1 8.
WEB THINNING
1 5
With the new clamping prism it is now possible to thin the web of
the sharpened drill.
1 .
The boring holes
A
and
B
are for grinding of cutters and
drills with 4 facet shape.
2.
The boring
C
is for web thinning.
For web thinning let project the drill 25 mm outside the prism and
do not change the possition of the drill in the prism. Fix the prism
with the knurled screw in hole
C
.
Use the upper boring on the prism support. Loosen the clamping
lever and move the prism support to
90°
.
By use of the prism- and motor feed, thin the web of the drill by using the left edge of the
grinding wheel.
After one side is finished, nore the graduation marks on the prism feed screw and move
back for one turn. Now reverse the prism for
180°
, fix again in hole
C
and move forward
with the prism feed to the same graduation mark on the knurled screw.
Prism support
90°
Fixation screw
Clamping lever
A B
C
A
B
C