HUST CNC H6D-T - Page 136

HUST CNC H6D-T Manual
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Tool nose center path at programmed
machining shape
Tool nose center
Hypothetical tool nose point
Actual machining
Machining shape commanded in program
Fig 3-52
Program Format:
T or T ..... Call a tool number for compensation
G41(G42) X(U)___Z(W)___ ..... Set compensation
G40 ..... Cancel compensation
Before using G41 and G42, inform the NC unit which tool-no. is to be used. The
application is totally dependent to the tool path and the relative position of the tool. As
shown in Fig. 3-53, looking forward along the tool path, use G42 if the tool tip radius is
on the right side of the tool path (radius right side offset compensation); use G41 if the
tool tip radius is on the left side of the tool path (radius left side offset compensation)
Fig 3-53 Application of G41 and G42
Direction of tool path
G42 (right side)
Direction of tool path
G41 (left side)
X
Z
W ork
piece