Abstract: An adjustable fixture mechanism may include a first housing, an adjustment control plate, an adjustment member, and an adjustment control member. The first housing includes an adjustment aperture. The adjustment control plate is supported by the first housing and include an adjustment control aperture. The adjustment member may be disposed within the adjustment aperture and include a proximal end, a distal end and a first central axis extending through the proximal and distal ends. The adjustment control member may be disposed within the adjustment control aperture and include a proximal end and a distal end. The adjustment control member may be rotatable within the adjustment control aperture about a second central axis that is offset from the first central axis. The distal end of the adjustment control member may include a ramped surface extending about the second central axis and in contact with the proximal end of the adjustment member.

Abstract: An indexable cutting insert comprises a flank face having a generally parallelogram shape and a plurality of side faces. The flank face is bounded by a plurality of edges. Each edge joins the flank face with one of the side faces. The plurality of edges comprises a first cutting edge and a second cutting edge. The first cutting edge has a shape corresponding to a portion of a first bent curve and the second cutting edge has a shape corresponding to a portion of a second bent curve. The second bent curve is obtainable by a translation of the first bent curve along a width direction of the cutting insert The cutting insert has a two-fold rotational symmetry with respect to an axis of symmetry that is perpendicular to the width direction, a longitudinal direction of the cutting insert being perpendicular to the width direction and the axis of symmetry.

Abstract: A spiral cutting device includes a blade, a blade driving shaft, a guiding device, a driving device, and a controller. The blade is for processing a roller. The blade driving shaft drives the blade to move toward the roller. The guiding device moves in a guiding direction perpendicular to a moving direction of the blade. The driving device is movably supported on the guiding device and rotates the roller. The controller controls a feeding amount of the blade, a moving speed of the driving device, and a rotate speed of the roller to spirally cut the roller. When an outer surface of the roller is unfolded to a plane, the blade path of the blade is in sinusoidal shape or in cosinusoidal shape.

Abstract: A machine tool having a monolithic base is disclosed. The monolithic base includes at least two flat surfaces that are mutually orthogonal and that are convex with respect to each other. The machine tool includes at least two moveable stages, each mounted to one of the flat surfaces, and each stage also being mutually orthogonal.

Abstract: A steady rest has a body juxtposable with a workpiece rotatable about a workpiece axis. Two arm elements are pivoted on the body and carry outer rollers radially engageable with the workpiece. A center element shiftable on the body in a straight line generally radially of the axis carries a center roller engageable radially with the workpiece. The rollers are angularly spaced about the workpiece. An electric actuator mounted on the body is connected by a transmission to the elements for displacing the respective roller radially relative to the workpiece.

Abstract: A steady rest for centering a rotationally symmetrical workpiece in a housing, a guide slide axially adjustable in the housing, an actuator rod in a form-locking connection with the guide slide, and two control surfaces opposite one-another on the guide slide and configured so that the guide slide has a triangular cross-sectional contour, one tip pointing towards the workpiece and the opposite two tips point in toward the actuator rod, a middle steady rest arm in driving connection with the actuator rod, and two outer steady rest arms each on a side next to the middle steady rest arm, and mounted in a swivelling arrangement in the housing, the first free end of which is in contact with a control surface of the guide slide, the second free end gripping the workpiece, forming a three-point mounting with the middle steady rest arm adapted to hold the workpiece.

Abstract: Processes for high speed machining of workpiece materials using high performance tools with prolonged tool life and improved surface finish are provided by vibrating the tool and/or the workpiece at a frequency greater than the frequency of shear localization in the primary shear zone or chip segmentation occurring in the absence of tool vibration, with an amplitude sufficient to break up the tool-chip atomic contact, thereby decreasing the tool-chip contact length through decreasing the tool-chip contact time, thereby suppressing accelerated chemical tool wear caused by dissolution of the tool into the workpiece by nanocrystalline grain boundary diffusion and grain boundary sliding mechanisms by preventing shear localization associated with nanocrystalline grain formation in the primary shear zone of the chip, and suppressing oxidation wear of the tool by preventing segmentation of the chip.

Abstract: There is provided a roll surface machining method and apparatus for using a cutting tool to carry out ultra-precision machining in the surface of a roll with a reduced amount of data. The apparatus and method for roll surface machining includes setting a machining start position of a cutting tool with respect to the surface of the roll by C-axis indexing of the roll and positioning of the roll in the axial direction (Z-axis direction) both with respect to the cutting tool. Also the cutting tool and the roll are moved relative to each other in the axial direction of the roll by position control using C-Z axis interpolation, thereby forming a three-dimensional pattern in the surface of the roll.

Abstract: A steady rest for clamping of rod-shaped workpieces, the steady rest including three holding elements, including two outer holding elements adapted to be swivelled about a pin mounted in a housing and a middle holding element adapted to be adjusted axially, and in which coolant or lubricant can be carried to a workpiece by means of ducts in the housing and the middle holding element. The ducts provided in the housing and in the middle holding element, being connected to a cavity and the ducts being connected together by a deformable flexible high-pressure hose. The ducts being connected together by means of the elastically deformable element.

Abstract: A chuck device for a machine tool includes: a center unit disposed in an axial hole in a tubular housing, extending along a hole axis of, and having a tip extending outwardly of the housing and abutting against a workpiece; a chuck unit disposed movably in the axial hole, sleeved on the center unit and including a chuck member disposed adjacent to the tip of the center unit; and a sleeve unit disposed movably in the axial hole, concentric with the housing and sleeved on the chuck unit. The sleeve unit has a pushing end portion sleeved on and abutting against the chuck member, and is operable to move relative to the housing along the hole axis such that the chuck member is driven by the pushing end portion of the sleeve unit with movement of the sleeve unit to move away from the housing and to clamp the workpiece.

Abstract: This is a tool device called a Special Articulating Tool Holder for a Lathe. The device provides a new and unique device to permit deep hollowing of wood or other materials with a controlled, repeatable method. The preferred embodiment of the device is comprised of multiple (two or more) articulating joints—the first of the multiple articulating joints is secured to a tool holder with features to hold cutting tools—and the last of the multiple articulating joints is secured to an essentially vertical mounting post. The mounting post is held in place by a base means which mounts either horizontally or vertically to the machine base as determined by the machine configuration.

Abstract: A machine tool a slide attached on a base and moveable along an X-axis, a carriage attached onto the slide and moveable along a Y-axis, a follower rotatably mounted on the carriage, a sliding member attached on the follower and moveable along a Z-axis, a carrier rotatably attached to the sliding member, and a tool holder mounted on the carrier and rotatable relative to the carrier to selected angular positions for supporting a shaft, and a barrel slidably received in the shaft for supporting a tool member. The barrel includes a noncircular chamber for engaging with a noncircular shank of the tool member and for preventing the shank of the tool member from rotating relative to the barrel and the shaft.

Abstract: A locking system for securing tools on an arbor. The locking system has a collar attached to the arbor, with the collar spaced from the tooling. A nut is placed over the collar and positioned next to the tools. The nut is then rotated to secure the nut between the collar and the tools.

Abstract: A micropositioner is provided, which contains an outer magnetic pole-piece and an inner magnetic pole-piece located within the outer magnetic pole piece. At least one permanent magnet is located between the inner magnetic pole piece and the outer magnetic pole-piece. At least one coil is located between the inner magnetic pole-piece and the outer magnetic pole-piece, wherein the at least one coil is capable of directing magnetic flux between the inner magnetic pole-piece and the outer magnetic pole-piece. An outer movable shell is also movably connected to the outer magnetic pole-piece.

Abstract: A cutting tool assembly having a tool post capable of lateral movement along a work piece to be cut and a shank on the tool post holding at least one machined tool tip and possibly other tool tips. The tool tip has diffractive features in contact with the work piece in order to machine macro-scale features having nano-scale features. The machined work piece can be used to make articles having diffractive features such as optical films having lenslets.

Abstract: A cutting tool assembly having a tool post capable of lateral movement along a work piece to be cut and an actuator with at least one machined tool tip and possibly other tool tips. The actuator provides for control of the movement of the tool tip in an x-direction into and out of the work piece in order to make continuous or discontinuous diffractive features in it. The machined work piece can be used to make articles having diffractive features such as optical films having lenslets.

Abstract: In a steady rest (1) with three holding elements (5, 6, 7), of which the two outer holding elements (6, 7) can be swivelled about articulated pins (8, 9) mounted in a housing (2) and the middle holding element (5) can be adjusted in a straight line, with one chip protection cap (11, 12) each provided with outlet ducts attached to one or both outer holding elements (6, 7) and with the possibility of supplying cooling or rinsing agent in a controlled fashion via ducts (13, 15) worked into the holding elements (6, 7) for application to the workpiece (10), each of the ducts (13, 15) provided in the outer holding elements (6, 7) is directly connected to a duct (27) running in the housing (2) of the steady rest (1) via kidney-shaped openings (21, 22) running concentrically to the articulated pins (8, 9).

Abstract: A high bandwidth rotary fast tool servo provides tool motion in a direction nominally parallel to the surface-normal of a workpiece at the point of contact between the cutting tool and workpiece. Three or more flexure blades having all ends fixed are used to form an axis of rotation for a swing arm that carries a cutting tool at a set radius from the axis of rotation. An actuator rotates a swing arm assembly such that a cutting tool is moved in and away from the lathe-mounted, rotating workpiece in a rapid and controlled manner in order to machine the workpiece. One or more position sensors provides rotation and position information for a swing arm to a control system. A control system commands and coordinates motion of the fast tool servo with the motion of a spindle, rotating table, cross-feed slide, and in-feed slide of a precision lathe.

Abstract: A machine tool assembly includes a high speed rotating spindle for forming extremely precise surface contours on a work piece. The spindle is supported on a spherical air bearing about its center of gravity. The spindle can be rotated through an air turbine drive system incorporated into the spherical air bearing to eliminate any undesirable moments about an axis perpendicular to the long spindle axis. The spindle is adjustable in pitch and yaw directions through the influence of X-Y actuators. The X-Y actuation system is preferably electromagnetic and provides a non-contact method of displacing the spindle shaft in a controlled manner at any speed.

Abstract: A cutting tool assembly having a tool post capable of lateral movement along a work piece to be cut and an actuator with a tool tip. The actuator provides for variable control of the movement of the tool tip in an x-direction into the work piece at two simultaneously independent speeds for use in making microstructures in the work piece.

Abstract: The present invention discloses a tool holding module, wherein a hollow fixture seat and a hollow tool rod are integrated to form a holding module. A fixture head is arranged in the front of the fixture seat and enfolded by the tool rod, whereby the tool holding module of the present invention becomes more secure and robust and can maintain the concentricity between the fixture seat and the tool rod. Therefore, the present invention can prevent a tool from vibration, damage or falling off caused by insufficient concentricity or coupling force resulting from too great a length of the tool rod and can thus increase the machining precision and service life. Besides, the prevent invention also provides various assembly interfaces for different fixture seats and tool rods.

Abstract: A high bandwidth rotary fast tool servo provides tool motion in a direction nominally parallel to the surface-normal of a workpiece at the point of contact between the cutting tool and workpiece. Three or more flexure blades having all ends fixed are used to form an axis of rotation for a swing arm that carries a cutting tool at a set radius from the axis of rotation. An actuator rotates a swing arm assembly such that a cutting tool is moved in and away from the lathe-mounted, rotating workpiece in a rapid and controlled manner in order to machine the workpiece. A pair of position sensors provides rotation and position information for a swing arm to a control system. A control system commands and coordinates motion of the fast tool servo with the motion of a spindle, rotating table, cross-feed slide, and in-feed slide of a precision lathe.

Abstract: There is provided a combined machining lathe provided with a work supporting device for preventing the occurrence of chattering at the time when a work is machined. The combined machining lathe 1 has a first main spindle 10 and a second main spindle 20 to grip the work W1. An upper tool rest 30 is provided above a centerline connecting the first main spindle 10 and the second main spindle 20, and a lower tool rest 50 is provided below the centerline. The upper tool rest 30 is changeably mounted with a milling tool T1 or the like to mill the work W1. The lower tool rest 50 has a turret tool rest 70, and is provided with the work supporting device 100 in addition to a tool. The work supporting device 100 supports the work W1 from the downside to prevent the occurrence of chattering at the time of machining.

Abstract: A cutting tool assembly having a tool post capable of lateral movement along a work piece to be cut and an actuator with a tool tip. The actuator provides for variable control of the movement of the tool tip in a z-direction laterally along the work piece, while maintaining the tool tip at a substantially constant position in an x-direction into the work piece, for use in making microstructures in the work piece.

Abstract: A cutting tool assembly having a tool post capable of lateral movement along a work piece to be cut and an actuator with a tool tip. The actuator provides for independent and variable control of the movement of the tool tip in an x-direction into the work piece and in a z-direction laterally along the work piece for use in making microstructures in the work piece.

Abstract: A highly dynamic lens processing machine with a machine bed having at least a first tool holder and one workpiece holder with an axis of rotation and including a workpiece spindle arranged thereon. The first tool holder includes at least one dynamic linear drive with a first oscillation axis which runs parallel to the axis of rotation. The workpiece holder includes at least one dynamic linear drive in the direction of a second oscillation axis which is arranged parallel to the first oscillation axis.

Abstract: A quick-setting and release tool post mechanism provides for locking of tool holders to a tool post body and incorporates a gib drive member having angulated thread flanks that impart downward and lateral forces to one or more gibs to enhance the tool holder locking activity. The tool post and tool holder each have an internal coolant supply and distribution system for supplying coolant fluid during machining. The tool post has one or more thread flank actuated tapered gibs that are actuated by manually energized rotary motion of an externally threaded gib drive member to develop thread flank induced forces that achieve locking of tool holders at selected positions on dove-tail mounts and to achieve back-lash free quick release of the tool holders from the mounts.

Abstract: A precision tool holder for precisely positioning a single point cutting tool on 4-axis lathe, such that the center of the radius of the tool nose is aligned with the B-axis of the machine tool, so as to facilitate the machining of precision meso-scale components with complex three-dimensional shapes with sub-?m accuracy on a four-axis lathe. The device is designed to fit on a commercial diamond turning machine and can adjust the cutting tool position in three orthogonal directions with sub-micrometer resolution. In particular, the tool holder adjusts the tool position using three flexure-based mechanisms, with two flexure mechanisms adjusting the lateral position of the tool to align the tool with the B-axis, and a third flexure mechanism adjusting the height of the tool. Preferably, the flexures are driven by manual micrometer adjusters. In this manner, this tool holder simplifies the process of setting a tool with sub-?m accuracy, to substantially reduce the time required to set the tool.

Abstract: A cutting tool assembly having a tool post capable of lateral movement along a work piece to be cut and an actuator with a tool tip. The actuator provides for control of the movement of the tool tip in an x-direction into and out of the work piece in order to make discontinuous microstructures in it. The machined work piece can be used to make microstructured articles such as films having non-adjacent lenslets.

Abstract: A high bandwidth rotary fast tool servo provides tool motion in a direction nominally parallel to the surface-normal of a workpiece at the point of contact between the cutting tool and workpiece. Three or more flexure blades having all ends fixed are used to form an axis of rotation for a swing arm that carries a cutting tool at a set radius from the axis of rotation. An actuator rotates a swing arm assembly such that a cutting tool is moved in and away from the lathe-mounted, rotating workpiece in a rapid and controlled manner in order to machine the workpiece. A pair of position sensors provides rotation and position information for a swing arm to a control system. A control system commands and coordinates motion of the fast tool servo with the motion of a spindle, rotating table, cross-feed slide, and in-feed slide of a precision lathe.

Abstract: An improved tool holder, such as a shave tool (20), broadly includes: an adapter plate (23) adapted to be mounted on the screw machine (21) for controlled movement toward and away from the workpiece (W); a tool block (24) slidably mounted on the adapter plate for relative movement relative thereto along a first axis (x—x); a slide body (25) mounted on the tool block for rotation relative thereto about a second axis (y—y), an adjustment mechanism (28) acting between the slide body and the tool block for controllably varying the angular position of the slide body relative to the tool block; and a head (26) slidably mounted on the slide body for movement relative thereto along a third axis (z—z). The head has a roller (22) and cutting tool (T) spaced from the roller.

Abstract: A shave tool holder for use with an automatic screw machine and for machining a rotatably driven workpiece. The tool holder includes a shank engageable with the screw machine and for providing reciprocating motion of the shave tool holder. A dovetail shaped recess is defined within a forward mounting portion of the shank and a corresponding dovetail shaped projection in an opposing surface of the body in order to engage the body with the shank in a vertically deflectable and adjustable manner. A roller is secured in vertically adjustable fashion to a forward facing location of the body. A tool post is releasably secured to the body, through aligning apertures formed in the body and the tool post, a mounting bolt inserting through the aligning apertures for securing the tool post to the body. A cutting insert is secured upon the tool post in a desired spaced relationship relative to the roller and so that the rotatably driven workpiece is adapted to being received between the roller and the insert.

Abstract: A method for controlling an automatically operated lathe provided with at least one spindle and at least one tool rest includes the following steps. First, each of a plurality of transfer position data required in a sequence of machining programs in connection with at least one spindle and at least one tool rest is provided in a form of either one of two types of transfer position data, one of which is cam-reference data directing a transfer position as a function of a cam rotation quantity and the other is time-reference data directing a transfer position as a function of an elapsed time. Next, a time-series allocation of the cam-reference data and the time-reference data is designated in the sequence of machining programs. Then, the cam-reference data and the time-reference data are processed in accordance with the time-series allocation, so as to control a relative feed motion between at least one spindle and at least one tool rest in the sequence of machining programs.

Abstract: A method for controlling an automatically operated lathe, provided with at least one spindle and at least one tool rest, includes the following steps. First, each of a plurality of transfer position data required in a sequence of machining programs in connection with at least one spindle and at least one tool rest is provided in a form of a cam-reference data directing a transfer position as a function of a cam rotation quantity. A plurality of pulse-train generating sources, each of which generates any pulse train, is also provided. Next, with regard to each of the plural transfer position data, a pulse-train generating source for generating a pulse train defining the cam rotation quantity as one component of the cam-reference data is designated, with the pulse-train generating source being selected from the plural pulse-train generating sources.

Abstract: A lathe steady rest has a frame adjacent an axis about which a lathe rotates a workpiece, a pair of arms pivotal on the frame about arm axes parallel to the workpiece axis and having outer ends radially displaceable relative to the workpiece axis, and a slide displaceable radially of the workpiece axis on the frame and having an outer end turned toward the workpiece. The outer ends are angularly spaced about the axis. Respective rollers rotatable on the outer ends about roller axes parallel to the workpiece axis radially engage the workpiece. Respective caps mounted on the arm outer ends over the respective rollers have passages with outer ends directed radially inward against the workpiece adjacent the respective rollers. A fluid is supplied under pressure to the passages to flush particles from the workpiece. The chamber allows the respective cap to change position without losing pressure in its passages.

Abstract: A lathe steady rest has a frame adjacent an axis about which a lathe rotates a workpiece, a pair of arms pivotal on the frame about arm axes parallel to the workpiece axis and having outer ends radially displaceable relative to the workpiece axis, and a slide displaceable radially of the workpiece axis on the frame and having an outer end turned toward the workpiece. The outer ends are angularly spaced about the axis. Respective rollers rotatable on the outer ends about roller axes parallel to the workpiece axis radially engage the workpiece. Respective caps mounted on the arm outer ends over the respective rollers have passages with outer ends directed radially inward against the workpiece adjacent the respective rollers. A fluid is supplied under pressure to the passages to flush particles from the workpiece. The chamber allows the respective cap to change position without losing pressure in its passages.

Abstract: A toolholder apparatus includes a head, a cutting tool mounting fixture attached to the head for holding the cutting tool, and a floating roller assembly pivotally mounted relative to the head. These components are arranged and constructed so that during the cutting of a workpiece with the cutting tool the floating roller assembly can pivot about a pivotal axis relative to the head to allow the floating roller assembly to align with the workpiece. A mechanism is also provided for accomplishing the initial adjustment of alignment of the cutting tool with the rotating workpiece. This mechanism includes a cylindrical shaft extending from the head, and having an eccentric cam follower lug extending transversely from the shaft. A mounting block has a cylindrical bore disposed therethrough, and the shaft is received through the bore of the mounting block. A cam piece is slideably disposed within the mounting block to rotate the shaft as the cam piece slides relative to the mounting block.

Abstract: A toolholder apparatus includes a head, a cutting tool mounting fixture attached to the head for holding the cutting tool, and a floating roller assembly pivotally mounted relative to the head. These components are arranged and constructed so that during the cutting of a workpiece with the cutting tool the floating roller assembly can pivot about a pivotal axis relative to the head to allow the floating roller assembly to align with the workpiece. A mechanism is also provided for accomplishing the initial adjustment of alignment of the cutting tool with the rotating workpiece. This mechanism includes a cylindrical shaft extending from the head, and having an eccentric cam follower lug extending transversely from the shaft. A mounting block has a cylindrical bore disposed therethrough, and the shaft is received through the bore of the mounting block. A cam piece is slideably disposed within the mounting block to rotate the shaft as the cam piece slides relative to the mounting block.

Abstract: A shave tool holder having a body, a platform base and a vertically extending superstructure. An elongate shank portion extends from the body and mounts the body to a holder block. The holder block is reciprocally actuated in a horizontal direction in combination with being pivotally actuated in a vertical direction. A cutter insert is releasably secured upon the platform base. A roller is mounted to a support portion which is in turn secured to the vertically extending superstructure. The roller and support portion are capable of being vertically actuated up and down along the superstructure by a bolt. The enlarged head portion includes a plurality of radially outwardly extending markings corresponding with a circumferential array of the enlarged head portion.

Abstract: A toolholder apparatus includes a head, a cutting tool mounting fixture attached to the head for holding the cutting tool, and a floating roller assembly pivotally mounted relative to the head. These components are arranged and constructed so that during the cutting of a workpiece with the cutting tool the floating roller assembly can pivot about a pivotal axis relative to the head to allow the floating roller assembly to align with the workpiece. A mechanism is also provided for accomplishing the initial adjustment of alignment of the cutting tool with the rotating workpiece. This mechanism includes a cylindrical shaft extending from the head, and having an eccentric cam follower lug extending transversely from the shaft. A mounting block has a cylindrical bore disposed therethrough, and the shaft is received through the bore of the mounting block. A cam piece is slideably disposed within the mounting block to rotate the shaft as the cam piece slides relative to the mounting block.

Abstract: A box turning tool for a Greenlee automatic screw machine with a conventional endworking attachment uses a conventional indexable carbide insert to produce proper cutting action on a workpiece. The box turning tool has a shank clamped in the endworking attachment. The shank has an insert seat that lies in a transverse plane that makes an angle of approximately 83 degrees with a central longitudinal plane defined by the shank. The indexable carbide insert cutting edge is mounted to the shank insert seat such that a cutting edge is inherently parallel to a horizontal plane passing through the longitudinal axis of the automatic screw machine spindle and the workpiece. The shank is adjusted in the endworking attachment to bring the carbide insert cutting edge into coincidence with the horizontal plane through the automatic screw machine longitudinal axis. The shank can be formed to locate the carbide insert such that the cutting tip thereof leads or trails the cutting edge.

Abstract: The body section of the holder carries at one side a shaving tool bit and work supporting roller, and is removably mounted at its opposite side on the slide section of the holder by a quick release pin, which is reciprocable in a bore in the slide section. A spring normally urges the inner end of the pin into an opening in the body section to prevent its removal from the slide section, but to permit limited floating movement of the body section relative to the slide section. The pin may be retracted manually to allow removal of the body section. The work supporting roller is also removably and adjustably mounted on the body section; and the slide section is adjustably supported on an adapter to be mounted thereby on a machine cross slide. Two sets of ball bearings are interposed between the body and slide sections to facilitate floating movement of the former on the latter.

Abstract: The body section of the holder carries at one side a shaving tool bit and worm supporting roller, and is removably mounted at its opposite side on the slide section of the holder by a quick release pin, which is reciprocable in a bore in the slide section. A spring normally urges the inner end of the pin into an opening in the body section to prevent its removal from the slide section, but to permit limited floating movement of the body section relative to the slide section. The pin may be retracted manually to allow removal of the body section. The work supporting roller is also removably and adjustably mounted on the body section; and the slide section is adjustably supported on an adapter to be mounted thereby on a machine cross slide. Two sets of ball bearings are interposed between the body and slide sections to facilitate floating movement of the former on the latter.

Abstract: A centering and supporting apparatus is disclosed for use as a true centering steady rest for rotatably supporting a cylindrical workpiece during a machining or grinding operation. The apparatus has an internal centerline adjustment mechanism for adjusting the steady rest so as to support the workpiece at its dynamic working centerline. At least one, or a pair of support arms are slidably mounted on an operator body in a housing. Said one or pair of support arms each carries a side workpiece contact member, and the operator body carries a center workpiece contact member, and each workpiece contact member is engagable with the perimeter of the workpiece. The operator body is moved by a stroking means to urge the center workpiece to support a workpiece.

Abstract: An automatic true centering steady rest apparatus for a rotating cylindrical workpiece during a machining or grinding operation on the workpiece. The apparatus has an integrally mounted gaging device, for continuously gaging the diameter of a workpiece during a machining or grinding operation. A pair of gripper arms are slidably mounted on an operator body in a housing. Each gripper arm and the operator body carries a workpiece contact member engageable with the perimeter of the workpiece. The gripper arms are urged to grip a workpiece by the action of a pair of rollers and two sets of fixed guide pins which are operatively engageable with camming contours contained on opposing inner surfaces of the apparatus housing. The improved efficiency of the apparatus, as a result of the roller and guide pin action allows for placing the gaging device remotely from the workpiece, without any loss in the precision of its measurement.

Abstract: A tailstock assembly for a wood-turning lathe which facilitates the drilling of deep bores into long slender wooden workpieces. The tailstock includes a chuck grasping the tail end of the workpiece, said chuck having an axial center bore therethrough providing a guide for a drill inserted therein to make the bore.

Abstract: A tool holder for a small screw machine box tool, having a uniform diameter for easy removal and a carbide insert both useable in either right or left hand box tools.

Abstract: A tool coupling for connecting a tool head to a tool holder to secure the tool head against rotation and provide axial prestress. The tool head, which serves as a cutting tool, includes a shank having at least a portion which is conically configured, a threaded bore, and an annular contact collar. The tool holder includes a sleeve-shaped receiving bore corresponding to the shank, at least a portion of the receiving bore being conically configured, a tightening screw, and an annular contact face. An additional bore in the shank of the tool head ensures a prestress between the shank and the tool carrier including the receiving bore, and such prestress is not entirely relieved even if lateral forces act on the tool head. This keeps the tool head from vibrating in the receiving bore.