Spot facing method and apparatus for printed circuit board

Details Spot facing method and apparatus for printed circuit board Spot facing method and apparatus for printed circuit board

1990-09-21

1992-03-10

Bishop, Steven C.

Gear cutting, milling, or planing

Milling

Process

408 1R, 408 10, 408 12, 409188, 409195, 409218, B23Q 1524, B23Q 1506

Patent

active

050945742

ABSTRACT:
A spot facing method and apparatus for processing a printed circuit board incorporates a sensing device having a sensor probe capable of sensing the level of the surface of a printed circuit board, another sensing device for sensing the position of the end of a tool, measuring circuits for measuring the distance between the sensing probe and the end of the tool and the distance between the surface of the printed circuit board and the end of the tool in accordance with the signals from the sensing devices, and a controller connected to the measuring circuits so as to control the feed of the tool thereby attaining a high dimensional precision in the depthwise direction in the spot facing.

REFERENCES:
patent: 3995969 (1976-12-01), Fleming
patent: 4765784 (1988-08-01), Karwan
patent: 4784541 (1988-11-01), Umehara et al.
patent: 4865494 (1989-09-01), Gudow
patent: 4920495 (1990-04-01), Pilkington

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