Cutter

Details Cutter Cutter

1987-02-25

1988-08-23

Schmidt, Frederick R.

Cutters, for shaping

Gear cutting tool

Hob

407 61, 407 58, B26D 112

Patent

active

047657820

ABSTRACT:
A cutter for forming a spiral groove on a work is provided.
The cutter comprises a cylindrical body provided on the outer periphery thereof with a plurality of cutting edges arranged circumferentially at equal intervals and displaced axially by a predetermined pitch. Further, each of the cutting edges is provided with a pair of additional cutting edges adjacent thereto and displaced circumferentially on both sides, respectively, so that when the work and the cutter are rotated in the same direction, a high-precision spiral groove is formed on the work.
A screw-shaft machined by the cutter according to the present invention is effectively used for a carriage transfer unit of a still video floppy disk drive, allowing accurate adjustment of the portion of the carriage and accurate transfer of the carriage with respect to the disk to be performed in a simple manner and at low cost.

REFERENCES:
patent: 1348304 (1920-08-01), Muller
patent: 1567733 (1925-12-01), Hanson
patent: 1795093 (1931-03-01), Olson
patent: 2370894 (1945-03-01), Walters

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