Cutters – for shaping – Including tool having plural alternatively usable cutting edges – With integral chip breaker – guide or deflector
Patent
1977-06-28
1978-12-05
Vlachos, Leonidas
Cutters, for shaping
Including tool having plural alternatively usable cutting edges
With integral chip breaker, guide or deflector
407 45, 407120, 408187, 51220, B26D 100, B26D 112, B23B 5116
Patent
active
041283600
ABSTRACT:
This invention pertains to a cutting tool bit as used with and in the back spot facing tool as shown in my U.S. Pat. No. 3,827,821 as issued on Aug. 6, 1974. As shown in this patent the cutting tool bit member has unequal projections and cutting faces and it is contemplated that the shorter blade portion is three-quarters the length and has an effective cutting area three-quarters of the full length blade portion. To insure a smooth and flat spot face a precise grinding of this cutting tool bit is required. It is also required that the chips be directed in a desired spiral away from the cutting tool. An eight degree slope is provided as an angled face on the top surface of the cutting tool. The cutting edge of the cutting tool bit is also relieved preferably by a three degree slope away from the cutting edge. The top surface of the cutting tool also has a seven degree slope and with these combined three slopes it is desired and necessary that the facing cutting tool edge of the bit be ground at and with a 17 minute slope toward the center of the tool to insure that the faces of both the longer and the shorter cutting tool edges are in an exact plane and are exactly at 90.degree. to the axis of the rotation of the tool. In one embodiment a chip breaker is formed in the top surfaces of the tool bit. Precise grinding fixtures are disclosed to grind the tool to this determined condition both with and without a chip breaker in the top surface of the bit.
REFERENCES:
patent: 3827821 (1974-08-01), Swenson
patent: 3911543 (1975-10-01), Sorice
Roberts Ralph R.
Vlachos Leonidas
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