-Shenzhen Guanhong Automation Co.,Ltd.-
SZGH-CNC1000MDb Series
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Tool offset value
Actual movement position
In the absolute mode, the travel distance is increased or decreased as the tool is moved from
the end position of the previous block to the position specified by the block containing G45 to G48.
If a move command with a travel distance of zero is specified in the incremental command
(G91) mode, the tool is moved by the distance corresponding to the specified tool offset value.
If a move command with a travel distance of zero is specified in the absolute command (G90)
mode, the tool is not moved.
Once selected by D code, the tool offset value remains unchanged until another tool offset
value is selected. D0 always indicates a tool offset value of zero.
Warning: 1. When G45-G48 is specified to n axes (n=1-4) simultaneously in a motion block, offset is
applied to all n axes. When the cutter is offset only for cutter radius or diameter in taper cutting, over-cutting
or undercutting occurs.Therefore, use cutter compensation (G40/G41/G42) shown in chapter 3.26.
Fig3.19.3 Tool offset for over-cutting & undercutting
2. G45-G48 (tool offset) must not be used in the G41 or G42 (cutter compensation) mode.
Note: 1.When the specified direction is reversed by decrease as shown in the figure below,the tool moves in
the opposite direction.
2.Tool offset can be applied to circular interpolation(G02,G03) with the G45 to G48 commands only for
1/4 and 3/4 circles using addresses I, J and K by the parameter setting, providing that the coordinate rotation
be not specified at the same time. This function is provided for compatibility with the conventional CNC tape
without any cutter compensation. The function should not be used when a new CNC program is prepared.
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