Error message: "A TRC is not possible !" or "Cutter radius compensation error!"

Last change: Apr 20, 2023

This error message typically occurs if you try to start the simulation immediately after switching on the tool or cutter radius compensation (with G41 or G42).

With active SRC or FRC, the tool moves on an equidistant (which means on a path with a constant distance, namely that of the cutting radius) along the programmed contour.

If you think of a connecting line from the center of the cutting edge or cutter to the contour, then this line is always perpendicular to this contour.

So much for the theory. However, this only works if there is a contour, so that the tool already "knows" in which direction it will continue after the first contour point. So you have to write at least one additional traverse block before the simulation works.

Here is an example from Milling:

; RP: 100 x 70 x 20
N1 G54
; SFR20
N2 T3 F480 S1300 M13
N3 G0 X-5 Y-10 Z1
N4 G0 Z-5
N5 G41
N6 G1 X5 Y5

The simulation call at this stage of the program results in the said error message.

With N7 Y65 it works!