Siemens Sinumerik 840D sl Programming Manual page 55

G functions used for the tool length compensation
The tool length compensation is called with the following G functions.
Table 3- 8
G function
G43
G44
G49
● G43 and G44 are modal and remain active till they are deselected through G49. The tool
● By specifying "G43 (or G44) Z... H... ; " the tool offset amount specified with the H
● By specifying "(G01) Z... ; G43 (or G44) H... ; " the Z axis traverses the path that
● By specifying "G43 (or G44) Z...H...H... ; " the Z axis traverses the path that corresponds
H function for specification of the tool offset direction
The direction of tool offset is determined by the sign of the tool length compensation that is
activated by the H function, and the programmed G function.
Table 3- 9
G43
G44
ISO Milling
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
G functions used for the tool length compensation
length compensation is deselected with G49. H00 can also be used to deselect the tool
length compensation.
function is added to or subtracted from the specified position of the Z axis, and the Z axis
then traverses to the corrected target position, i.e., the target position of the Z axis
specified in the program is shifted by the magnitude of the tool offset.
corresponds to the tool offset amount specified via the H function.
to the difference between the previous tool offset amount and the new tool offset amount.
Signs are present before the amount of tool offset and direction of tool offset
Signs of tool offset amount (H function)
positive
Tool offset in positive direction
Tool offset in negative direction
Function
Addition
Subtraction
Deselection
negative
Tool offset in negative direction
Tool offset in positive direction
Motion commands
3.4 Tool offset functions
G group
08
08
08
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