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1 6
Let project the drill approx.
15 mm
out of the prism.
Align one cutting edge parallel to the gaduation mark for left hand drills (Picture).
Adjust the request clearance angle on the scale (Picture).
Applicative scale range for left hand grinding: 2-3.
2
= slight clearance angle
3
= high clearance angle
Move the drill to the front side of the grinding wheel, by using the prism feed and the
motor feed. By carefully feeding with the prism feed and meantime turning the prism
upside down, grind the first cutting edge completely. Note the graduation No. on the
scale, feed back, remove and turn the prism, place again in the prism support, fix it and
grind the second cutting edge to the same graduation as noted.
GRINDING OF THE DRILL
Clamping screw
Graduation line for left
hand drills