Method and apparatus for drilling small diameter holes in fragil

Details Method and apparatus for drilling small diameter holes in fragil Method and apparatus for drilling small diameter holes in fragil

1989-06-15

1990-09-11

Hartmann, J. J.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51424, 51436, B24B 100, B24C 900

Patent

active

049551647

ABSTRACT:
An abrasivejet drilling system is disclosed for drilling small diameter holes in fragile materials of the type which tend to crack when impacted by such jets. The system employs a drilling jet formed from a high pressure liquid whose pressurization varies with time during the drilling process. To avoid damage to fragile materials, angular holes are drilled by initially penetrating the surface of the fragile workpiece perpendicular to the workpiece's surface and thereafter pivoting the jet to the correct angle. The jet dwell in the drilled hole for a predetermined time to modify the hole geometry is monitored by detecting the change in sound level when the jet drills completely through the workpiece.

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patent: 4712736 (1987-12-01), Bray et al.
patent: 4846402 (1989-07-01), Sandell et al.

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