatus for drilling lock wire holes in lock wire nuts includes a variable speed drill press mounted on a work bench and having a vertically movable drill quill supporting a rotating drill spindle on one end of which is mounted a drill chuck for holding and driving a drill bit for drilling a hole in the lock wire nuts. An N/C microprocessor is coupled to the drill press for controlling the vertical motion of the drill quill in a peck drill cycle. A nut holder, including a collet chuck having three jaw inserts is mounted in a chuck indexer for positioning the chuck in any of three 120.degree. angularly spaced positions about a central longitudinal axis through the chuck. A drill guide in each of said jaw inserts guides the drill bit at an angle against said faces of said nuts to drill lock wire holes through the nut lobes.

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: 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: The formation of intermittent chips or chip breakage is assured while machining holes using a rotating tool means by causing the undeformed chip thickness to vary periodically and be reduced to zero in each period of its variation. To obtain the periodic reduction of the undeformed chip thickness to zero, a cutting tool is made to oscillate along its axis of rotation. Tool oscillation is controlled so that the position of the tool along the feed advance path depends on the angular displacement of the tool. The number of oscillation cycles per revolution of the tool may be freely chosen depending on the required length of chip segments. The oscillation amplitude needed to form intermittent chip depends on this number, feed advance per revolution, and number of major cutting edges of the tool means. The oscillatory movement of the tool may be enforced in many ways.

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: An improved automatic spindle moving device for a tapping/drilling machine is disclosed. A worm is formed on a spindle in an elongate form in the lengthwise direction thereof, and a pair of worm wheels are meshed with the worm, while the worm wheels are supported by horizontal shafts. A braking means is installed on the leading end of the horizontal shaft, so that the worm wheels can be braked, thereby reducing the revolution speed of the spindle. The power corresponding to the revolution speed reduction is converted to elevating or lowering the spindle, so that the spindle should move up and down. Thus repeated automatic continuous tapping is rendered possible, and the up and down movements of the spindle can be arbitrarily adjusted. Further, during a drilling operation, holes can be drilled to a uniform depth repeatedly, while a pedal can be utilized in tapping or drilling. Thus tapping internal threads and drilling holes are rendered more convenient and easier.

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 metal turning chip breaking apparatus includes an impulse actuator in the form of a piezoelectric element that rapidly expands and contracts in response to a rapidly applied and removed voltage. This, in turn, is used to impulsively move a cutter support in a matching fashion, causing a cutter to rapidly withdraw from and return to the cut in a chopping action. This breaks up the chip, which would otherwise form continuously. There is no need to synchronize the incremental motion of the cutter with the rotation of the workpiece.

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 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: The formation of intermittent chips or chip breakage are assured while machining a rotating workpiece by causing the undeformed chip thickness to vary periodically and be reduced to zero in each period of its variation. To obtain the periodic reduction of the undeformed chip thickness to zero, a cutting tool is made to oscillate along its feed advance path. Tool oscillation is controlled so that the tool's position depends on the angular displacement of the rotating workpiece. The number of cycles of tool oscillation per revolution of the workpiece may be freely chosen depending on the required length of chip segments. The oscillation amplitude needed to form intermittent chips depends on this number, feed advance per revolution, and number of simultaneously applied cutting edges of the tool. The oscillatory movement of the tool may be enforced in many ways.

Abstract: The states of contact switches are switched when a mode switch is turned on. If the drilling operation is effected by means of a drill motor in this state, an oscillation signal which is repeatedly set to "H" and "L" in a preset period corresponding to an output of an oscillator is supplied to the control terminal of a firing pulse generator. The firing pulse generator interrupts supply of the control signal to the control terminal of a triac in the above preset period based on the oscillation signal supplied to the control terminal thereof to interrupt supply of an AC power source from a commercial AC power source to a bridge-type rectifier so as to intermittently drive a feed motor which is energized by an output of the rectifier in the above preset period. As a result, the drill motor can be intermittently fed towards a to-be-worked object by means of the feed motor, and, when the feeding operation is interrupted, a cutting operation can be instantaneously stopped and swarf can be cut apart.

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 a method of and an apparatus for drilling a hole in a workpiece, a pressure foot associated with a drill is moved into contact with the workpiece, and a drill bit associated with the drill is moved from a drill-starting position into the workpiece, toward the drill-starting position and again into the workpiece while maintaining the pressure foot in constant contact with the workpiece. The drill is reciprocally fed by a plurality of times under the pressure of the pressure foot acting upon the printed circuit board. In either of the method and the apparatus, a hole with a high aspect ratio can be formed in a workpiece made from a thin, flexible material.

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 nose piece for use with an airfeed drill includes a cylindrical portion which has on one end a truncated cone for mounting a drill support bearing and on the other end a flange. Formed within the flange are a plurality of slots. These slots correspond to an array of rotatable fasteners and locking pieces mounted on the front of the housing. Attachment of the nose piece to the housing is accomplished by placing the slots over the fasteners and locking pieces and tightening the fasteners.

Abstract: An apparatus for drilling a hole in a workpiece such as, for example, a printed circuit board wherein a pressure foot, associated with a drill, is moved into a position to exert a pressure on the workpiece. A drill bit associated with the drill is moved with respect to the workpiece, and an arrangement is provided for controlling the operations of the pressure foot and the drill bit in such a manner so as to move the drill bit from a drill starting position into the workpiece, then toward the drill starting position and again into the workpiece while maintaining the pressure exerted on the workpiece by the pressure foot.

Abstract: Disclosed is a tapping control system capable of performing tapping work with high accuracy and reliability in a manner such that rotation of a tap by means of a digital spindle motor (1) is synchronized with axial drive of the tap by means of a servomotor (2).A digital control circuit (5), used to drive the spindle motor, is supplied with a speed command from position control means (4). The speed command is based on a distributed pulse from an interpolating circuit (3a) for linear interpolation in accordance with the pitch value of a screw to be worked, and a feedback signal indicative of the rotational position of the spindle motor. Also, a servo-circuit (12) for the servomotor is supplied with a distributed pulse from the interpolating circuit. Thus, the two motors are driven synchronously.According to an aspect of the present invention, the tapping work is performed in a fixed cycle such that forward and reverse rotations of the two motors are repeated to reciprocate the tap.

Abstract: A device for adjustably controlling the position and set-back of a piston rod which extends from a damping cylinder used on an airfeed peck drill. The device includes a plurality of ball members which surround the piston rod. The ball members are positioned against the piston rod by a spring biased cone having a tapered internal surface. The balls are further positioned with respect to the cone by a spring biased ball separator which is movable with respect to the cone by air pressure. The travel of the piston rod is made adjustable by a nut member threadably engaged with the housing.

Abstract: In a method of drilling a printed circuit board according to the present invention, an entry feed rate at which a drill is fed into the printed circuit boards during the initial stage of drilling is made slightly smaller than a drilling feed rate at which the drill is fed while it is drilling a hole through the printed circuit boards, so as to enhance the accuracy at which holes are located. One drilling operation includes a plurality of drilling feeds of the drill, and pulled-out positions of the drill which are reached by the drill between adjacent drilling feed rate are set within a range in which the pressure of a pressure foot is effective. This can prevent the stacked printed circuit boards from shifting and increase the accuracy at which the holes are located.

Abstract: An improvement to an air logic circuit for an airfeed peck drill includes the insertion of a retract valve between the command valve and the air motor.

Abstract: A boring device has a spindle moving mechanism which retards a tool spindle when the spindle rotates through a predetermined angle. The mechanism has coaxial first and second thrust rings. Thrust balls are disposed between the thrust rings in rolling contact therewith. A retaining element holds the thrust balls such that they keep constant circumferential spaces therebetween. The first thrust ring is fixed to the tool spindle and has recesses in the surface facing the second thrust ring. The second thrust ring is fixed to the casing of the boring device. As the first thrust ring is rotated by the tool spindle, the thrust balls are fitted in the respective recesses, whereby the tool retards by the amount equal to the depth of the recesses. Then, cutting edges of a cutter is separated from the face of a workpiece which is being cut, and a continuous chip is broken into pieces having a predetermined length and is removed from a hole being formed.

Abstract: A boring device includes a casing and an upwardly biased tool spindle supported in the casing so as to move in a feed direction and a return direction opposite thereto. A first thrust ring with a track surface is disposed coaxial with the tool spindle and is fixed thereto. A second thrust ring with a track surface is also disposed coaxial with the tool spindle and fixed to the casing such that the track surfaces of the first and second thrust rings face each other. A rolling element retaining ring is provided coaxially with the tool spindle between the first and second thrust rings and has bores circumferentially arranged at predetermined angular intervals. Rolling elements are fitted in the bores of the rolling element retaining ring such that the rolling elements roll on the track surfaces of the first and second thrust rings. Receptacles complementary to the bores are formed in the track surface of the first thrust member.

Abstract: A boring device includes a casing and an upwardly biased tool spindle supported in the casing so as to move in a feed direction and a return direction opposite thereto. A first thrust ring with a track surface is disposed coaxial with the tool spindle and is fixed thereto. A second thrust ring with a track surface is also disposed coaxial with the tool spindle and fixed to the casing such that the track surfaces of the first and second thrust rings face each other. A rolling element retaining ring is provided coaxially with the tool spindle between the first and second thrust rings and has bores circumferentially arranged at predetermined angular intervals. Rolling elements are fitted in the bores of the rolling element retaining ring such that the rolling elements roll on the track surfaces of the first and second thrust rings. Receptacles complementary to the bores are formed in the track surface of the first thrust member.

Abstract: A tool or a workpiece is fed by the cut feed by cut feed commands during periods when the tool or the workpiece would normally be fed by rapid feed. These periods are chosen to occur when the distance of the sections to be fed is a predetermined distance or less. Then, in the case that the feeding distance is the predetermined distance or less, the tool or the workpiece can be fed more rapidly by cut feed rather than rapid feed. Thus, machining time is shortened to that extent.

Abstract: A boring device has a spindle moving mechanism which retards a tool spindle when the spindle rotates through a predetermined angle. The mechanism has coaxial first and second thrust rings. Thrust balls are disposed between the thrust rings in rolling contact therewith. A retaining element holds the thrust balls such that they keep constant circumferential spaces therebetween. The first thrust ring is fixed to the tool spindle and has recesses in the surface facing the second thrust ring. The second thrust ring is fixed to the casing of the boring device. As the first thrust ring is rotated by the tool spindle, the thrust balls are fitted in the respective recesses, whereby the tool retards by the amount equal to the depth of the recesses. Then, cutting edges of a cutter is separated from the face of a workpiece which is being cut, and a continuous chip is broken into pieces having a predetermined length and is removed from a hole being formed.

Abstract: A drilling tool for one of stationary and mobile use as, for example, a hand tool, and especially a motor powered tool capable of rotary drilling, percussion drilling, or hammer drilling for drilling into concrete, rock, or the like materials and/or in metals of various types. The drilling tool includes a drill head on a shank encompassing at least a bit shank and has a recess extending through the drill head coaxially to a longitudinal axis of the bit shank, which recess is adapted to receive a drilled core. The recess is constructed as a central bore and is provided at an end facing away from the drill head with an outlet or discharge orifice for the drilled core material collected in the recess. The outlet or discharge orifice of the recess in arranged in the shank zone provided outside of the drill head.

Abstract: A machine tool for machining a workpiece by feeding a cutting tool into the workpiece in a series of discrete steps wherein a constant value is stored for each of those steps, a calculation is performed responsive to the value of a variable factor affecting operation of the cutting tool, such as cutting tool diameter and/or workpiece material coefficient, to calculate for each of the discrete steps a feed value as a function of the corresponding constant value for that step and as a function of the value of that factor. Control means is provided for feeding the cutting tool into the workpiece as a function of the feed values thus calculated for a plurality of steps. Upon completion of feeding for any one step, the cutting tool is at least partially withdrawn from the workpiece and the cutting tool is subsequently feed into the workpiece as a function of the feed value of the next step.

Abstract: A hydraulic control system for a downhole sidewall coring tool having first and second power hydraulic systems in which changes in pressure drop in a portion of the first hydraulic system adjusts a control valve to change the pressure in a part of the second hydraulic system. Means are provided to adjust the operation of the control valve as a function of viscosity change in the hydraulic fluid caused by change in ambient temperature.

Abstract: In a computer controlled drilling process for emitting holes of a very small diameter, a control device controls a step motor in response to open loop instructions from the computer.

Abstract: A method of processing a scroll member having a spiral wrap and an end plate which is conducted by effecting a shaving on at least one side surface of the spiral wrap by a tool while applying to the tool both of an axial small force and an ultrasonic oscillation simultaneously. An apparatus is proposed which comprises a shaving tool having a spiral groove of the same configuration as the spiral wrap, and a cutting edge portion formed on at least one side edge of the groove over the entire length of the side edge. A tool supporting device supports the shaving tool, and a blank supporting device supports a scroll blank such that the scroll blank opposes to the shaving tool. A device is connected to the tool supporting means and is adapted to impart to the tool a pressing force necessary for effecting the shaving, and an ultrasonic oscillation generating device is adapted to impart an ultrasonic oscillation to one of the tool or the blank.

Abstract: A holding or checking means for holding the control rod of a reciprocating drill feed control apparatus in position after each advancing movement of an automatic drilling machine during a "peck drilling" operation. The holding means includes a cylindrical body adapted to be fastened over the end of a drill feed control apparatus and with the control rod of the feed control apparatus extended through said body. A pair of pivotally mounted yoke arms are mounted on a cylindrical body and have semi-circular recesses adapted for friction holding engagement with the feed control rod to hold it in an advanced position when the reciprocating drill apparatus is retracted. The holding means includes a biasing means for biasing the yoke arms into friction engagement against the control rod.

Abstract: A cam operated machining unit for use in providing principally, either, a drilling, reaming, counterboring, trepanning or threading function, upon another component being machined, the unit includes a spindle rotatably supported within a quill, with the spindle having the tool held therein, with the combination of the spindle and quill being disposed for longitudinal shifting, especially in a rapid approach, a constant feed speed, and then a rapid retraction from its position of performing a machining function upon the component being worked; the composite spindle includes a first gear, and which interconnects by a series of intermediate gears with a cam shaft arranged gear, with the cam shaft holding a cylindrical cam which is intermated with conjugate cam followers, that are fixed upon the quill, all being operatively associated with drive means furnishing the rotational movement for turning of the spindle and its tool, with the intermediate gears translating its rotational force to the cam for inducing the