Siemens SINUMERIK 840D sl Programming Manual page 86

Tool offsets
5.8 Programmable tool offset (TOFFL, TOFF, TOFFR)
Example 2: Negative tool length offset
The active tool is a drill with length L1 = 100 mm.
The active plane is G18, i.e. the drill points in the Y direction.
The effective drill length is to be decreased by 1 mm. The following variants are available for
the programming of this tool length offset:
TOFFL=-1
or
TOFFL[1]=-1
or
TOFF[Y]=1
Example 3: Changing the programming type from TOFFL to TOFF
The active tool is a milling tool. The active plane is G17.
Program code
N10 TOFFL[1]=3 TOFFL[3]=5
N20 TOFFL[2]=4
N30 TOFF[Z]=1.3
Example 4: Plane change
Program code
N10 $TC_DP1[1,1]=120
N20 $TC_DP3[1,1]= 100
N30 T1 D1 G17
N40 TOFF[Z]=1.0
N50 G0 X0 Y0 Z0
N60 G18 G0 X0 Y0 Z0
N70 G17
N80 TOFFL=1.0
N90 G0 X0 Y0 Z0
N100 G18 G0 X0 Y0 Z0
In this example, the offset of 1 mm in the Z axis is retained when changing to G18 in block
N60; the effective tool length in the Y axis is the unchanged tool length of 100 mm.
However, in block N100, the offset is effective in the Y axis when changing to G18 as it was
assigned to tool length L1 in the programming and this length component is effective in the
Y axis with G18.
86
Comment
; Effective offsets: L1=3, L2=0, L3=5
; Effective offsets: L1=3, L2=4, L3=5
; Effective offsets: L1=0, L2=0, L3=1.3
Comment
; Tool change L1=100mm
; Offset in Z direction (corresponds to L1 for G17).
; Machine axis position X0 Y0 Z101
; Machine axis position X0 Y100 Z1
; Offset in L1 direction (corresponds to Z for G17).
; Machine axis position X0 Y0 Z101.
; Machine axis position X0 Y101 Z0.
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals