Method and apparatus for grinding button bits

Details Method and apparatus for grinding button bits Method and apparatus for grinding button bits

B - Operations, Transporting

21

F

26/167

B21F 45/16 (2006.01) B24B 3/24 (2006.01) B24B 3/33 (2006.01)

Patent

CA 1168033

ABSTRACT This invention relates to a method and an apparatus for restoring the shape of button bits by grinding every button. At known technique the buttons are dressed by a hand-held grinder, which normally also is used for removing steel material of the bit about the buttons. It was, however, found impossible by this method to satisfy satisfactorily the prevailing demand for regrinding button bits. For solving this problem, according to the invention a method is proposed which is characterized in that the button in the bit to be ground is caused to rotate substantially about its own long- itudinal axis, and that thereafter grinding is carried out in two subsequent steps for removing material about the button by a first grinding wheel and for forming the button by a second grinding wheel.

359748

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