摘要:
A workpiece-holding plug has six sector-shaped segments that expand outwardly in a radial direction when in use and in contact with a lathe center. The segments have tapered outer wall portions which assume a precise cylindrical shape when the plug is expanded so that the central axis of the lathe center is maintained in precise concentric relationship to the central axis of the workpiece. The plug is of a particular construction which ensures that each of the segments shifts radially outwardly an equal distance, and yet has sufficient resiliency for self-contraction when the work operation is completed so that the plug may be readily removed from the workpiece. The plug has particular utility for holding a press roller on a lathe during reconditioning of the outer rubber surface of the roller.
摘要:
The tailstock of a universal grinding machine has a lower part which is affixed to the frame at a level below the indexible head for a set of grinding spindles, and an upper part which supports one or more dead centers and is indexible relative to the lower part about a horizontal axis extending at right angles to the axis or axes of the center or centers. The upper part of the tailstock has several facets and the number of such facets exceeds the number of dead centers by at least one. Each center is mounted on a discrete facet and the unoccupied facet is indexed to a position below the material removing station of the grinding machine when the head is to be indexed whereby the center or centers on the upper part of the tailstock cannot interfere with movements of the selected grinding wheel to and from the material removing station. The head can support a grinding wheel for removal of material from cylindrical external surfaces of workpieces, a grinding wheel for removal of material from cylindrical internal surfaces of workpieces, and a grinding wheel for removal of material from flat surfaces.
摘要:
A hydraulic circuit for use on a turning machine (10) having a quill (32) which is movable to an extended and retracted position for detecting, through pressure drop, when the quill (32) is fully retracted or extended and engaging a workpiece. The quill (32) is positioned by a hydraulic cylinder (40) which is operated from a hydraulic power supply (60). A pressure actuated switch (48) is connected to one of the operating ports on the hydraulic cylinder (40) and a orifice (70) is connected to the same port. By detecting when the pressure sensitive switch (48) is activated with respect to positioning of the hydraulic cylinder (40) proper functioning of the quill (32) can be determined. A timer (90) circuit is provided for determining that the pressure sensitive switch (48) changes position within a set time period after the hydraulic circuit is activated to change position of the quill (32).
摘要:
A tool holding apparatus adapted to releasably lock a tool, such as a drill or reamer, within the tailstock spindle of a lathe or the like to thereby prevent relative rotation between the tool and spindle. The holding apparatus comprises a supporting arm adapted to be clamped about the spindle, a mounting arm adapted to be secured to the tool, and an interconnecting rod which permits the supporting arm and mounting arm to freely move relative to each other in parallel planes such that the mounting arm becomes automatically centered about the axis of the tool.
摘要:
A hydrostatic bearing assembly for a grinding machine comprising a head stock including at least one bearing housing, the bearing housing having a cylindrical bore for receiving a rotatable spindle and a plurality of circumferentially spaced, axially extending pads established in the cylindrical wall of the bore, a corresponding plurality of fluid manifolds, means for establishing parallel fluid flow paths between the plurality of bearing housing pads and the corresponding plurality of fluid manifolds, means for supplying pressurized liquid to the plurality of fluid manifolds and means for sensing when the pressure of the fluid flowing to any one of the plurality of bearing housing pads is less than a predetermined minimum pressure and means for stopping or preventing the operation of the grinding machine when the sensed pressure of the fluid flowing to any one of the plurality of bearing housing pads is less than the predetermined minimum pressure.
摘要:
A universal bracket for saber saws to convert handheld saber saws to a table tool. A table supporting plate and saber saw shoe plate are secured to opposite ends of a tube that slidably supports a bearing like tool carrier which links the saber saw, via a blade like member, to a tool extending above the table supporting plate.
摘要:
An improved machine tool includes a tailstock having a center assembly which is movable between operating and retracted positions by a piston and cylinder assembly. When the center assembly is in the operating position, a main axis of the center assembly is aligned with the axis of rotation of a workpiece. In the retracted position, the center assembly is offset to one side of the workpiece. When the center assembly is in the operating position, a tailstock motor is activated to press the center assembly against the outer end of the workpiece to thereby support the workpiece in a known manner. A control system coordinates movement of the center assembly with movement of a turret to avoid interference between the tailstock and tools mounted on the turret.
摘要:
Guiding apparatus for controlling the movement of a rectilinear movable part in a machine tool. The part is guided by reference to a stationary beam of light. Part is mounted in sliding contact bearings in guideway. Disposition of the part controlled by electro-hydraulic circuit which operates on the bearings in response to changes in position of the part relative to the stationary light beam.
摘要:
A footstock for a machine tool having housing with a lengthwise opening therein. A spindle is mounted in said opening. First spindle-supporting means is mounted in the opening adjacent a center carrying end of the spindle and engaging the side of the spindle opposed to the load on the center. Second spindlesupporting means is mounted in the opening engaging the side of the spindle on which the center is loaded. The spindle-supporting means are advanceable transversely of the axis of the spindle for aligning the spindle and center.