A stopping fixture for a hollow spindle of a headstock has two elements movable relative to one another in an axial direction of the spindle and insertable into the latter, whereas the elements have inclined surfaces so that when one of the elements is axially displaced relative to the other element, at least one element moves radially outwardly relative to the other element and thereby the elements are firmly clamped against the inner wall of the spindle.
A chuck stop for a multi jaw chuck which has plural webs and a means to grip the bore of the chuck to secure the stop. The webs rest between the jaws so as not to interfere with the action of the chuck. First surfaces of the webs abut the face of the chuck. Work can be squarely aligned against second surfaces of the webs, which are opposite and parallel to the first surfaces.
A stop changer tool for removal of an in-service valve under pressure and comprised of a displaceable shaft assembly supporting at one end an axially compressible elastomeric plug adapted to be inserted through the valve into the upstream pipe. The plug is mounted between a pair of restraining ends such that displacing the shaft assembly in a withdrawal direction draws the restraining ends toward each other to compress and diametrically enlarge the plug until a pressure sealing engagement is achieved with the pipe surface thereat. The restraining ends are formed of laterally displaceable contiguous elements having predetermined face angles on opposing surfaces whereby they are relatively displaced laterally outward concomitantly with compression of the plug so as to substantially restrain the plug against axial extrusion.
A collet stop for positively positioning a workpiece within a collet of a spindle in a multiple spindle lathe is disclosed. An adapter block having a counterbore is secured within the spindle. The collet stop is provided with a body portion, which is adapted to be engaged by the workpiece during use, and a neck portion. The neck portion is sized to be received within the counterbore of the adapter block. A bore is formed through the neck portion. The end of the neck portion is split to define a plurality of flexible fingers. A threaded fastener extends through the bore into cooperation with a tapered lock nut. By tightening the threaded fastener, the lock nut is drawn within the neck portion so as to spread the fingers radially outwardly into frictional engagement with the adapter block counterbore. A plurality of differently sized collet stops are provided for workpieces having different sizes or shapes. The collet stop is quickly and easily changeable with similar collet stops of varying size.
