Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1979-07-30
1981-05-26
Briggs, William R.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
83658, 408 87, B23B 3500
Patent
active
042695490
ABSTRACT:
Backup material is formed from a pair of oppositely positioned metallic foil sheets between which an open metallic core having oppositely running node portions is sandwiched. The core may be sinusoidal with each node extending from one of the edges of the sheets to the opposite edges. This sandwich core backup material is placed beneath a printed circuit board to be drilled, such that with drilling, the drill penetrates through the top sheet and not the bottom sheet, thus terminating in the area of the open core. The backup material prevents the formation of burrs around the holes drilled in the circuit board and at the same time facilitates cooling the drill and the workpiece and the removal of cuttings therefrom.
REFERENCES:
patent: 3700341 (1972-10-01), Block
patent: 3719113 (1973-03-01), Gerber et al.
patent: 3781124 (1973-12-01), Bodycomb et al.
Briggs William R.
LCOA Laminating Company of America
Sokolski Edward A.
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