FIELD: machine building.
SUBSTANCE: invention relates to mechanical engineering and can be used for sharpening drill bits for angle adjustable installation using a pattern. Corner pattern is designed as a guide plate and forming an angle with recess and between guide and generator. On surface of pattern is applied in form of alignment lines passing through centre of recess forming a parallel guide, and/or marking of levels indicative of said distance to centering guide. Disclosed are various embodiments of alignment patterns, marking angles between generator and guide markings and levels. Disclosed are methods of adjusting patterns.
EFFECT: use of invention improves accuracy of installation of rear-angle drill for sharpening as number of recorded angles and ensure equal angles marked on pattern and obtained by grinding.
25 cl, 20 dwg
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