Table of Contents
Advertisement
MITSUBISHI CNC
III Functional Specifications
tapping axis of the synchronous tapping in-position check.
→
Feed
rate
Time T →
In-position finish
for G0 feed from
point R
(4)
(1) Section where in-position check is performed using servo in-position width
(2) Section where in-position check is performed using in-position width for tapping
(3) Section where in-position check is performed using in-position width for cutting feed (G1, G2, G3)
(4) Section where in-position check is performed using in-position width for rapid traverse (G0)
4.5.3.2 Pecking Tapping Cycle
M720VW
M system
△
L system
―
The load applied to the tool can be reduced by designating the depth of cut per pass and cutting the
workpiece to the hole bottom for a multiple number of passes.
The amount retracted from the hole bottom is set to the parameters.
Select either the pecking tapping cycle or the deep-hole tapping cycle by parameter.
When the pecking tapping cycle is executed in the synchronous tapping mode, the synchronous tapping
cycle option and pecking tapping cycle option are required.
When "depth of cut per pass Q" is designated in the block containing the G84 or G74 command in the state
where the pecking tapping cycle is selected by parameter, the pecking tapping cycle is executed.
In the following cases, the normal tapping cycle is established.
When Q is not designated
When the command value of Q is zero
G84(G74) Xx1 Yy1 Zz1 Rr1 Qq1 Ff1(Ee1) Pp1 Ss1 ,Ss2 ,Ii1 ,Jj1 ,Rr2 ;
G84
: G84 forward tapping cycle
G74
: G74 reverse tapping cycle
Xx1,Yy1
: Hole drilling position
Zz1
: Hole bottom position
Rr1
: Point R position
Qq1
: Depth of cut per pass (designated as an incremental position)
Ff1
: Z-axis feed amount (tapping pitch) per spindle rotation
Ee1
: Tap thread number per 1-inch feed of Z axis
Pp1
: Dwell time at hole bottom position
Ss1
: Rotation speed of spindle
,Ss2
: Rotation speed of spindle during retract
,Ii2
: In-position width of positioning axis
,Jj2
: In-position width of hole drilling axis
,Rr2
: Synchronization method selection (r2=1 synchronous, r2=0 asynchronous)
(Note)
When ",R0" is commanded, F address is regarded as cutting feedrate.
III - 62
Hole bottom
G1 deceleration
G1 deceleration
start during
start during
tapping cutting
tapping retract
(2)
M730VW
M750VW
△
△
―
―
Point R
G0 feed
start to
point R→
(3)
(1)
M720VS
M730VS
M750VS
△
△
―
―
△
―
Advertisement
Table of Contents
