System information

SECTION SIX - PARAMETRIC PROGRAMMING

Back line

G2 R1 XC3 YC1.5 AB270

Back - extend back from (1,2)

W145 - extend the line from (1,2) at an angle of 145°

X6 YZ

X4 Y1.5

The back line function may be used on any line command. This function reverses the direction of

the programmed line. Back line is normally used when you know the end point of the line and

not its starting point. The end point is programmed and the line is extended backward to the start

point. When using this function all Trig Help functions are still valid.

Example 1:

X6 Y2

X4 Y1.5

G1 X1 Y2 back C0 W145

C0 - use the arc intersection closest to (1,2)

Example 2:

G2 R1XC3YC1.5 AB270

G1 X1 YZ BACK C2 W145

C2 - use the farthest intersection

Example 3:

X6 Y2

X4 Y1.5

X1 Y2 BACK C0 W-35

Note: This example uses a back line between two lines to program an unknown point.

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