
Operation
Version 1.0.9 dated 2019-05-13
Page 58
Translation of the original instructions
GH 10T | GH 15T
GB
GH10T_G
H15T_G
B_4.
fm
OPTIMUM
M A S C H I N E N - G E R M A N Y
®
Img.4-9:
Twist drill geometry
Point
Main face
Secondary cutting edge
Chamfer width
Drill bar width
Chip surface
Cutting wedge
Cutting edge
Main cutting edge
Cross cutting corner
Point angle
Main cutting length
Cross cutting angle
Cross cutting edge
Back
Back edge
Chip groove
Chamfer
Cross cutting length
B
ac
k
de
pt
h
Co
re
th
ickn
e
s
s
B
ac
k
-
Ø