HUST CNC H6D-T - Page 50

HUST CNC H6D-T Manual
2 - 38
Fig. 2-30 Incremental Commands
Coordinate Interchange:
P0 to P1 G01 X10.000 F0.200
P1 to P2 X24.000 W-8.000
P2 to P3 U8.000 Z10.000
P3 to P4 W-10.000
or
P0 to P1 G01 X10.000 F0.200
P1 to P2 U14.000 Z30.000
P2 to P3 X32.000 W-20.000
P3 to P4 Z0.000
Simultaneous use of absolute and incremental coordinate systems in a part program is
possible. For the absolute coordinate system, the input error of the previous position,
if any, does not affect the coordinates of the next point. For the incremental coordinate
system, however, all subsequent positioning is affected if the previous position is
incorrect. Therefore, particular attention should be paid when the incremental
coordinate system is used.
There aren’t any rules about when to use the incremental or absolute coordinate system.
It depends on machining requirements. If each machining point is positioned relative to
the home position, it is recommended to use the absolute coordinate system.
For diagonal (simultaneous positioning on the X and Z-axis) or arc movements, the
coordinate value of each axis acquired from trigonometric operations will be rounded
off. In this case, particular attention should be paid when the incremental coordinate
system is used, as machining points may increase, and the more points there are, the
greater the risk of error. Basically, whether an absolute or incremental coordinate is used
10
30
38
P3
P2
P1
P0
5
12
16
Z
X
P4
X0. ZO.