FANUC Series 16/18/160/180-Model C for Lathe Operator Manual

PROGRAMMING
B–62754EN/01
15. COMPENSATION FUNCTION
211
It is difficult to produce the compensation necessary to form accurate parts
when using only the tool offset function due to tool nose roundness in
taper cutting or circular cutting. The tool nose radius compensation
function compensates automatically for the above errors.
Workpiece
Insufficient
depth of
cutting
Shape processed without tool
nose radius compensation
Tool path without compensation
Tool path with compensation
Tool nose
Fig15.2 Tool path of tool nose radius compensation
R
The tool nose at position A in following figure does not actually exist.
The imaginary tool nose is required because it is usually more difficult to
set the actual tool nose radius center to the start position than the
imaginary tool nose (Note).
Also when imaginary tool nose is used, the tool nose radius need not be
considered in programming.
The position relationship when the tool is set to the start position is shown
in the following figure.
A
Start position
Start position
When programmed using the
tool nose center
When programmed using the
imaginary tool nose
Fig.15.2.1(a) Tool nose radius center and imaginary tool nose
15.2
OVERVIEW OF TOOL
NOSE RADIUS
COMPENSATION
15.2.1
Imaginary Tool Nose

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