Self-teaching manual
14
·TC· Option
THEORY ON CNC MACHINES.
1
ABOUT CONSTANT SURFACE SPEED
To work at constant surface speed (CSS), consider these two aspects.
Part zero must be in the part rotation axis so that the calculated turning speed
is the same as the best cutting speed.
A maximum turning speed must be calculated because the turning speed
increases as the diameter decreases and a certain speed should not be
exceeded on part with a large diameter.
The CNC works at constant surface speed (Vc) and from diameter Dc on, (when
N=Nmax), it works at constant turning speed.
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