Wuhan Huazhong Numerical Control Co., Ltd HNC-18iT v4.0 Programming Manual page 104

Function Function Function Function
This command can do a stock removal in facing without groove. The machining path is
A→A'→B
Note Note
Note Note
G00 or G01 must be used in the finishing program – between P(ns) and Q(nf).
1)
Otherwise, there is an alarm message.
G71 can not be used in MDI mode.
2)
G98 and G99 can not used in the finishing program – between P(ns) and Q(nf).
3)
The direction of △x and △z is shown in the following figure.
4)
A
X(+) Z(-)
'
A
'
A
X(-) Z(-)
A
B
B
X(+) Z(+)
+X
+Z
X(-)Z(+)
B
B
Figure 9.17 Direction of the finishing allowance in G71
9. Functions to Simplify Programming
A
A
X(-) Z(-)
'
A
'
A
'
A
'
A
+X
X(+) Z(-)
A
A
100
B
B
X(-)Z(+)
+Z
X(+) Z(+)
B
B
A
'
A
'
A
A