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Abrasive-wheel

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Abrasive wheel

Details

Inventors: Siden, Jan;
Assignee: Inovac AB (Skelleftea, SE)
Primary Examiner: Schmidt; Frederick R.
Assistant Examiner: Rachoba; M.
Attorney, Agent or Firm: Cushman, Darby & Cushman

An abrasive wheel for grinding the cutting pins of a button-type drilling bit in a grinding machine of the kind provided with a rotatable holder for fixating the pins of the bit in a grinding position and for rotating thus fixated pins. The machine also includes a spindle on which the abrasive wheel can be mounted in a given position. The spindle/holder is linearly movable in a plane which extends through and is contained by the respective rotational axes of the holder and the spindle and in a direction parallel with the rotational axis of the spindle. The abrasive wheel includes circular flange parts which embrace a profiled groove therebetween. To enable cutting pins to be ground to an obtuse tip-profiled shape with the aid of such an abrasive wheel, the profiled groove, when seen in cross-section, is formed symmetrically around a line which intersects the rotational axis of the abrasive wheel at an angle whose complementary angle is equal to the angle of inclination of the spindle. The inward part of the profiled groove is widened symmetrically in relation to a predetermined transverse measurement and presents at least the same widening along the whole of it cross-section, upto the location of an outer limiting line, where the groove has a width or a breadth which is greater than the diameter of the pin for which the abrasive wheel is intended.

DETAILED DESCRIPTION Consequently, the object of the present invention is to provide and abrasive wheel for a grinding machine of the aforesaid kind which will enable the cutting pins or buttons of a button-type drilling bit to be ground to the intended, pointed tip profile.

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