Drill comprised of hard metal for drilling contact holes in circ

Details Drill comprised of hard metal for drilling contact holes in circ Drill comprised of hard metal for drilling contact holes in circ

1978-09-14

1980-11-04

Bilinsky, Z. R.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408704, B23B 5102

Patent

active

042316928

ABSTRACT:
A hard metal drill is disclosed for drilling contact holes in multi-legend printed circuit boards formed of synthetic resin. The drill has a diameter of not more than 1.5 mm. and has main and secondary cutting edges and spiral-shaped flutes lying opposite the drill longitudinal axis. At least one of these edges has a different angle or a different legend with respect to a corresponding other edge. The amount of difference of the two cutting angles or lengths to be compared is selected such that a gap between the drill and an edge of the drill hole is at least 20 .mu.m and not more than 50 .mu.m. In order to produce such holes more readily, the two spiral-shaped flutes have different depths.

REFERENCES:
patent: 1407546 (1922-02-01), Joseph
patent: 2396335 (1946-03-01), Moller
Huette Handbook for Managing Engineers, edited by Wilhelm Trust & John., vol. 6th Ed., 1964, p. 537d.

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