Abstract: A C-axis driving device of a computer numerical controlled (CNC) lathing and milling machine includes a spindle, an encoder, a spindle motor, and a servo motor. The spindle has a clamping device and a transmission portion. This encoder connects with the transmission portion via an auxiliary timing belt. The spindle motor and the servo motor connect with the transmission portion via at least one driving timing belt. Only at most one of the spindle motor and the servo motor is to drive this transmission portion at any time during operation. So, it has a simple structure to achieve the clutching change function. It can save more space. And, it can significantly reduce the manufacturing cost.

Abstract: A wood-turning lathe includes a driven shaft mounted with a pulley unit having a plurality of angularly spaced retaining holes, a spring-biased pin and a cam member associated with both the pin and the pulley unit. When the cam member is moved to a locking position, the pin is urged by the cam member to engage a selected one of the retaining holes in the pulley unit to immobilize the pulley unit. When the cam member is moved to an unlocking position, the pin disengages from the selected one of the retaining holes in the pulley unit to permit rotation of the pulley unit.

Abstract: The spindle supporting head of a multiple spindle screw machine is intermittently rotated to place its spindles into successively different angular positions about the axis of a spindle drive shaft which extends coaxially into the center of the head. When each spindle is rotatably indexed into a particular angular position, a piece of bar stock is fed through the spindle and projects beyond one end thereof. Each of a plurality of tool slides, which are mounted adjacent the end of the head from which the spindle projects, carries a tool which registers with the stock projecting from an adjacent spindle. The slides are connected to servo motors which are operable by an associated computer to move their tools toward and away from the stock projecting from the associated spindles. Normally the head is secured against rotation by a hirth ring which intermittently is moved from its locking position to release the head so that it can be rotatably indexed.

Abstract: A device for adjusting the position of a movable working member with respect to a stationary datum surface has a plurality of stop stems, each stem being different in length from the others. A sliding support carries the movable working member whose position is to be adjusted, and is mounted on a guide perpendicular to the datum surface. The sliding support is to be moved until it goes in abutment on a selected stem so as to take a position in which a predetermined distance is set between the movable working member and the datum surface.

Abstract: A stock stop assembly for a multiple spindle lathe is disclosed. A bracket secured to the lathe has a non-threaded aperture formed therethrough. A stock stop includes a head portion having an abutment surface and a threaded shank portion disposed within the bracket aperture. The shank portion can have a flat surface formed thereon. A split locking collar is threaded onto the shank portion. When the shank portion is inserted within the bracket aperture, the locking collar engages the bracket to determine the relative position of the abutment surface. A bore is formed through the adjacent split ends of the lock nut, and a threaded fastener is disposed within the bore. The threaded fastener is tightened to compress the locking collar about the shank portion to secure the locking collar in position. A threaded transverse aperture is also formed in the bracket. A threaded fastener is threaded into the transverse aperture.