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3.3 Retract from profile The retract from the profile is analogous to the profile approach: also in this case the CNC changes the meaning of the programmed positions, but in inverted direction; it interprets no more the positions as profile positions, but as tool center positions. The “G” function to be used is G40. In the first movement block following that containing G40, it is necessary to program a movement type (G1, G2 or G3). 3.3.1 G40 – circular tangent retract (G40 X.. Y..) With G40 X Y the CNC executes a circular element tangent to the last profile element executed, Bringing the tool center on the indicated final point. G41 ......G40 X0 Y40G1 X0 Y20... Y Y 40 ...G40 X20 Y30G1 X0 Y20......G41 ... ... 20 2030 X X 20 G41 .........G2 I0 J0 X30 Y0G40 X60 Y0 Y ... Y ...G41 .........G2 I0 J0 X30 Y0G40 X50 Y-15 X R30 R30X0-15 60 50 38
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