Drill for electronic conductor plates

Details Drill for electronic conductor plates Drill for electronic conductor plates

1975-11-17

1978-03-21

Bilinsky, Z. R.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

175394, 408226, B23B 5102

Patent

active

040800938

ABSTRACT:
A drill for electronic conductor plates with a cylindrical drill head which is arranged at the front end of a shank, and which in particular has a working diameter of from 0.5 to 1.2 mm. The rear end of the cylindrical drill head is in the direction toward the drill shank followed by a first shank section of a shorter outer diameter. The drill head and the next following first shank section comprise guiding passages for the drilled out material, especially continuous helical grooves in the manner customary with spiral drills. The drill is characterized primarily in that the first shank section adjacent the drill head conically tapers from the rear end of the drill head in the direction toward the rear end of the drill shank.

REFERENCES:
patent: 262588 (1882-08-01), Hartshorn
patent: 2682792 (1954-07-01), Donnelly
patent: 3778180 (1973-12-01), Ostrom
patent: 3806270 (1974-04-01), Tanner et al.
patent: 3893353 (1975-07-01), Lahmeyer

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