1,074 bytes added,
00:08, 27 August 2016 Internal/concave paths must not be angled as it is impossible for a round tool to follow such a path without gouging. Instead arcs must be used with a radius larger than the tool radius. Here is a GCode Example showing a possible internal path and the resulting tool center path with tool radius compensation turned on.
Note a carefully chosen entry move with a convex corner must be made to avoid gouging the path.
[[File:InternalCountourG41.png|none|500x347px]]
'''The G Code:'''
( Tool Table should contain: )<br />( Slot 1 Length 0.000 Diam 0.500 )<br /><br />G49 G40 G54<br />G20 (inches mode)<br /><br />G0 x1y0z0 (Path with no compensation) <br />T1 M6<br />F120<br />G1X4<br />G3X5Y1I0J1<br />G1Y4<br />G3X4Y5I-1J0<br />G1X1<br />G3X0Y4I0J-1<br />G1Y1<br />G3X1Y0I1J0<br /><br />G0 x2y3z0 <br />G41 D1 (Tool #1 Radius comp Left of contour) <br />F60<br />G1X2Y1<br />G3X3Y0I1J0<br />G1X3Y0<br />G1X4<br />G3X5Y1I0J1<br />G1Y4<br />G3X4Y5I-1J0<br />G1X1<br />G3X0Y4I0J-1<br />G1Y1<br />G3X1Y0I1J0<br />G1X3<br />G40<br />G0X2y3z0<br />M30