# Selection/deselection at inside corners

Selection and deselection at an inside corner means that the transition angle β between the first and last motion block of the contour is less than 180°.

Selection and deselection of closed contours at inside corner

It is recommended to place the selection and deselection point of the TRC on the bisecting line in the selected corner to avoid damaging the contour.

The contour is damaged if the selection and deselection point is incorrectly placed.

Contour violation with G236 at inside corner

## Programing Example

Select and deselect with G236

%g236_test.nc

N01 G236 D1 F1000

N02G01 X10 Y10 (Selection point)

N05 G42

N10 G01 X30 Y30

N20 G01 X30 Y20

;

N100 G01 X10 Y30

N105 G40

N110 G01 Y10 Y10 (Deselection point)

;

N999 M30