Wuhan Huazhong Numerical Control Co., Ltd HNC-18iT v4.0 Programming Manual page 20

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Tool Length Compensation
There are two kind of ways to specify the value of tool length compensation.
- Absolute value of tool length compensation (the distance between tool tip and
machine reference point)
- Incremental value of tool length compensation (the distance between tool tip and
the standard tool)
As it is shown in Figure 1.21, L1 is the tool length on X axis. L2 is the tool length on Z axis.
It should be noted that the tool wear values on X axis or Z axis are also contained in the tool
length compensation.
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Tool Radius Compensation
Figure 1.22 shows the imaginary tool nose as a start position when writing a program.
R
S
P=Tool P=Tool tip tip
P=Tool tip P=Tool tip
R=Radius R=Radius
R=Radius R=Radius
S=Cutting edge S=Cutting S=Cutting S=Cutting edge edge center edge center center center
Figure 1.21 Tool Length Compensation
P
Imaginary tool nose
Figure 1.22 The imaginary tool nose
L2
Tool nose radius center
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1. General
L1