Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1976-04-06
1977-10-11
Hinson, Harrison L.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
408 83, 408 57, 408201, 29 11, B23B 3500, B23B 2710, B23B 5100, B23B 1300
Patent
active
040532496
ABSTRACT:
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.
REFERENCES:
patent: 1002502 (1911-09-01), Dougherty
patent: 1954034 (1934-04-01), Arp
patent: 2014679 (1935-09-01), Eckroate
patent: 2334795 (1943-11-01), Smith
patent: 2956456 (1960-10-01), Biseglia et al.
patent: 3028772 (1962-04-01), Mossberg
patent: 3164039 (1965-01-01), Woods
patent: 3854839 (1974-12-01), Gottelt
Long Robert A.
Ness Phillip D.
Forman Joseph B.
General Electric Company
Hinson Harrison L.
Myles Vale P.
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