Apparatus for machining a polygon profile on a workpiece

An apparatus for machining a polygonal profile on a workpiece comprising:

• a workpiece spindle for holding and rotating the workpiece;
• a tool spindle movable relative to the workpiece;
• means for rotating the workpiece and tool spindle in synchronism;
• means for eccentrically mounting a tool on the tool spindle such that rotation of the spindle causess the tool to oscillate to intermittently engage the workpiece to machine a polygonal profile thereon;
• and
• means for adjusting the eccentricity of the tool on the tool spindle for machining different profiles on the workpiece.

An apparatus for machining a polygon profile on the workpiece comprising:

• a tool spindle;
• means for rotating the workpiece and the tool spindle in synchronism;
• a machining tool having an eccentric bore;
• a first sleeve portion mounted on the tool spindle, the first sleeve portion being eccentric relative to the tool spindle and adapted to be received by the tool bore to eccentrically mount the tool on the tool spindle, rotation of the tool spindle causing the tool to eccentrically revolve to intermittently engage the workpiece to machine a polygonial profile thereon;
• a counterweight having an eccentric bore;
• a second sleeve portion mounted on the tool spindle, the second sleeve portion being eccentric relative to the tool spindle and offset 180 degrees with respect to the eccentricity of the first sleeve portion and adapted to be received by the counterweight bore to eccentrically mount the counterweight on the tool spindle, the forces generated by the eccentric revolutions of the tool being counteracted by eccentric revolutions of the counterweight to balance the tool spindle;
• and
• means for cooperatively adjusting the eccentricity of the tool and counterweight to machine different profiles and balance the spindle.