Apparatus for chamfering, pointing or the like of workpieces having a head or shoulder

An arrangement for chamfering or pointing of cylindrical workpieces having a head or shoulder and a shank comprising:

• a cutting tool;
• a rotary table mounted on a support shaft coaxial with said cutting tool;
• drive means including a drive shaft for rotating said rotary table on said support shaft;
• workpiece holding units with holding elements for receiving the workpieces, said units being mounted on spindles for rotation on said rotary table, said elements having axes parallel with an axis of said rotary table;
• a frame;
• said workpiece holding units being mounted in said frame on said rotary table;
• ring means fixed to said frame for guiding the workpieces;
• an entrainment disk rotatable with the rotary table and having holding grooves for the shanks of the workpieces;
• said ring means having an upper surface for guiding the heads of the workpieces, the shanks of the workpieces being guided by said holding grooves of said entrainment disk along an inside surface of said ring means, said upper surface of said ring means extending between feed and removal positions for said workpieces and having at least one plane inclined in a direction of motion of the workpieces when carried by said rotary table for automatic delivery of the workpieces to said cutting tool;
• said upper surface of said ring means having an adjacently connecting planar surface for supporting said workpieces horizontally during final cutting;
• an independent auxiliary drive means for adjustably driving said spindles comprising first drive gears mounted on said drive shaft, said first drive gears being mechanically connected to second drive gears mounted on said support shaft, said second drive gears being in turn operatively connected to pinions mounted on said holding unit spindles, whereby said spindles may be driven by said auxiliary drive means at a preselected rotational speed independently of the rotational speed of the rotary table effected by said drive shaft to adjust the cutting speed to an optimum value;
• and means for pressing the workpieces against the upper surface of the ring means whereby the simultaneous pressing of said workpieces against the upper surface of the ring means, the rolling of the shanks against the inside periphery of said ring means, and the rotation of said workpieces by said auxiliary drive means reduces frictional wear during movement of the workpieces along said ring means by the rotation of the table.