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13. Program Support Functions
(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 ;
The operation stops at after the (1), (2) and (6) commands during single block operation.
x
, y
1
1
(1)
(2)
Z
(3)
(7)
X
G98
d
q
1
(6)
Y
r
(4)
(5)
X
(1) G0 Xx
(2) G0 Zr
(3) G1 Zz
(4) Gn X-(q
r
1
(5) Iq
1
(6) X(q
-r) I(q
1
z
(7)
1
(7)
G98 mode G0 Z-(z
G99 mode
G99 mode G0 Z-z
≥ 0 : G02
n:q
1
< 0 : G03
q
1
r: Tool radius compensation amount of the No.
commanded with "p
272
13.1 Fixed Cycles
Yy
1
1
1
Ff
1
1
-r) I-(q
/2)
1
1
Inner circumference half circle
Outer circumference
/2)
1
Inner circumference half circle
+r
)
1
1
1
"
1
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