Mitsubishi Electric MELDAS C6 Programming Manual page 172

13. Program Support Functions
(l) G76 (Fine boring)
Program
G76 Xx
The operation stops at after the (1), (2) and (7) commands during single block operation.
When this command is used, high precision drilling machining that does not scratch the
machining surface can be done.
(Positioning to the hole bottom and the escape (return) after cutting is executed in the
state shifted to the direction opposite of the cutter.)
Spindle
orient
position
Command I, J, and K with incremental values in the same block as the hole position data.
I, J and K will be handled as modals during the canned cycle.
(Note)
Yy Zz Rr Iq Jq
1 1 1 1 1 2
(7)
x , y
1 1
(1)
(8)
(2)
(7)
(8)
(3)
(6)
G98 G99
(4)(5)
mode mode
Tool during cutting
Cutter
Cancel
Cancel
Shift
Shift
Shift amount
If the parameter "#1080 Dril_z" which fixes the hole drilling axis to the Z axis is
set, the shift amount can be designated with address Q instead of I and J. In this
case, whether to shift or not and the shift direction are set with parameter
"#8207 G76/87 IGNR" and "#8208 G76/87 ( − )". The symbol for the Q value is
ignored and the value is handled as a positive value.
The Q value is a modal during the canned cycle, and will also be used as the
G83, G87 and G73 cutting amount.
164
Ff ;
1
(1) G0 Xx
(2) G0 Zr
(3) G1 Zz
r
1
(4) M19 (Spindle orient)
(5) G1 Xq
G98 mode G0Z − (z
(6)
G99 mode G0Z − z
(7) G0 X − q
z
(6)
1
(Shift)
(8) M3 (Spindle forward rotation)
The shift amount is designated as
Tool after cutting
shown below with addresses I, J
and K.
For G17 : I, J
For G18 : K, I
For G19 : J, K
The shift amount is executed with
linear interpolation, and the feed
rate follows the F command.
Machining hole
13.1 Canned cycles
Yy
1 1
1
Ff
1 1
(Yq ) Ff (Shift)
1 2 1
+r )
1 1
1
(Y − q
) Ff
1 2 1