Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1993-02-17
1994-08-09
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
36447416, 36447419, 408 8, 408 13, B23B 3500
Patent
active
053360249
ABSTRACT:
In a precision drilling method for drilling a straight hole in a work with a drill, a drill unit for rotating the drill is supported to a housing in suspension by an electromagnetic force consisting of separately controllable restoring and damping elements. The drill unit is supported by first restoring and damping elements such that a positional displacement of the drill unit is permitted to relieve a contacting pressure applied to the drill unit when the drill comes into contact with the work. The positional displacement of the drill unit is monitored by sensors. When a force applied to the drill unit, which is determined according to thus monitored displacement, is greater than a critical value, the first restoring element is increased to give a relatively strong support capable of rapidly restoring the position of the drill unit, and preferably the first damping element is also increased to rapidly damp a vibration of the drill unit induced by the positional displacement. Subsequently, the straight hole is drilled in the work with the drill by feeding the housing toward the work. As a result, it is possible to form the straight hole precisely at a desired position in the work without causing a breakage of the drill.
REFERENCES:
patent: 5027280 (1991-06-01), Ando et al.
Fujiwara Shigeki
Nakagawa Teruo
Howell Daniel W.
Matsushita Electric & Works Ltd.
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