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Chapter 3 G Commands
67
Ⅰ
Programming
Fig. 3-25
G7.2 path sketch map
Fig. 3-26
G7.3 path sketch map
Explanation:
G7.2, G7.3 are modal;
P is in the parabola standard equation Y
2
=2PX, its range: 1
～
9999999(unit:
0.001mm, without sign);
Q is the angle between the symmetrical axis of parabola and Z, and its range: 0
～
99999999 (unit: 0.001°) .
Parabola direction:
G7.2/7.3 interpolation directions in the front tool post coordinate system and
the rear are reverse.
Fig. 3-27
Front tool post coordinate system
Fig. 3-28
Rear tool post coordinate system
Q value:
1) In the G18 plane, Q value is the gained viewing XZ plane along with the positive direction
of Y axis in the Cartesian right-hand coordinate system, as well, it is an angle when the Z
axis positively rotates to the the parabola with the ellispse long axis along with the CW; refer
to the following figure:
X
X
Z
Z
抛
物
线
起
点
抛
物
线
终
点
S
tarting of p
ara
bol
a
End po
int of p
a
rabo
la
End po
int of p
a
rabo
la
S
tarting poi
nt o
f p
arabo
la
X
X
Z
Z
