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1 4
Alignment of drill:
The reversing prism has a clamping range from
220 mm
. Open the prism by turning the
knurled screw. Place the drill in the prism.
Let project the drill around approx.
2025 mm
outside the prism clamp. Close the prism
carefully with the knurled screw, pay attention the the drill still can still be turned. Align
one cutting edge between both graduation lines (see picture). Now tighten the prism with
the knurled screw by hand (without use of force). The drill is know aligned and ready to
sharpen.
Slide prism with the drill onto the prism support and fix with the wing screw. Adjust the
requested top angle (standard
118°
) on the prism support an fix with the clamping lever.
•
right part-scale: support to right stop dog (slot) and adjust clearance angle.
•
left part-scale: support to left stop dog (slot) and adjust clearance angle.
It does not matter which part-scale you use. The clearance angle is adjusted by the scale
for the clearance angle.
•
Direction 3
= more clearance angle
•
Direction 1
= less clearance angle
The clearance angle is adjusted by the clearance angle scale.
1 4.
GRINDING OF RIGHT HAND DRILLS
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.
1 5.
GRINDING OF THE DRILL
main cutting edge