Patent ID: 6013016
Filing Date: 2000-01-11
Classification: B23B,Y10T

Abstract:
Apparatus for back boring a first bore in a workpiece, said bore having a first radius, comprising:a bed,a work holder shuttle carried on said bed for movement along a straight-line horizontal path and arranged and constructed to receive and retain the workpiece thereon with said bore having a longitudinal bore axis extending in a first direction transverse to said path,a first rotatable spindle adapted to receive a first boring bar for back boring said bore and to support the boring bar for rotation about and reciprocal motion along a spindle axis disposed transverse to said path,the boring bar being of the type having a radially-projecting cutting tool so that the boring bar has a radius at the cutting tool greater than said bore radius,said spindle being located adjacent one side of said path and carried on said bed by a three-axis support for universal movement horizontally parallel to said path and vertically to coaxially align said spindle axis with said bore axis along a back boring axis when the workpiece is in a final machining position and for movement along said spindle axis to extend and retract the boring bar along said back boring axis during a back boring operation,a shuttle drive operatively connected to said shuttle and configured to move said shuttle along said path and locate the workpiece along said path at a position only horizontally offset from said final machining position such that said bore axis is parallel to and offset from said back boring axis, to provide for inserting a boring bar into said bore and passing a cutting tool of the boring bar through said bore,a spindle drive operatively connected to said spindle and configured to coaxially align said spindle axis with said back boring axis and to advance said spindle along said back-boring axis only when the workpiece is at its horizontally offset position such that a boring bar supported in said spindle is inserted through said bore along said back boring axis and spaced from said bore axis, andsaid spindle drive additionally configured to withdraw said spindle along said back-boring axis only when said workpiece is in its final machining position with said bore coaxially aligned with said back-boring axis such that the boring bar supported in said spindle is retracted along said bore axis to back bore said bore.