13. Program Support Functions
13.1 Fixed Cycles
272
(l) G75 (Fine boring)
Circle cutting cycle performs a series of the cutting as follows:
First: positioning of X and Y axes to the circle center.
Next: cutting in with Z axis to the commanded position.
Then: moving the perfect round cutting the inside of the circle.
Until: returning to the circle center.
Program
G75 Xx1 Yy1 Zz1 Rr1 Qq1 Pp1 Ff1 ;
(4)
G98
d
G99 mode
(1)
(2)
(3)
(6)
(7)
x
1
, y
1
z
1
r
1
(5)
(7)
r
q
1
Y
X
Z
X
(1) G0 Xx
1
Yy
1
(2) G0 Zr
1
(3) G1 Zz
1
Ff
1
(4) Gn X-(q
1
-r) I-(q
1
/2)
Inner circumference half circle
(5) Iq
1
Outer circumference
(6) X(q
1
-r) I(q
1
/2)
Inner circumference half circle
(7)
G98 mode G0 Z-(z
1
+r
1
)
G99 mode G0 Z-z
1
n:q
1
≥
0 : G02
q
1
<
0 : G03
r: Tool radius compensation amount of the No.
commanded with “p
1
"
The operation stops at after the (1), (2) and (6) commands during single block operation.