US3749190A - Retaining carbide in rock drill bits - Google ...
The method of retaining a carbide button, having an unformly-diminishing cylindrical surface, in a rock drill bit comprising: forming a hole in the bit to receive the button; forming an undercut in the hole a substantial distance from the bottom of said hole; setting a tapered carbide button in the hole, with the taper-defined larger end of the ...
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