Optimum OPTI turn TU 3008G Operating Manual page 44

For infeeds of 0.05 to 0.5 mm per revolution and depths of cut of 0.2 mm to 3.0 mm.
The different apex angles (  ) of the cutting form level need to conduct the chip.
 
Img.4-24: Positive apex angle for planing Img.4-25: Neutral apex angle for planing and rough-
ing
j
Img.4-26: Negative apex angle for roughing
The ready-ground major cutting edge must be slightly ground with a grindstone for the
planing.
For the roughing, a small chamfer must be produced with the grindstone in order to stabilize
the cutting edge against striking chips (b = f x 0.8).
f
b
f
10°
Img.4-27: Stabilize cutting edge
Operation
GB TU3008G
44 Translation of original instruction Version 1.1.6 - 2021-9-17