Wuhan Huazhong Numerical Control Co., Ltd HNC-18iT v4.0 Programming Manual page 117

Function Function Function Function
G76 command can do the multiple thread cutting. The machining path is A→B→C→D.
Note Note
Note Note
1) The signs of U and W is defined by the direction of AC and CD respectively.
The cutting depth in 1st cut is Δd, the cutting depth in nth cut is
2)
of each cycle is
The cutting speed of BC path is specified by feedrate. And the other paths (AB,
3)
CD, DA) are specified by rapid traverse speed.
（ ）
∆ d n − n − 1
.
nth
d
Figure 9.29 The depth of cutting
113
9. Functions to Simplify Programming
Angle of tool tip
a
Δd
k
1st
2nd
n
Δd
∆ d n
. The bite