Device and method for controlling the machining depth of a machi

Gear cutting – milling – or planing – Milling – Including means to infeed rotary cutter toward work

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408 10, 408 13, 408 95, 36447402, 409193, 409218, B23Q 1500

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active

060152494

ABSTRACT:
The device includes an operating head movable by a control unit with respect to a board for machining; the operating head includes a board holder device and an electric motor for a tool spindle; the rotor of the motor rotates with respect to the stator on air-cushion supports, and the stator slides axially on a further air-cushion support and is insulated with respect to the operating head; a signal generator senses the capacitance between the rotor and the stator, and generates an electric signal upon the tool on the spindle contacting the upper surface of the board; and the signal is used to define a reference dimension relative to the upper surface, and to so condition the control unit as to feed the tool to a predetermined depth as of the upper surface.

REFERENCES:
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patent: 4451892 (1984-05-01), McMurty
patent: 4657451 (1987-04-01), Tanaka
patent: 4765784 (1988-08-01), Karwan
patent: 4826370 (1989-05-01), Conradsson
patent: 5123789 (1992-06-01), Ohtani et al.
patent: 5139376 (1992-08-01), Pumphrey
"Capacitive Top Reference Detection for Blind Hole Drilling of PC Panels", IBM Technical Disclosure Bulletin, vol. 33, No. 3A, Aug. 1990, pp. 239-241.
"Drilling Holes of Accurate Depth", IBM Technical Disclosure Bulletin , vol. 35, No. 3, Aug. 1992, p. 367.
Database WPI, Week 9228, Derwent Publications Ltd., London, GB; AN 92-422419, XP-002071910 & SE 9 003 587 A (Schmitz), May 10, 1992.
Patent Abstracts of Japan, vol. 18, No. 390 (E-1582), Jul. 21, 1994 & JP 06 112659 A (Nippondenso Co), Apr. 22, 1994.

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