SELF-TEACHING MANUAL
13
·TC· Option
THEORY ON CNC MACHINES.
1
1.7 Spindle speed.
There are two types of speeds; cutting (surface) speed and turning speed.
Regarding the way the spindle works, the CNC offers two choices.
• Cutting (surface) speed (V).
It is the linear speed of the contact points between
the part and the tool.
• Turning speed (N).
It is the angular speed of the part.
The relationship between the two is:
V
2 R N
1000
----------------------------------=
RPM: Constant turning speed.
The CNC maintains the turning speed (N) constant. The
cutting (surface) speed (N) changes.
CSS: Constant surface speed.
The CNC maintains the surface (cutting) speed (V)
constant. The turning speed (N) changes.
V1 = V2
N1 < N2
N1 = N2
V1 > V2
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