Abstract: An NC vertical spindle jig grinder comprises a bed having a column with vertical ways and a compound table carrying the workpiece and a wheel dresser. The compound table is movable along the X and Y axes. A slide having a lay-shaft is traversable upon the vertical ways of the column along the Z axis. The slide has circular ways for supporting a cradle traversable along a circular coordinate axis B with respect to the axis of the lay-shaft. The cradle carries a turret indexable about its axis, the turret having at least two wheelheads provided with wheel spindles rotatable about the longitudinal axis of the wheelhead, the spindles spherical abrasive tools of different diameters. The grinder also comprises an NC system electrically connected to various movable assemblies of the grinder.

Abstract: A machine for automatically grinding a helical gear. The machine comprises a first rotational drive source for rotating a grinding wheel, a second rotational drive source for rotating a helical gear in mesh with the grinding wheel, a third rotational drive source for displacing the helical gear and the second rotational drive source in unison. Pulse generators are operatively connected to the first and third rotational drive sources. An output signal from one of the pulse generator is subtracted from an output signal from the other pulse generator to produce differential pulses which serve as drive pulses for the second rotational drive source.

Abstract: A feed control apparatus for a numerically controlled grinding machine having a work table movable in a first axis direction, a wheel head provided thereon with a grinding wheel of the angular type and movable in a second axis direction perpendicular to the first axis, wherein the feed control apparatus comprises a memory for storing an instruction for effecting relative movement between the work table and the wheel head, and command data indicative of a movement amount of the wheel head in the second axis direction, a computer for reading out the stored instruction and command data to calculate a movement amount of the work table on a basis of the read out command data and for producing first and second output signals respectively indicative of the movement amount of the wheel head and the calculated movement amount of the work table, and a feed mechanism responsive to the output signals from the computer for effecting the relative movement between the work table and the wheel head to move the grinding wheel

Abstract: An orbital barrel finishing machine employs rotatable drums which are removable from the machine. A coupling member mounting a plurality of angularly spaced axially extending pins engages slots of a second coupling member to provide a rotational drive engagement for the removable drums. The drums are uncoupled from the drive engagement by axially displacing the drums. A releasable latch assembly is employed to secure the drums in the coupled drive position. The orbital barrel finishing machine is employed as a component of an integrated automatic finishing system wherein the rotatable drums may be automatically removed from the machine, unloaded, loaded and returned to the machine.

Abstract: The machine described comprises a rotary drum (13) provided with an opening (23) blocked by a door (24). Said door comprises locking means and the machine is equipped with an automatic locking-unlocking device (26) to automatically lock the door (24) on the drum (13) or to unlock and raise it to clear the opening (23) of the drum. This machine further comprises means (17) for loading the drum and mechanical drive means for the drum (13).

Abstract: A low cost apparatus and method for centering a grinding and cutting apparatus on the face of the spigot or a bell of a reinforced or non-reinforced concrete pipe, manhole riser, or the like. It is mechanical to avoid the expense and uncertainty of hydraulic sensing systems. The four contact guides, one in each quadrant, are each mounted at the lower portion of one of four guide arms, each centrally pivoted to the rotatable support of the machine and each having an upper portion above the pivot connected by an elongated link to one of a pair of rotatable pivot plates. Hydraulic pistons and cylinders maintain a yieldable resistance to turning of the pivot plates.

Abstract: The ammunition container is subdivided by partition walls into individual compartments. Such containers must be structured in such a manner that a cartridge belt can be easily laterally withdrawn from the container at the top thereof. For this purpose there are provided partition walls which are formed by a stationary rigid partition wall portion and a pivotable spring-type or resilient partition wall portion. The two partition wall portions are interconnected by a resilient member, such as a spring plate or leaf. Furthermore, the distance between the spring plates or leaves and the base member or floor of the container continually increases from one partition wall to the next-following partition wall in the direction towards the discharge or outlet opening of the ammunition container.

Abstract: An improvement to a drill bit sharpening apparatus in the form of a simple spacer that provides the space setting between a drill bit point and the surface of a grinding device. The spacer comprises an elongated strip made of hard material; the width of the strip is not uniform and diminishes at two portions of the strip. The slanting angle of the portions corresponds to the Z-distances travelled by a drill bit supporting member so as to accomplish the setting. The strip also has calibration marks on its surface corresponding to a set of drill bit diameters for a given point angle. The spacer completely replaces the disc shaped and rectangular shaped prior art spacers.

Abstract: A grinding machine wherein a column supports a vertically movable holder for the spindle of a grinding wheel and the dressing apparatus is mounted on the holder. The dressing apparatus has a carriage disposed at a level above the grinding wheel and movable up and down radially of the grinding wheel. The carriage has a forward extension for a follower which supports a pivotable carrier for two parallel or nearly parallel spindles each of which carries one or more dressing tools. The carrier is pivotable relative to the follower between a first position in which the first dressing tool is ready to treat the working surface of the grinding wheel and a second position in which the second dressing tool is ready to treat the working surface. Separate motors are provided to move the follower along the carriage, to move the carriage along the holder, to drive the spindles for the dressing tools, as well as to pivot the carrier relative to the follower.

Abstract: A numerically controlled profile grinding machine has a bed for a first carriage which supports an upright column and is reciprocable along a first horizontal path. The column supports a second carriage which is reciprocable thereon along a vertical second path and supports a turntable which is indexible about a horizontal axis. The turntable supports one or more work clamping devices which are indexible about second axes extending at right angles to and intersecting the first axis. The base further supports a carriage for one or more tool supporting units each of which is movable along a second horizontal path at right angles to the first path and has a turntable indexible about a vertical axis and supporting one or more spindles for grinding wheels as well as a dressing apparatus for grinding wheels. Alternatively, each tool supporting unit can be mounted on a discrete carriage.

Abstract: The incremental very accurate positioning device is operable to control accurate positioning of a movable member such as a tool. The apparatus comprises a base with a mounting bar spaced from the base for mounting the member. The bar is movable along its elongate axis by a drive force applied to the proximal end thereof for moving the distal end forwardly and rearwardly along the axis. The bar is mounted on two parallel spaced elongated flat springs that extend transversely of the bar. The springs are fixed to the bar for maintaining an axial force on the bar and are mounted at each end to a block which is pivotally mounted on the base.

Abstract: A method and apparatus for grinding a metal need of an air jet loom for reducing the air resistance in a weft guide path of profiled reed blades.

Abstract: A table mechanism comprising two hydrostatically coupled tables, a main table and an auxiliary table, in which after clamping the main table, the gaps in the hydrostatically coupling portions of the tables are adjusted so as to position the auxiliary table precisely.

Abstract: The wear of a rotary finishing wheel operating against a continuously advancing work piece causes reduction in force of the wheel against the work piece. Wheel drive motor current is measured and the wheel is advanced toward the work piece to maintain substantially constant current. Wear of the rotary finishing wheel also reduces the surface speed of the wheel on the work piece. The wheel radius is measured and the wheel shaft speed is increased to maintain substantially constant surface speed. Such apparatus is suitable both for vertical and horizontal adjustment of the rotary finishing wheel with respect to a continuously horizontally advanced work piece.

Abstract: A cylindrical grinding process is controlled by measuring the precession of lobes about the grinding wheel and the workpiece and employing the measured lobe precessions to determine an exponential chatter growth index, which is a measure of the rate of growth of chatter and, accordingly, of the stability of the process. The wheel and workpiece rotational speeds are controlled to minimize the growth of chatter and to optimize the process.

Abstract: In dressing a grinding wheel having a non-cylindrical contour, the wheel is moved in a path corresponding substantially to the desired wheel contour by first and second CNC controlled slides while a single point diamond or diamond roll dresser is rotated by a CNC controlled rotary mechanism through selected angles during traversal of the wheel therepast to maintain a vertical reference plane containing the centerline or mid-plane of the diamond dresser point or radius substantially orthogonal to a vertical reference plane containing a tangent to the wheel contour path. Maintenance of the orthogonal relationship between the single point diamond dresser point or radius and wheel contour path during traversal results in the desired wheel contour being accurately dressed.

Abstract: A stone cutting device including a continuous flexible cutting belt for cutting a slot in stone which is in the ground. The device includes a main frame, a jib pivotally mounted to the main frame, aligned sheaves rotatably mounted to the main frame and jib, a continuous flexible cutting belt extending around and in driven engagement by the sheaves, and a means to rotate at least one of the sheaves. The continuous flexible cutting belt includes a plurality of spaced apart abrasive cutting elements extending across the top and sides of the belt. The cutting elements are flush with the remainder of the top and side surfaces of the belt which includes a molded-in-place resilient material. Belt strength is provided by a flexible cable extending through the length of the belt.

Abstract: A grinding robot of playback system to grind 3-D curved surface is disclosed which is comprised of No. 1 arm being horizontally oscillatable around a vertical axis, No. 2 arm pivoted horizontally oscillatable to the head of said No. 1 arm, fluid cylinder attached vertically to the head of said No. 2 arm, abrasive tool attached freely ascendable/descendable and turnable to the bottom of said fluid cylinder, workpiece-fixing table arranged freely turnable and inclineable from horizontal to vertical below said abrasive tool, and designed to make it possible to trace the 3-D curved-surface profile by constantly pressing down the workpiece perpendicularly toward the same by the action of said fluid cylinder and to perform the 3-D curved-surface's automatic grinding-work with the use of 2-D positional data and also to playback-control a retirement locus of the abrasive tool when retiring it temporarily from work area.

Abstract: A magnetic attraction system grinding method and apparatus comprised of arranging a magnetic circuit forming means between an abrasive tool and a workpiece, thereby generating a grinding pressure required to grind the surface of the workpiece, and performing the operation of the abrasive tool through a rectilinearly reciprocating movement or rotary movement working along the workpiece surface during the application of grinding pressure while controlling either grinding speed or grinding stroke. The magnetic circuit is produced with an electromagnet or permanent magnet assembly and the abrasive tool may be a magnetic material bonded grindstone.

Abstract: A control system for precision machine tools and similar devices provides a precise position during active operations on a table supported workpiece or part. The present system provides a support table on which a machine part or specimen is mounted that is controlled in its position through a friction free spring type hinge relative to a base, and which is held therein with a piezoelectric actuator operated in an active closed loop system to maintain a set position without any backlash.