Abstract: An interconnection system for an electronic biological waveform simulator device utilized for testing the operability of a biological waveform sensing machine such as a vectorcardiogram machine. The system includes a housing with a major surface and a circuit board within the housing containing electrical circuitry for generating output signals simulating a biological waveform. A plate affixed to the major surface of the housing includes an undercut slot adapted to receive a disc-shaped electrode commonly used with the sensing machine. A connector disposed in the slot electrically connects the electrode, when engaged in the slot, with the circuitry. Preferably, the system includes a second connector projecting from an upper surface of the plate for receiving jacks utilized with disposable electrodes. In the preferred embodiment, the first and second connectors are electrically connected together so as to provide alternate signal paths for the simulated waveform from the electrical circuitry.

Abstract: A remote metering system for monitoring, collecting, analyzing, transmitting and displaying data generated by a plurality of metering devices. A controller, preferably a microprocessor, stores the continually up-dated data, analyzes it, and initiates transmission of the data to at least one remote data receiving device. The data transmission from the controller is in serial format and includes a plurality of different channels, with at least one channel corresponding to a combination of selected data associated with different metering devices. A scaling factor can be applied to particular metering data prior to transmission, for example, so as to provide cost analyses. The remote data receiving device includes the capability of receiving and displaying data corresponding to any of the output data transmission channels from the controller.

Abstract: Improved excitation circuitry for a variable reluctance transducer is disclosed which includes a transformer having a primary winding and a secondary winding. Power circuitry coupled to the primary winding induces an AC excitation signal in the secondary winding which is coupled to the transducer. An error detection circuit compares a reference signal with the excitation signal and feeds back an error signal to the power circuitry to compensate for any differences therebetween. In such manner, a constant excitation signal is maintained for the transducer.

Abstract: A general purpose, microprocessor-based printer utilizing a thermal printhead graphic dot matrix features the capability of accepting either digital or analog data from a host system or device and or printing in either data logging, textual, or strip chart recorder format. In addition to preprogrammed alphanumeric character sets, the printer controller can print any symbol or shape adaptable to a dot matrix that may be specified by data transmitted from the host system. An analog input section of the printer is provided for applications where the host input data values to be graphed are not available in digital form. The analog input section further includes selectable chart paper speed settings, a chart input range selector, zero positioner, and a visual low paper indicator.

Abstract: Apparatus is disclosed for converting input step and direction commands from an external control source into stator winding drive current signals for a permanent magnet stepper motor. A translator circuit, having inputs coupled to the external control, generates sequential stator winding pulse enabling signals for transmission to a chopper-controlled power drive circuit. The chopper control features the sharing of a single chopper power switch by pairs of stator windings. The power drive circuit provides a winding current path to a reverse voltage supply upon initiation of winding current turn-off to enhance switching speed. A dual level current reference is generated in a current regulator circuit and compared with instantaneous stator winding currents to control the conduction states of the chopper power switches. Dual reference levels are established for idle versus accelerating or decelerating motor states, respectively.

Abstract: An adjustable boring tool including an axial shank and a socket for mounting a cylindrical boring bar with an offset axis clamped in adjustable position through transverse and longitudinally slotted segments on one side of the socket together with a transverse screw for clamping the slotted segments against the boring bar. A graduated dial fixed to the boring bar provides calibrated adjustment over a range equal to four times the offset.

Abstract: A method and apparatus for monitoring tool wear and breakage as a function of the electrical power dissipated by a machine tool which is carrying out subsequent cuts for removing stock. Optimal tool life is achieved by monitoring tool wear and breakage as a function of the power dissipated by a machine tool by monitoring said power, storing pertinent selected values thereof associated with successive cuts of the tool and periodically comparing the stored values with one another to determine if the difference therebetween exceeds a predetermined limit value, in which case the operator is warned and/or the machine tool is de-energized. The analysis phase can be carried out by a general-purpose microprocessor or discrete digital or analog components.

Abstract: Apparatus for simulating waveforms utilized to check the operability of a remote display device. The apparatus includes a waveform generator for providing electrical signals representing simulated waveforms. An interface circuit for coupling the waveforms to the remote display device includes a bridge network having a plurality of resistive legs in which a variable resistance element is provided in one of the legs. The variable resistance element is coupled to the waveform generator. An excitation signal from the remote display device is coupled to an input of the bridge. The electrical signals from the generator causes the resistance of the variable resistance element to correspondingly vary and provide simulated waveforms at the output of the bridge network to the remote display device.

Abstract: An electronic circuit for generating complex time-varying analog signal waveforms such as electrocardiogram and blood pressure transducer signals employs analog signal shaping circuits coupled to a summing network to shape the sequential output stage signals of a multiple stage counter and also employs an interface to couple the signal waveforms to external display devices.

Abstract: A part sizing system in which the upper and lower tolerance limits are illuminated on the same bar graph display. Electrical representations of the upper and lower tolerance limits are alternately coupled to the bar graph display so as to superimpose visual indications of both limits on one another, with each limit being distinguishable from each other by different light intensities. In one embodiment this bar graph display is disposed adjacent another bar graph display in the same housing. The other bar graph display is utilized to provide a visual indication of the output of at least one variable reluctance transducer which measures the size of the part under test. Improved transducer excitation circuitry is also provided for insuring accurate measurements.

Abstract: A face milling cutter having indexable inserts located in corner pockets at the periphery of the cutting face of the cutter body angularly positioned to provide a cutting edge extending from a point of maximum cutting depth in a direction progressively outward from the axis of rotation, progressively backward relative to direction of rotation and of progressively reduced cutting depth totalling a minor fraction of the outward extension, together with a secondary wiping cutting edge extending from the cutting point inwardly and backwardly relative to the axis and direction of rotation and substantially in the cutting plane of rotation thus providing effective cutting and wiping action in angularly related cutting edges of the same insert.

Abstract: An indexable insert drill employing a plurality of inserts located substantially in a single radial plane characterized by a round innermost insert having its arcuate cutting edge extending across the axial center line of the drill. One or more supplemental inserts, preferably square in configuration and including chip interruption notches positioned for positive axial lead, continue the cutting action radially beyond the arcuate center cut of the round insert with an outermost corner adapted to finish cut the side wall diameter of the hole.

Abstract: An electronic apparatus for automatically zeroing or nulling an analog offset voltage by using multiple bit successive approximation to generate an analog zeroing voltage of equal magnitude and opposite polarity to that of the offset voltage, and then summing the zeroing voltage with the offset voltage.

Abstract: Method and apparatus for controlling the operation of a grinding machine of the type comprising a circular grinding wheel adapted to rotate about its axis and a spindle adapted to hold a workpiece at a position radially spaced from the grinding wheel. The grinding machine includes slide means for advancing the grinding wheel into the workpiece, such means being powered by a threaded shaft and boss arrangement, and "jump-on" gauge means for measuring the diameter of the workpiece and providing an electrical output signal which is used to control feedrate. Feedrate is determined by a microprocessor which is connected to receive the gauge signal and to produce a feed program which will produce a given final diameter in a given time.

Abstract: An indexable insert drill with a parallelogram shaped insert positioned at a negative axial lead, the insert having a slanted recess which provides an angularly oriented cutting edge extending from a face cutting corner through or slightly under and substantially beyond the drill axis, and a unique notch in the cutting edge providing chip interruption and stabilized lead.

Abstract: A multiple probe gage system wherein the analog output signal of a plurality of probes is successively sampled, digitized and stored. The stored information is then digitally processed by a microprocessor to produce a digital signal which is a function of the analog output signals of selected probes.

Abstract: A high power source load simulator presents itself to a power meter as a conventional electrical load, but in fact is highly portable and dissipates relatively little power and heat. A current source generates a selectively variable current signal which is characterized by a relatively low, constant voltage. A voltage source generates a selectively variable voltage signal which is phase locked with the current signal and is characterized by a relatively low, constant current. The phase angle between the two signals is selectively variable by means of a phase shift network interposed mediate the voltage and current sources. The current and voltage signals are impressed upon the current and voltage sensing inputs of a power monitor via jumper cables. An AGC circuit is also interposed between the voltage and current sources to insure the amplitude independence of their respective signals.

Abstract: An indexable insert drill employing a pair of radially opposed inserts having either positive or negative axial lead cutting edges extending in the same cone of revolution. One of the inserts has a radially inner arcuate corner intersecting and extending across the axial center line. The other insert is located relatively overlapping but outward radially with an outermost corner adapted to finish cut the side wall diameter of the hole. Insert cutting edges provide for chip interruption and breakage.

Abstract: A cutting insert of hard wear resistant material such as sintered tungsten carbide having a raised negative rake cutting land forming an obtuse cutting edge angle with side walls extending normal to the cutting face. A gradual sloping surface from the inner margin of the raised cutting land provides strength compatible with downward chip flow to meet the internal substantially flat face of the insert. In a preferred embodiment a center island is provided extending to the top level of the raised cutting land which permits relatively lighter starting feeds and greater range of feed rates.

Abstract: A sizing gage for use with an LVDT probe for producing an output signal representing the deviation of part dimension from a nominally ideal dimension, and a columnar display means comprising vertically arranged light emitting diodes for indicating the degree and sense; i.e., oversize or undersize, of part size deviation according to which of the emitting diodes is lighted. The probe output is an ac signal of polarity representing the degree of deviation. The probe output signal is converted to a dc voltage the amplitude and polarity of which is representative of part size deviation. The dc signal is used as a comparison base against a precision triangle wave signal to generate a squarewave the transitions of which occur at points in time related to the amplitude and polarity of the dc signal. This squarewave is compared to a reference squarewave of fixed transition time to produce a window pulse the width of which is representative of the degree of part size deviation.