Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1986-01-21
1987-04-21
Olszewski, Robert P.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51219R, B24B 300
Patent
active
046585494
ABSTRACT:
A sharpening device, particularly useful for sharpening tools having two identical cutting edges such as drill bits, comprised of a jig for holding a drill bit used with an adjustable support having a rotatable grindstone and a pivot arm retaining means. The jig has a clamp means for releasably retaining a tool or drill bit in it, and a frame. The frame is connected to the clamp means, and typically carries first and second pivot arms which are symmetrically disposed at an angle to the clamp axis. The first pivot arm is placed in the pivot arm retaining means of the support where the jig can rest in a first rest position in which the clamp axis extends forwardly to intersect a grinding face of a grindstone carried in the support, at a predetermined lateral angle of A.sub.1 thereto. In addition, by inverting the jig, it can rest on the support, in a second rest position inverted from the first position, in which the second pivot arm rests in the pivot arm retaining means, with the clamp axis extending forwardly to intersect the same grindstone grinding face at an equal lateral angle of A.sub.2 and at the same intersection point on the clamp axis. Thus, tools such as drill bits, can have each of their cutting edges accurately and identically sharpened, with the points centered and the cutting edges of the same length and angle accurately obtained during sharpening, basically by simply inverting the jig holding the bit.
REFERENCES:
patent: 4059928 (1977-11-01), Marchitello
Olszewski Robert P.
Rachuba Maurina
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