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Chapter 3 G Commands
139
Ⅰ
Programming
R
I
K
F
X
Z
A
B
C
B
：
Start point
C
：
End point
A
：
Center
Precautions:
1) R value is enabled when R is simultaneously specified with I or K;
2) The specified arc block by arc thread must be performed within the certain area (The area
of which the X or Z axis is separately regarded as long axis); refer to the following figure:
45°
45°
Z
X
Z
X
Start point
End point
Start point
End point
3) The arc specified by arc thread, if its long axis changes, the alarm may occur; refer to the
following figure:
45
°
Z
X
End point
Start point
The change pos
3.23.4 Thread Cutting with Variable Lead G34
Command format
：
G34 X(U)__ Z(W)__ F(I)__ J__ K__ R__
；
Command function:
The motion path of tool is a straight line from starting point of X, Z to end
point specified by the block, the longer moving distance from starting point
to end point(X in radius value) is called as the long axis and another is
called as the short axis. In course of motion, the long axis traverses one
lead when the spindle rotates one rev, the pitch increases or decreases a
