Metal tools and implements – making – Blank or process – Drill
Patent
1987-12-14
1989-01-03
Parker, Roscoe V.
Metal tools and implements, making
Blank or process
Drill
409132, 51281P, B21K 502
Patent
active
047948221
ABSTRACT:
A method of manufacturing a rock bit of previously formed lugs which will be welded to form a body. Initially, a shank end positioner means such as drilled holes are formed on the lug, which are then positioned on a mating receiver such as dowels in a fixture. The bearing end of the lug is clamped against a locator block to establish a predetermined relationship between the shank end and the bearing end of the lug. This relationship determines both the radial, axial and angular positions of the bearing and shank ends of the lug. Then, the faces of the lug are machined while held in this accurate aligment. When assembled and welded with similarly manufactured lugs, a bit of exceptional accuracy is produced in a cost effective manner. A slightly different position of the locator block permits the use of lugs of normal forging tolerances to be positioned to provide another location of the faces and bits of different sizes.
REFERENCES:
patent: 4136586 (1979-01-01), Neilson et al.
patent: 4209124 (1980-06-01), Baur et al.
patent: 4414734 (1983-11-01), Atkinson
patent: 4507843 (1985-04-01), Atkinson
patent: 4559852 (1985-12-01), Atkinson
Bellamy Rodney A.
Parrish John D.
Baker Hughes Incorporated
Felsman Robert A.
Parker Roscoe V.
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