HUST CNC H6D-T - Page 312

HUST CNC H6D-T Manual
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positioning and the absolute positioning. It is necessary to use
the G90/G91 mode to use them.
*Note 2: For H9D using the incremental address codes U,V,W, it is necessary
to set the parameters 1 of the X,Y,Z axes for the absolution
positioning so that the U,V,W commands can be performed in the
program.
*Note 3: If the G90/G91 mode is used for the 9-axis absolute or incremental
positioning change, no matter the parameters are configured for
absolution positioning or for incremental positioning, the single block
X,Y,Z,A,B,C,U,V,W commands will use the G90/G91 mode for
absolute positioning or absolute increments after the G90/G91 mode
is used.
*Note 4: When the controller in H9D is configured to use U,V,W as the
incremental address codes, it will not be influenced by the G90/G91
mode.
Format of mode appointment:
G90 Absolute coordinate
G91 Incremental coordinate
1. G90 :
When writing G90 in the program, all the axes of X,Y,Z,A,B,C,U,V,W are the absolute
coordinate. All following nodes` axes direction will also feed absolutely. (See EX1)
The incremental codes U,V,W also can be used in G90 mode. Then X, Y, Z axes will
feed incrementally. But A-axis still feed absolutely. Until it meeting G91 or recycling the
program, then the G90 will be over.
EX1: G90 Set Absolute Coordinate
N1 G90
N2 G1 X20.000 Y15.000 .... P0 to P1
N3 X35.000 Y25.000 .... P1 to P2
N4 X60.000 Y30.000 .... P2 to P3
2. G91 :
When writing G90 in the program, all the axes of X,Y,Z,A,B,C,U,V,W are the
incremental coordinate. All following nodes` axes direction will also feed incrementally.
(See EX2)
In G91 mode, X,Y,Z represent the incremental value. The codes of U, V, W are not
necessary. The axis will move to nowhere.
Until it meeting G90 or recycling the program, then the G91 will be over.
EX2: G91 Set Incremental Coordinate
N1 G91
N2 G1 X20.000 Y15.000 .... P0 to P1
N3 X15.000 Y10.000 .... P1 to P2
N4 X25.000 Y5.000 .... P2 to P3