The special protruding wiper flat design on each of the eight cutting edges offers, at the same time, good surface finish.
Operation B is a deep plunging operation in which the frontal, side and 45-degree cutting edges are all active at the same time.
For machining aluminum and similar soft materials, a ground octagonal insert type OFCR07T-AEN with high positive rake angles and sharp cutting edges is recommended.
For even higher economical milling applications, especially in face machining of engine blocks and very large surfaces, new negative, octagonal inserts with 16 cutting edges, or a positive octagonal insert with eight cutting edges.
The limitations for using higher feeds are insert strength, chipping of the cutting edges as well as cutter toughness and rigidity.
That's why ISCAR produces a full line of curved helical cutting edge carbide inserts for most metal-working applications.
HELIMILL - A helical cutting edge rhombic indexable-milling insert with constant clearance and constant rake for square shoulder or slot milling.
A proper lead angle also allows a cutter to enter and exit the cut more smoothly, thereby reducing shock on the cutting edges.
Failure to do this could cause severe pounding, which can lead to chipped cutting edges, a damaged cutter, and excess wear on the machine.
PHOTO : Double-negative geometry - radial and axial planes - allows strong cutting edges to withstand heavy chiploads and high cutting forces.
There must be at least one insert in the cut at all times to prevent chipped cutting edges caused by pounding.
Lower speeds reduce friction heat at the cutting edge, and therefore reduce overall wear.