1 8
1 5.3
WEB THINNING SPLIT
-
POINT
After sharpening, do not chance the position of drill in the
prism. Place clearance angle to position
2
(see picture
1 ). Fix the swivel mechanism in boring
C
(see picture 2).
Place the tip angle to
A2
(see picture 3).
In combination of prism feed and motor feed, sharpen
the first side of the drill on-hook (see picture 4). Note the
graduation mark of the motor feed and then move back
to the left away from grinding wheel. Turn the prism for
180°
and move forward to the same graduation mark as
before. The drill should look like on the picture above.
A
B
C
Picture 2
Picture 3
Picture 4
Picture 1