Water jet cutting machine

A water jet cutting machine, comprising a frame;

• a table supporting a workpiece material to be cut, said table being disposed in said frame;
• an apparatus for cutting at least one aperture in a workpiece material supported on said table, said apparatus being mounted in said frame over said table and including
• a motorized rotary cam drive assembly;
• a first pair of circular cams eccentrically mounted on said drive assembly for rotation therewith;
• a second pair of circular cams eccentrically mounted on said drive assembly for rotation therewith essentially 180 degrees out of phase with the rotation of said first pair of cams, said second pair of cams being spaced below said first pair of cams;
• a first flat plate defining a first pair of spaced apart circular openings having rims lined by a first pair of annularly extending ball bearing traces, said first pair of cams being disposed in said first pair of openings for rotations in said first pair of races;
• a second flat plate defining a second pair of spaced apart circular openings having rims lined by a second pair of annularly extending ball bearing races, said second pair of cams being disposed in said second pair of openings for rotation in said second pair of races such that, upon activation of said drive assembly, said first plate wobbles in a circular pattern which is essentially 180 degrees out of phase with a circular wobble of said second plate, wherein said second plate counterbalances said first plate;
• and at least one water jet aperture cutting tool, each said aperture cutting tool being separately mounted on one end portion of an elongate arm, the other end of said arm being attached to said second plate such that said aperture cutting tool cuts a circular opening in a workpiece material supported on said table as said second plate wobbles.

A cutting machine, comprising:

• a table for supporting a workpiece having a border to be cut;
• an endless track extending along a course substantially following said border to be cut;
• and
• a plurality of movable cutting tools mounted on said track, wherein each of said plurality of cutting tools is adapted to cut a different segment of the border to be cut, and said cutting tools do not directly contact the workpiece during cutting.