Abstract: A toolhead assembly for a CNC machine displaceable along orthogonal x, y and z-axes generally consisting of a support assembly, a tool carrier supported on the support assembly having a rotatable tool axis and being displaceable relative to the support assembly between a first position wherein the tool axis is aligned with the z-axis and a second position wherein the tool axis is misaligned with the z-axis, structure for yieldably biasing the tool carrier assembly into the first position and structure responsive to a displacement of the tool carrier assembly to the second position for breaking an electrical grounding circuit of a controller operatively connected to the machine.

Abstract: A device for detecting thermally caused linear expansions of a machine element, wherein the device includes a temperature sensor placed along an expansion direction. The temperature sensor includes a first metallic conductor having an electrical resistance that is proportional to an average temperature of an area to be monitored and a plurality of trimmer tracks in the form of further metallic conductors placed next to the first metallic conductor. The temperature sensor further includes electrical connections selectively interconnecting the plurality of trimmer tracks with the first metallic conductor and wherein the plurality of the trimmer tracks have an effective electrical resistance that is proportional to the average temperature of the area to be monitored.

Abstract: A hand tool device (1), for a partially rotationally driven drill tool (2), including an electronic depth stop (3) with a sensor (4) for non-contacting gauging of a distance and a calculator component (5) for calculating the depth (T) of a drill bit tip (8) relative to a reference surface (10), and signaling when a measured value attains a set value (S). The set value (S) can be transmitted into a set value memory (6) using a single manually operated transfer accept actuation.

Abstract: A method of controlling a relative movement of a cutting blade and a workpiece which are moved relative to each other by a movement device in an operation with a machine tool. The method includes a step of bringing the cutting blade and an object into contact with each other, by moving at least one of the cutting blade and the object toward each other by the movement device, and a step of controlling the relative movement on the basis of a relative position of the cutting blade and the object which is detected by the movement device upon the contact of the cutting blade and the object with each other.

Abstract: A drill bit penetration measurement system and method for determining a depth of penetration of a rotating drill bit in a bore. A first sensor outputs a first signal representative of a displacement of the leading edge of the drill bit in the bore. A second sensor outputs a second signal representative of a force applied to the leading edge of the drill bit. A processor outputs a third signal representative of the depth of penetration of the leading edge of the drill bit when the leading edge of the drill bit passes from a first medium having a first density to a second medium having a second density. The third signal is based on the first and second signals.

Abstract: In order to produce a monitoring device for checking for a predefined position of a body or checking for the presence of a body, comprising a pivotal check element, a motor for driving the checking element and a housing for accommodating the motor, which will be universally employable especially in difficult working surroundings, it is proposed that a seal be arrangement between the checking element and the housing around a shaft by means of which the checking element is driven.

Abstract: The present invention provides a power tool with a hand proximity detector to detect the hand of an operator and a trigger circuit operable with the detector to control the operation of a light in the housing or to provide a safety lockout function. One embodiment includes an operating mode indicating light that is responsive to the detector.

Abstract: The method of and a device for using this method, on equipment or assigned to equipment for working a material, for investigating and identifying the nature of the material, which is to be worked and for making available at least one operating parameter for the optimized pre-setting of the working equipment, provides for the use of a sensor, preferably assigned directly to the working tool, such as a hammer drill, in order to detect shock waves generated or induced in the tool. From the shock wave signal measured, at least one distinguishing feature characteristic of the material to be worked, is extracted and evaluated for the comparative classification of the material by means of an algorithm. Preferably, an external force, especially the contacting force, acting on the working equipment, is taken into consideration for the algorithmic evaluation.

Abstract: The motorized specimen cutter has a replaceable rotary tubular cutting tip and a motor to rotate the cutting tip. Deflection caused by proper cutting force energizes the motor with enough energy to cut a specimen. A manually or automatically actuated ejector pin ejects the sample from the cutting tip.

Abstract: An adaptive control system for adaptively controlling a turning operation performed at a work piece by a turning tool adjusts a controlled input operation parameter F to maintain an output operation parameter &Dgr;M substantially at a predetermined value &Dgr;Mo to compensate variation of the output operation paramemeter &Dgr;M caused by the variation of at least one operation condition B=B (t). The system comprises a sensor (8) of the output operation parameter &Dgr;M for providing a signal Uc proportional to a current value &Dgr;Mc and an adaptive controller (10) for determining a value Fc to which the input operation parameter F should be adjusted, as a function of kUc, where k is a signal transmission coefficient which comprises an invariant signal transmission coefficient component ko inversely proportional to &Dgr;Mo.

Abstract: A tool holder assembly 10 including a tool holder 12 having a balancer assembly 21 adapted to selectively provide improved unbalance compensation.

Abstract: There is here disclosed a movement error compensating device for a movable unit such as a slider in a numerical control machine tool. A laser beam is emitted from a reference position beam generator installed on a fixed base in the movement direction of the slider. The slider is provided with a beam passing position detector, which detects a deviation on YZ planes of the laser beam. In order to properly detect the irradiation direction of the laser beam, the fixed base is equipped with a movement end beam position detector.

Abstract: In a thermal equalization system a machine tool carriage preferably of aluminum but which could be made of other lightweight materials, a drilling spindle housing is mounted on the carriage. At least one spindle housing is be mounted said carriage to service work pieces mounted on a tooling plate of the work table for said spindle. The chiller unit is used to provide coolant to the spindle to compensate for the heat generated by the spindle during drilling. When the spindle is not drilling, excessive cooling of the spindle can result. Accordingly, the instant invention also includes, a conductive rubber heating pad which is attached to the spindle structure to provide a heat source for the system to compensate for excessive cooling when the drill is not generating heat. The temperature control maintains the temperature between the spindle housing, carriage and work table thereby minimizing temperature expansion differentials between the drilling position and the worktable position.

Abstract: A spindle protective structure capable of reliably detecting coolant leakage from a jointing device and protecting a spindle. A flow sensor is provided in the line of a drain pipe for discharging coolant leaking from the rotary joint, so that an alarm is made when the flow of coolant in the drain pipe exceeds a predetermined value. Since the coolant leaking from the jointing device is detected directly and an alarm is outputted, coolant leakage can be found out more quickly than by observing visually whether the flow of coolant jetting from a tip of a tool is normal or not.

Abstract: A method of monitoring the condition of a tool in a machining operation for producing a plurality of toothed workpieces. The process comprises measuring the temperature of at least a portion of the plurality of workpieces each at essentially a same predetermined amount of time after machining. The temperature of each measured workpiece is compared to at least one workpiece reference temperature value indicative of a wear condition of the tool. If the measured temperature is less than or equal to the workpiece reference temperature value, machining of subsequent parts continues, or, if the measured temperature is greater than the workpiece reference temperature, the machining operation is stopped.

Abstract: The invention relates to a process and device for detecting and/or compensating for static jointing and wear errors in the fine drilling of workpieces by means of an adjusting tool (18) bearing an adjustable cutting insert (28) and capable of being clamped to a machine shaft (14). According to the invention, before a drilling or a series thereof is made, the diameter of the circle of travel of a radially outer cutting edge (44) of the cutting insert (28) is measured on the clamped adjusting tool with the machine shaft (14) rotating and evaluated within the adjusting tool (18) for adjustment purposes.

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

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

Abstract: A machine tool spindle is supported at its spindle nose in a front, rolling element mechanical anti-friction thrust and radial support bearing means. The middle and rear end of the spindle is supported in a magnetic radial rear bearing and further supported at a generally mid-position of the spindle by magnetic radial mid bearing. The two magnetic radial bearings provide radial suspension of the spindle and permit the spindle to slide freely. A spindle flange is axially forced by a magnetic axial thrust bearing to vary the pre-load of the mechanical anti-friction thrust and radial support bearing.

Abstract: A tool holder comprises a receptacle having one end connectable with a machine spindle, to a receptacle and the like and an opposite end, a head provided on the opposite end and having a coaxial cylindrical head opening, a housing received non-rotatably and axially longitudinally displaceable in the head opening and having a coaxial cylindrical housing opening, a quick exchange insert for a tool insertable in the housing opening and coupleable with the housing, and an inner signal device reacting to a relative movement between the head and the inserted quick exchange insert to produce a disturbance signal which identifies a damaged or a destroyed tool.

Abstract: The present invention relates to a dental drilling system having a programmable control unit. The control unit controls operating parameters of the drilling system, such as the direction of rotation, the speed of rotation and the torque of a tool bit of a dental drill, as well as the irrigation fluid flow rate generated by a pump and the intensity of light generated by a light source. The control unit can be programmed with a number of sets of data values. Each set of data values represents a desired value for each of the operating parameters to be controlled. Also, each set of data values corresponds to a different step in a dental operation. Thus, for each step of a dental operation, a surgeon can choose a desired set of operating parameter values from those sets that have been preprogrammed. The control unit then controls the operating parameters to achieve and maintain the values represented by the selected set of data values.

Abstract: An apparatus for adjusting the positioning of a locating ring upon a drill bit. The apparatus comprises a housing having a drill seat attached thereto for slidably receiving the shank portion of the drill bit. The apparatus further comprises an adjustment mechanism which is attached to the housing for positioning the cutting tip of the drill bit at a desired separation distance from the drill seat. Also included is a reciprocal ram assembly attached to the housing for selectively bumping the locating ring into abutting contact with the drill seat subsequent to the insertion of the shank portion into the drill seat and the positioning of the cutting tip at the selected distance relative the drill seat.

Abstract: An apparatus for tapping an opening into an existing pipeline that is under internal pressure including an elongated tapping machine body having means on one end for attachment to a pipeline, a boring bar having a rotatable feed screw therein by which the boring bar is axially positioned, and a pressure responsive valve actuated by differential pressure between the interior of a pipeline and the interior of the tapping machine body to control hydraulic pressure inside the tapping machine body to thereby counterbalance the hydraulic force applied to the boring bar.

Abstract: In a precision drilling method for drilling a straight hole in a work with a drill, a drill unit for rotating the drill is supported to a housing in suspension by an electromagnetic force consisting of separately controllable restoring and damping elements. The drill unit is supported by first restoring and damping elements such that a positional displacement of the drill unit is permitted to relieve a contacting pressure applied to the drill unit when the drill comes into contact with the work. The positional displacement of the drill unit is monitored by sensors. When a force applied to the drill unit, which is determined according to thus monitored displacement, is greater than a critical value, the first restoring element is increased to give a relatively strong support capable of rapidly restoring the position of the drill unit, and preferably the first damping element is also increased to rapidly damp a vibration of the drill unit induced by the positional displacement.

Abstract: An improved machine tool having means for automatically sensing axial movement of the jaw members relative to the collet housing and for adjusting the axial position of the collet to automatically compensate for the jaw movement to allow radial gripping of the workpiece with no axial movement.

Abstract: A sensing assembly is provided which, by utilizing the CNC machine's M-codes, is adapted to be retrofitted to existing numerical control machines for detecting the excessive wear, chipping, breaking or mislocation of the cutting tool and shutting down the CNC machining operation in response.

Abstract: When tapping is effected by a tap driven by a built-in spindle motor (12) and another motor (22), which built-in spindle motor directly drives the tap (14) to rotate without a transmission mechanism, and which other motor drives the tap (14) with the built-in spindle motor (12) to proceed along a longitudinal direction (Z), the two motors (12, 22) are synchronously controlled, and the difference between a commanded rotational speed output to the built-in spindle motor (12) from a synchronous control unit (36) and an actual rotational speed of the built-in spindle motor detected by a detector (16) is calculated by a difference calculator (32), and an alarm is output, for example, by a light-emitting diode (40), when the difference is higher than a prescribed value. Thereby, a high-speed tapping can be effected, the number of defective products can be reduced, and the threads accurately tapped.

Abstract: An apparatus for receiving a tool carrier comprises a tool holder defining a receiving bore adapted to receive a portion of the tool carrier, an arrangement for supplying pressurized fluid to the receiving bore of the tool holder to clean adjacent surfaces of the tool holder and the tool carrier during insertion of the tool carrier into the receiving bore; and an arrangement for detecting the pressure of the fluid supplied to the tool holder for ascertaining whether correct operational positioning of the tool carrier exists with respect to the tool holder.

Abstract: A thread cutting machine where the rate of advance of the thread cutting tool is controlled by means of a control system whereby the rotation of the tool and its rate of advance toward the workpiece are both used to control the position of the cutting tool.

Abstract: An apparatus for measuring the shape and size of a rotary tool is provided which includes a tool rotation unit for rotating the tool around the tool axis, a tool moving mechanism for moving the tool in the axial direction, a measuring head having a line sensor, and a calculation control unit. The measuring head can be moved at a rate of a predetermined angle around a lateral shaft, located in a direction perpendicular to the axis of the tool, with one end of a measuring area of the line sensor as a center. Upon measuring the tool in terms of its shape and size, the aforementioned end of the line sensor is located in a position a given distance inside the aforementioned end of the tool, the line sensor is moved for every predetermined angle around a lateral shaft, with one end of the measuring area as a center, and measured values are fed to a computer through the line sensor, while the tool is rotated around its axis for every predetermined angle.

Abstract: A drilling machine comprises an electric drill having a drill motor for rotating an annular drilling tool and a feed control motor for moving the annular drilling tool forward and backward with respect to a workpiece, both connected to an AC power source, and an electromagnetic base for fixing the electric drill on an object to be drilled.

Abstract: A machine tool setting device and control system are provided. The machine tool setting device sets the machine tool tip at a predetermined distance above a work piece by detecting when the machine tool tip intercepts an optical beam. The control system allows for the drilling of multi-ply work pieces wherein the multi-plies comprise different thicknesses and hardnesses. The drill bit translational velocity and rotational velocity are continuously controlled for optimization depending upon the type of material and thickness as a hole is drilled through the work piece.

Abstract: A device for the temperature-responsive adjustment of the measuring points of two relatively movable machine tool parts, the device comprising a rule mounted for limited movement on a first machine part, a scanning head mounted on the second machine part, and at least one transverse rod which is disposed for axial movement in a portion of the movable machine part that is particularly subject to being heated. The transverse rod, which extends right into the heated zones at least with its inner end portion, has its outer end connected to the rule by means of a reversing drive such that elongations of the transverse rod caused by heating are converted to a horizontal shifting movement of the rule. In an alternative embodiment, a bimetallic element performs the function of the transverse rod.

Abstract: Disclosed is an edged tool positioning device which is fixed to the quill of a machine tool for permitting the edged tool to reach a desired X- and Y-coordinate position on a workpiece and for permitting the edged tool thus put at the desired X- and Y-coordinate position to advance a desired distance in the thickness of the workpiece in the Z-direction. Every time the device is brought in contact with at least one selected side and upper surface of the workpiece, a warning unit built in the device informs a worker of the contact by the device with the workpiece, thus permitting him to find a start position and measure a desired distance in each direction.

Abstract: An automatic countersink depth control tool and a combination of the same with an installer for fasteners having countersink heads. The tool has a nonrotatable stop (76) for limiting the depth of a countersink drilled in a fastener hole. The stop (76) is adjustably movable toward or away from a workpiece in which the countersink is to be drilled, the movement of the stop being relative to the depth of the countersink. There is a rotatable screw gear (50) having an external ring gear (54) for moving the stop in accordance with the depth of the countersink and in accordance with the height of the head of the countersink head of the fastener to be installed in the hole. There is a motor (90) having a spur gear (94) engaged with the ring gear (54) to rotate it a predetermined amount by a threaded engagement of the screw gear (50) and the stop (76). Because the stop is nonrotatable, the rotation of the threads moves the stop the desired amount.

Abstract: Bore holes are formed in opposite side walls of a part in alignment with each other by two separate cutting tools in two separate machine tools disposed on opposite sides of the part. One of the machine tools is a master and the other is a slave with the master machine tool being disposed at the position at which it is to form a bore hole in one of the opposite side walls. Then, the slave machine tool is moved so that the longitudinal axis of its spindle is in alignment with the longitudinal axis of the spindle of the master machine tool whereby the two bore holes will be aligned with each other and extend through the entire part. This alignment is accomplished by a laser on a spindle carrier of the master machine tool producing a laser beam in parallel with the longitudinal axis of the spindle of each of the spindle carriers and being received by a laser target on the spindle carrier of the slave machine tool.

Abstract: A thread cutting machine where the rate of advance of the thread cutting tool is controlled by means of a control system whereby the rotation of the tool and its rate of advance toward the workpiece are both used to control the position of the cutting tool.

Abstract: A tool abnormality detector for use with a machine tool for detecting any abnormality of a tool mounted on the tool mounting shaft. When the tool mounting shaft is in a correct position with respect to the tubular body secured to the spindle, the air pressure is kept constant. When an abnormal resistance is applied to the tool mounting shaft, the latter will lag in rotation with respect to the tubular body, so that the exhaust air passage will be blocked. A pressure sensor detects an abnormal increase in the air supply line, giving a signal for stopping the spindle of the machine tool. This prevents the tool from damage.

Abstract: An apparatus for forming openings in printed circuit boards includes a work table for supporting the printed circuit boards, and at least one drilling unit movable relative to the work table. The apparatus uses drills each having a shank, a collar fitted around the shank at a predetermined position. For holding these drills, at least one first tool holding device is provided on the work table, and at least one second tool holding device of a magazine type for containing the drills parallel to each other is removably mounted above the work table. At least one transferring device is provided to operate to push a desired drill out of the second tool holding device of the magazine type, hold the pushed-out drill and transfer the same to a position where it is aligned with the drilling unit.

Abstract: Methods and apparatus for monitoring, during machining of a workpiece (30,30'), the wear condition of a cutting tool (31,31') having its cutting portion in a structure (32,32') that is held by substantially more massive means (33,33').A dynamometer (35,35') and filter (36) measure the component of the dynamic force exerted between the tool (31,31') and the workpiece (30,30') approximately in the direction (A,A') normal to the primary cutting edge (34,34') of the tool (31,31') and to the main cutting velocity (V,V') at approximately the fundamental natural frequency of the held structure (32,32') in the same normal direction (A,A'). An accelerometer (37,37'), filter (38), and integrators (39) measure the component of vibration in the tool (31,31') approximately in the same normal direction (A,A') at approximately the same frequency.

Abstract: In the apparatus a cross-feed head is supported at a rotatable spindle. A cross-feed slide of the cross-feed head is arranged to be displaceable by means of a displacement drive and a displacement mechanism in a cross-feed displacement direction. The rotatable spindle is arranged on a carriage for displacement in a carriage displacement direction transversely with respect to the spindle. Furthermore, a numerical control is provided. In order to be able to adjust the radial position of the cross-feed slide with greater precision a sensor or feeler is fixedly arranged together with the displacement drive at one end of the carriage displacement travel path. An adjusting control or device controls the displacement of the cross-feed slide in conjunction with the sensor and with the displacement drive.

Abstract: To provide for, selectively, control of the speed of a tool, such as a drill or boring tool coupled to an electric drill or boring machine motor, independently of the setting of a multi-speed transmission, speed of the tool is sensed by a contactless transducer (4, 7), one part of which is coupled to the chuck (1, 2) and the other to the housing (H) of the tool, to provide speed signals which incorporate the transmission ratio of the gear (G, 66). Speed control, for example under a command signal (40; 50), then will control the actual speed, regardless of the transmission setting, with the torque deliverable by the motor being controlled by the selected gear. The diameter of the drill or other tool bit is sensed also by the transducer, if coupled to the chuck jaws, to vary the output signal from the transducer as a function of chuck jaw diameter.

Abstract: A drill press having a safety device for reducing the power to the motor when a drill bit becomes stuck, and a switch for temporarily overriding the safety device, when the latter is triggered by the drill bit becoming stuck, to temporarily increase the power to the motor for freeing the stuck drill bit. The switch has an actuating member, preferably a push-button, located at the end of the control lever whereby the operator can actuate the switch without letting go of the control lever. The front of the drill press preferably has a control panel with input and operating keys.

Abstract: An adaptive control system for a machine tool or the like includes two pairs of thrust sensors for measuring radial and axial spindle deflection and a temperature sensor for measuring spindle bearing temperature. Data processing apparatus, typically comprised of a microcomputer, is coupled to the thrust and temperature sensors and regulates the spindle bearing preload and spindle axis feed rate in accordance with the radial and axial spindle thrust. The microcomputer simultaneously regulates the percentage of oil in the oil/air mixture lubrication mist sprayed on bearing contact surfaces in accordance with bearing temperature, thereby assuring optimum machine tool performance.

Abstract: An electrical device for controlling the stroke length of a reciprocating tool carrier of a honing machine by controlling the stroke reversal points of the carrier includes a first compensating circuit for correcting deviations from a predetermined lower reversal point and a second compensating circuit for correcting deviations from a predetermined upper reversal point, the compensating circuits supplying respective reversal point signals to a comparator for comparison with a voltage representing the instantaneous position of the carrier along a stroke path.

Abstract: An automatic fault detection system for use with machine tools to detect the breakage or absence of the tool, the presence and/or absence of a portion of the workpiece, and to prevent the normal cycle of operation of the machine when such condition exists, includes a sensor having a rod, a power port and a pair of pressure sensing ports. First and second pressure sensing switches are connected to the sensing ports wherein the failure of the sensor rod to fully retract or to advance before or beyond good check stroke position respectively exhausts the pressure sensing switches preventing operation of the machine cycle.

Abstract: The present relates to machine tools, such as hond drills and more particularly to control devices utilized for controlling the speed of the machine tool.

Abstract: A contact detecting apparatus for detecting the contact of a workpiece with a tool in a machine tool which includes a magnetic coil mounted on the periphery of a spindle head and connected to an AC power source for generating an induced current in a looped secondary circuit including the workpiece, a work table, a machine body, a spindle head, a tool spindle and the tool, when the workpiece and the tool are moved relatively into contact with each other. A first conductive wire forming a secondary winding of one turn is arranged in a parallel relationship with the looped secondary circuit and a current induced therein by energization of the magnetic coil. A second conductive wire is connected at one end thereof to the looped secondary circuit. A detecting device is connected to the first and second conductive wires for detecting contact between the workpiece and the tool based on the voltage induced across the first and second conductive wires.

Abstract: A tool position offsetting system for a spare tool, including a tool life detecting device provided for detecting a broken or substantially worn tool and for replacing the same by a spare tool, and a detecting device which detects whether the spare tool is inserted in the tool spindle. If the detecting device makes a detection, an input controlling circuit applies several signals to a numerical controller so as to instruct the same to introduce the dimensional data for the spare tool into the memory of the numerical controller, resulting in amending the offset data stored in the memory before a machining operation. After the machining operation, the input controlling circuit applies several signals so as to remove the dimensional data from the memory, resulting in restoring the tool offset data to its original setting.

Abstract: On a work machine such as a milling machine having a main spindle for chucking a tool and a mobile transfer arm assembly for replacing the tool under control by a numerical control device, a chucking repeat controller including a chucking repeat fixer, which is given in the form of either a counter or a time-limit timer, automatically repeats chucking operation by the main spindle upon detection of any failure in chucking operation, and intercepts all further operation of the main spindle and the transfer arm assembly for maintenance purposes when failure in the chucking operation has been repeated in succession for prescribed number of times, preferably with concurrent generation of some visible and/or audible alarm for operators' attention.