B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
77/4
B23B 35/00 (2006.01) B23B 39/00 (2006.01) B23B 41/00 (2006.01) B23B 51/04 (2006.01) B23Q 11/00 (2006.01)
Patent
CA 1070530
APPARATUS AND METHOD FOR PRECISION OVERBORING AN ARCUATE, VARIABLE DIAMETER BORE Abstract of the Disclosure An apparatus and method for precision overboring a variable diameter existing bore through a metal shaft supported in a position that causes the shaft to sag along its longitudinal axis. A plurality of precision- formed tool pilots are selectively mounted ahead of a spade bit on a rotary boring tool to maintain the path of the bit through the shaft/workpiece within a predetermined tolerance of the path followed by an existing bore. A plurality of fluted follower bearings are positioned around the tool driving shaft to minimize its vibration as the bit proceeds through the workpiece. Liquid coolant is passed at high volume into engagement with the bit and thence through the follower bearing exhaust passageways to flush metal shavings and chips from the overbore. According to the method of the invention, tool vibration is carefully monitored as the bit is forced into the workpiece. Responsive to detection of a predetermined degree of tool vibration, the pilots are selectively changed to maintain on the boring tool a pilot having a guide surface diameter within said predetermined tolerance of the various portions of the existing bore through the workpiece sequentially closest to the spade bit, as the pilot passes each such portion.
272590
Long Robert A.
Ness Phillip D.
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