Page 512 - Sensors and Control Systems in Manufacturing

Communications
Another way of specifying a plane is to indicate a point on a sur- 465
face and a second surface lying parallel to the first one—for example:

SURFACE2 = PLANE/P1,PARALLEL,SURFACE1

The geometric dimensions of a workpiece given in the technical
drawing can be fully described using these geometric commands.
The workpiece shown in Fig. 9.24 is to be described using the APT
geometric commands:

P1 = POINT/0.0, 50.0, 0.0
P2 = POINT/80.0, 100.0, 0.0
P3 = POINT/80.0, 0.0, 0.0
P4 = POINT/130.0, 70.0, 0.0
P5 = POINT/130.0, 70.0, 0.0
P6 = POINT/80.0, 50.0, 0.0
S1 = LINE/P1, P2
S2 = LINE/P1, P3
K1 = CIRCLE/CENTER, P4, RADIUS, 30.0
K2 = CIRCLE/CENTER, P5, RADIUS, 30.0
K3 = CIRCLE/CENTER, P6, RADIUS, 0.5
S5 = LINE/P2, LEFT, TANTO, K1
S6 = LINE/P3, RIGHT, TANTO, K2
S4 = LINE/LEFT, TANTO, K2, RIGHT, TANTO, K1
SURFACE1 = PLANE/0.0, 0.0, –2

The commands for defining paths S4, S5, and S6 form tangents to
circles K1 and K2 and are for this reason given the additional func-
tions LEFT, RIGHT, and TANTO. The line S5 starts at P2 and forms a
left (LEFT) tangent to (TANTO) circle K1.

9.6.5.2 Motion Commands
These commands are necessary to describe the path the tools must
travel. A distinction is made between point-to-point (PTP) controls
and path controls. The commands for point-to-point controls are as
follows:
GOTO Absolute statement of the point to be approached
GODTLA Relative statement of the point to the approached

Example: To travel from point 2,5,10 to point 8,10,20, the two commands would
have to be used as follows:

Either GOTO/8,10,20
Or GODTLA/6,5,10