Methods and apparatus for forming holes in workpieces

Details Methods and apparatus for forming holes in workpieces Methods and apparatus for forming holes in workpieces

1979-04-24

1981-04-07

Bilinsky, Z. R.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

408 41, B23B 3500, B23B 3922

Patent

active

042603005

ABSTRACT:
A hole is formed in a workpiece by advancing together a pair of cutter-carrying boring bars from opposite sides of the workpiece. Rotation of the boring bars is synchronized to maintain the cutter-carrying portion of each boring bar in alignment with an axial recess in the boring bar. As the boring bars converge, the cutter-carrying portions enter the respective recesses whereby the cutter bits pass one another axially to complete the hole. The axes of rotation can be aligned to form a circular hole, or mutually spaced to form an oval hole.

REFERENCES:
patent: 718863 (1903-01-01), Norris
patent: 1487589 (1924-03-01), Miner et al.

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