Abstract: A lens barrel including a focus motor, a screw that is provided on an axis of the focus motor and that is rotatably driven by the focus motor, a pulse plate that rotates integrally with the screw, and a holding unit that is provided adjacent to the focus motor. The pulse plate is attached to an outer periphery of the holding unit and an outer diameter of the holding unit is greater than that of the screw.

Abstract: A system for simultaneously forming multiple flutes in a carbide rotary cutting tool includes a chuck adapted to grasp a green rod member and selectively rotate the green rod member about, and translate the green rod member along, a first axis. The system further includes a mechanism adapted to simultaneously machine multiple flutes in the green rod member as the green rod member is rotated about, and translated along, the first axis.

Abstract: In a stand (1), a work-piece spindle (2) is mounted for rotation around a vertical axis (C). On the stand (1), a slide (3) can be shifted horizontally and on the slide, a work-piece carrier (5) can be swivelled around a vertical axis (C1). On the carrier (5), a slide (6) can be shifted vertically. The slide (6) bears a linear guide element (7) able to be swivelled around a horizontal axis (A) and on which a second slide (8) can be shifted. The slide (8) bears the grinding spindle (axis B) with mounted grinding worm (9). A dressing device (12) is arranged, relative to the axis (C1), opposite the work-piece spindle (2). The machine makes easy operation possible, because all parts to be operated are quite accessible.

Abstract: In accordance with the invention, the workpiece (1) is mounted on a lathe headstock spindle rotated by drive means about a headstock spindle axis (I--I). A turning tool (3) is mounted on a toolholder carriage adapted to move in translation along an infeed axis (III) and along a carriage axis (IV). The turning tool (3) has a cutting edge (4) made up of a plurality of cutting edge portions adapted to be individually engaged with the workpiece (1). The turning tool (3) is rotated about an axis (II) which is not parallel to the headstock spindle axis (I--I) to bring the separate portions of the cutting edge (4) of the turning tool (3) successively into contact with the workpiece (1). The invention can be used to cut helical threads.

Abstract: Feed screws are used for container filling machines in order to separate a series of approaching containers at a specific distance from each other. Feed screws for non-rotationally symmetrically shaped containers are milled with a milling tool rotating at a high rpm, the shaft of which is arranged parallel to the longitudinal axis of the feed screw that rotates at a lower rpm. To avoid feed screw flank errors, the rotating milling tool is moved up and down in an oscillating manner, so that a milling tool can be used, the contours of which agree exactly with the associated cross sectional area of the containers which are to be handled. The first shaft of the milling tool is attached to a sliding carriage, which is movably guided in an upward and downward direction by means of a crank mechanism.

Abstract: During grinding, a grinding wheel effects movements of solely vertical displacement along a path parallel to a vertical guide rod. The workpiece to be machined is held by a rotatable, but not axially displaceable, chuck secured to a workpiece head. In order that helical relative movements between the workpiece and the grinding wheel may be produced, transmission components and gearing are provided for positively converting the vertical motion of the grinding wheel into rotary motion of the workpiece. For cylindrical and surface grinding, the motion-conversion arrangement may easily be disengaged or dismantled. Thus it is possible with this universal grinding machine to carry out drill grinding, cylindrical grinding, and/or surface grinding on a workpiece which need be chucked only once.

Abstract: In combination with a lathe holding and slowly revolving, about its longitudinal axis, a work-piece to be screw-threaded with a tapering portion and a cylindrical portion, a tool holder ring is eccentrically mounted about the work-piece and is rapidly rotated about the work-piece in the same direction as the work-piece but at a relatively higher speed; while rotating, the tool holder ring is caused to advance longitudinally along the revolving work-piece; a plurality of cutting elements, radially secured in the holder, have cutting edges that intermittently and successively contact tangentially the work-piece during each revolution so as to move from the work-piece a chip with each revolution; the cutting elements are disposed in a series of planes and the number of planes is equal to the length of the tapering section divided by a pitch of the thread plus one, the depth of the thread being accomplished by the continuous chipping of subsequent cutting elements set on adjacent planes of the tool holder ring.