Multi-purpose machine tool for high volume secondary operations

A multi-purpose machine for machining crossholes in a workpiece having a centerline, comprising:

• a machine base platform,
• an interchangeable workholder assembly for holding said workpiece mounted on an indexer on said machine base platform, said machine base platform having a horizontal plate spaced therefrom and connected thereto, said plate having an aperture therein for receiving said work holder and for receiving and supporting an interchangeable guide bushing pack assembly,
• a plurality of horizontal machining heads mounted on said machine base platform, each of said horizontal machining heads adapted for substantially simultaneous operation on the workpiece,
• wherein each of said horizontal machining heads has a centerline oriented toward the workpiece centerline,
• wherein the guide bushing pack assembly has a plurality of guide bushings, each guide bushing aligned with one of the horizontal machining heads,
• a gantry assembly mounted on said machine base platform, said gantry assembly arranged to span the workpiece,
• a vertical machining head slidably mounted on said gantry assembly, whereby the position of said vertical machining head is slidably adjustable relative to at least one of said horizontal machining heads along a horizontal axis parallel to said machine base platform.