Setting Of Workpiece Coordinates In Canned Cycle Mode - Mitsubishi Electric MELDAS C6 Programming Manual

13. Program Support Functions
The ideology of the data differs between the absolute value mode (G90) and incremental value
mode (G91) as shown below.
Absolute value mode (G90)
Designate a command value with a symbol for X, Y and Z. R indicates the coordinate value from
the zero point in the absolute value mode, so a symbol must always be added. However, in the
incremental value the symbol will be ignored and will be viewed as the same symbol as for Z. Note
that the symbols will be viewed in reverse for G87.
The hole machining data is held as shown below in the canned cycle. The hole machining data is
canceled when the G80 command or G commands (G00, G01, G02, G03, G2.1, G3.1, G33) in the
01 group are reached.
(Example 2)
N001 G81 Xx
N002 G81 ;
N003 Xx
N004 M22 ;
N005 G04 Xx
N006 G92 Xx
N007 G28 (G30) Z0 ;
N008 ;
N009 G99 Zz
N010 Xx
N011 G98 Xx
N012 Ww

13.1.3 Setting of workpiece coordinates in canned cycle mode

The designated axis moves with the workpiece coordinate system set for the axis.
The Z axis is valid after the R point positioning after positioning or from Z axis movement.
(Note)
(Example)
G54 Xx
G81 Xx
G55 Xx
Xx Yy
4 4
Xx Yy
5 5
Z axis
absolute
R
value
R point
zero point
Z
Yy Zz Rr Ff ;
1 1 1 1 1
Yy ;
2 2
;
3
Yy ;
4 4
Rr Ff L0 ;
2 2 2
Yy Ll ;
5 5 5
Yy Zz Rr ;
6 6 6 6
;
1
When the workpiece coordinates are changed over for address Z and R, re-program
even if the values are the same.
Yy Zz ;
1 1 1
Yy Zz Rr ;
2 2 2 2
Yy Zz Rr ; Re-command even if Z and R are the same as the previous
3 3 2 2
value.
;
;
Incremental value mode (G91)
Only selection of canned cycle sequence
Change of positioning point, and execution of canned cycle
Execution of only M22
Execution of only dwell
Execution of only coordinate system setting
Execution of only reference point (zero point) return
No work
Execution of only hole machining data recording
Change of positioning point, and execution of R point return canned
cycle for I times
5
Change of positioning point, and execution of canned cycle
Execute W axis according to 01 group modal before N001, and then
execute canned cycle
167
13.1 Canned cycles
R
R point
Z