Abstract:
A pure-rolling generating measurement method and device for gear helix artifact is proposed, which use a dividing table to accurately control the linear rail slide block assembly component to rotate according to the helix angle of different base circle. The height of the measuring point is the installation height of the working plane of generating rails, so as to ensure that the measuring point is always located on the dividing cylindrical surface of the gear helix artifact. When the gear helix artifact does pure-rolling motion, the slide block performs high-precision linear motion on the working surface of two fixed rails; the pure-rolling motion is proportional to the high-precision linear motion, so that the inductor micro-displacement probe can complete the measurement of the helix deviations of the gear helix artifact with different base circle helix angle.
Abstract:
A measuring and sensing head (6, 30, 50) is moved under computer control in engagement with right and left flanks of gears. These may be internal or external gears. The head is moved in a tangential direction with respect to the base circle of the gear and, in accordance with the invention, additionally in a radial direction with respect to the axis (3) of the gear (2), in such a manner that, when setting right and left flanks, respectively, of a gear tooth, the paths of the measuring and sensing head form straight lines which intersect at intersection points (43, 53) outside of the base circle (32, 52) of the gear. The movement of the sensing head is controlled by a computer (C) in accordance with an involute mathematical function following the involute curve of gear teeth. Other curves, similar to an involute curve, may be controlled by the computer. The range of movement in tangential direction with respect to the gear is thereby substantially reduced and interference of the measuring or sensing head with an edge of the tooth is prevented.
Abstract:
An apparatus tests rack teeth of a rack member for a rack and pinion vehicle steering gear. The apparatus comprises a support for mounting the rack member for longitudinal displacement and a helically toothed test pinion member having an axis. A carriage mounts the test pinion member for rotation about its axis and in driving engagement with the rack member. A resilient biasing spring urges the test pinion member into engagement with the rack member and provides a predetermined lateral spacing between the longitudinal axis of the rack member and the axis of the test pinion member. A screw adjusts the biasing force of the resilient biasing spring at the predetermined lateral spacing. A drive effects displacement of one of the rack and test pinion members to impart displacement to the other of the rack and test pinion members. A first sensing device senses the displacement of one of the rack and test pinion members which results from successive and predetermined unit displacement of the other of the rack and test pinion members. A second sensing device senses a variation from the predetermined lateral spacing between the axes of the rack and test pinion members which is caused by the unit displacements.
Abstract:
The measuring system of a gear measuring feeler in a gear measuring or testing machine comprises two oppositely arranged permanent magnets mounted at an end of a feeler rod located opposite to its end provided with a feeler probe. The measuring system further comprises a Hall-effect generator or sensor fixedly connected to a housing and arranged between the two permanent magnets and spaced therefrom. The Hall-effect generator or sensor is connected to a stationary electronic circuit containing a null point or zero compensation circuit and operational amplifiers. The measuring system supplies an output signal free of any residual or remaining carrier signal and having an extended frequency response range of up to 100 kHz. The output impedance of the measuring system is low and amounts to approximately 1 ohm. The zero point and the amplification or gain can be electrically adjusted without a change in the output impedance. The measuring system has a substantially simpler structure than known inductive measuring systems, consists of a substantially smaller number of individual members, enables a longer measuring path and provides a greater run-out distance after the feeler rod has been moved into contact with a stop.
Abstract:
The profile measurement control comprises a potentiometer adjustable by means of a lever. The voltage tapped-off the potentiometer is attenuated via a resistance network proportional to the radius of the base circle disc and additionally via an encoding switch and a voltage attenuating circuit when a certain pre-selected diagram length transmission or translation is exceeded. Thus a voltage is always supplied to the drive motor driving a generating carriage or slide which ensures for an optimum paper feed rate when the lever is located to engage a stop. Hence, the lever can be always adjusted to engage the stop without the preselected diagram length translation or the radius of the selected base circle disc having to be taken into account. Consequently, the measuring rate during series testing of gear profiles can be considerably increased.
Abstract:
A method of measuring errors in the rotational truth of gear teeth of a gear by means of a measuring device having a feeler guide which is pivotable about a pivot axis parallel to the gear axis, the feeler guide guiding a feeler which is prebiased in the direction of the gear and cyclically engages into the gear teeth as the gear rotates. The feeler together with the feeler guide is pivotable about its pivot axis and can be displaced back in relation to the feeler guide. An electronic circuit determines the largest degree of rearward displacement of the feeler during each measuring cycle in that it stores signals delivered by the feeler and compares such stored signals with one another. During each measuring cycle there is formed from a number of signals delivered by the feeler as well as from a number of subsequently delivered signals a respective mean value. Both mean values are compared with one another, the larger of such mean values, to the extent that it constitutes the mean value of the later signals is stored, and this procedure is repeated for such length of time until there is present a mean value which is smaller than the directly previously formed mean value, whereupon such previously formed mean value is delivered as the maximum value of the related measuring cycle.
Abstract:
A method of determining the boundaries of a measuring path of a tooth flank-testing apparatus, wherein a measuring feeler is arranged upon a cross-slide arrangement composed of an X-slide or carriage movable in the direction of the tooth width of a test piece and a Y-slide or carriage movable in the direction of the tooth height. Each carriage has associated therewith a X-drive and Y-drive containing X-servomotor and Y-servomotor, respectively, X- and Y-position transmitter and X- and Y-position regulator. Both drives can be selectively manually controlled or by a program-controlled computer, which processes apart from signals of the position transmitter also signals delivered by the measuring feeler itself in accordance with the deflection of its measuring head and interrupts the course of the program when the deflection exceeds a predetermined value. Connected with the computer is a memory or storage for the position data of a tooth addendum point and a tooth root or base point as boundaries of the measuring path of the feeler head which moves through a random number of tooth flanks. The feeler head is moved at the tooth addendum point and tooth base point, respectively, and the position data obtained by the measuring feeler is stored. The feeler head is moved at a random location between and in spaced relationship from two tooth flanks of the test piece, then the X-position regulator is connected with the measuring feeler while circumventing the computer, the feeler head is brought into contact by movements of the X-carriage controlled by the measuring feeler at random locations of one of these tooth flanks, and thus, deflected by the predetermined value, and the feeler head then is moved, by manually controlling the Y-slide while the X-slide is controlled itself by the measuring feeler, along the tooth flank to the tooth addendum point and/or the tooth base point.
Abstract:
Gear testing apparatus has a tooth flank probe or feeler displaceable in a spatial co-ordinate system by being mounted on a series of three support members each movable in a different direction. Scales monitoring the member movements feed member position data to a computer in which a movement programme is stored. In one arrangement, the computer programme controls movements of all three members and deviations in tooth flank form cause deflections of the feeler that are evaluated by the computer. In another arrangement, two of the members are driven by the programme data and the third member is displaced by biassing means to hold the feeler against a tooth flank, the computer comparing said displacements with reference values to evaluate deviations in the tooth flank form.
Abstract:
A gear tooth profile testing apparatus has a pair of displaceable measuring devices, one of which is movably mounted on an adjustable base plate and has the other device movably mounted on it. A probe mounted on said other device has biassing means urging it against the profile under test. Drive means displace one of the devices, which transmits signals of relative movements between the two devices to a computer. The computer receives from the other device signals of its movements relative to the base plate. The computer compares these measurements of probe movement with reference values to evaluate deviations in the measured profile.
Abstract:
An automation cell incorporating elements for performing secondary operations on a machined part is adapted to be disposed adjacent to a machining center for performing the primary operations on the part. The cell incorporates a robotic arm capable of being moved into position with respect to the machining center so as to load machined parts into the machining center and unload primarily machined parts for the performance of secondary operations in the cell. In a preferred embodiment the automation cell performs roll check operations on the primarily machined gear by bringing it into meshed engagement with a master gear and rotating the meshed gears and employing a sensor to monitor the roll-out of the machined gear.