Wuhan Huazhong Numerical Control Co., Ltd HNC-18iT v4.0 Programming Manual page 18

1.5 Spindle
1.5 1.5 1.5 Spindle Spindle Speed Spindle
The cutting speed (v) refers to the speed of the tool with respect to the workpiece when the
workpiece is cut. The unit of the cutting speed is m/min. As for the CNC, the cutting speed
can be specified by the spindle speed (N) in min
The formula to get the spindle speed is:
N: the spindle speed
v: cutting speed
D: diameter value of the workpiece
Example: When the diameter of workpiece is 200mm, and the cutting speed is 300m/min,
then the spindle speed:
The constant surface speed refers to the cutting speed even when the workpiece diameter is
changed, and the CNC changes the spindle speed.
Speed Function
Speed Speed Function Function Function
Chuck
Figure 1.18 Cutting Speed and Spindle Speed
v
1000 ∗
N = =
π D
-1
.
V: Cutting speed
v m/min
1000 ∗ v
N =
π D
1000 ∗ 300
≈ 478
π ∗ 200
14
-1
min
N
·
r / m
1. General