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17
Figure 17
Short swarf material such as brass, bronze,
aluminum and hard cast iron require smaller
cutting angles because the swarf becomes
crushed immediately and the rake angle has
little effect during the cutting stage.
Figure 18
The FK350 uses discs with positive cutting
angles for cutting solid materials and with
negative cutting angles for cutting hollow
profiles. This is because, as a result of the high
cutting speeds (3400 rpm), even with
non-ferrous materials the tool ”strikes” against
the wall of the profile to be cut several times,
thus requiring a cutting edge with a larger
resistant section.
Figure 19
Circular saws can also be characterized by other
parameters such as the whine reduction feature,
which cuts down noise at high speeds, or
expansion, which compensates for the pushing
of chips inside the cutting edge, thus reducing
the thrust on the walls of the material to be cut.
Figure 20