NCT Group 99M, 2000M manual Change of Offset Direction While in the Offset Mode

14 The Tool Compensation

14.5.4 Change of Offset Direction While in the Offset Mode

The direction of tool-radius compensation computation is given in the Table below.

Radius compensation: positive

Radius compensation: negative

G41

left

right

G42

right

left

The direction of offset mode can be reversed even during the computation of tool radius compensation. This can be accomplished by programming G41 or G42, or by calling a tool radius compensation of an opposite sign at address D. When the direction of offset mode is reversed, the control will not check it for being "outside", it will always calculate a point of intersection in first steps. The Figures below assume positive tool radii and change-overs from G42 to G41.

Fig. 14.5.4-1

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