Reaction on contour change

A direct contour change, e.g. from G41 to G42, is permitted without any explicit deselection (G40) of TRC. The contour change corresponds to a TRC deselection and selection. Contour change should only be carried out for linear NC blocks for exit and approach blocks. Circular blocks are also permitted directly before and after a contour change.

Notice

notice

If a circular block is programmed during a contour change, an error message is output.

Programing Example

prg_example

Reaction on contour change

N05 G01 Y10 F100 G41 V.G.WZR=2

(Linear block with select. of TRC left)

(of the contour)

N10 X20 Y25

N20 X40 G42

(Linear block with select. of TRC right)

(of the contour)

N30 X60 Y10

N40 X0 Y0 G40

(Deselect TRC)

N50 M30

Example of a selection change without deselection
Example of a selection change without deselection