Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual page 95

Information
The tool length compensations are effective immediately once the tool is active - if no D number has been programmed -
with the values of D1.
The offset is applied with the first programmed traverse of the respective length offset axis. Observe any active G17 to G19.
A tool radius compensation must also be activated by G41/G42.
Programming example
Tool change without M6 command (only with T):
N5 G17
N10 T1
N11 G0 Z...
N50 T4 D2
...
N70 G0 Z... D1
Tool change using the M6 command:
N5 G17
N10 T1
...
N15 M6
N16 G0 Z...
...
N20 G0 Z... D2
N50 T4
...
N55 D3 M6
...
Contents of a compensation memory
Enter the following in the offset memory:
● Geometrical dimensions: length, radius.
They consist of several components (geometry, wear). The control system computes the components to a certain
dimension (e.g. overall length 1, total radius). The respective overall dimension becomes effective when the
compensation memory is activated.
How these values are calculated in the axes is determined by the tool type and the commands G17, G18, G19 (see
following illustrations).
● Tool type
The tool type (drill, cutter) defines which geometry data are necessary and how they are taken into account.
Tool special cases
For the tool types 'cutter' and 'drill', the parameters for length 2 and length 3 are only required for special cases (e.g. multi-
dimensional length offset for an angle head construction).
Programming and Operating Manual (Milling)
6FC5398-4DP10-0BA1, 01/2014
; Determines the length offset axis (here Z axis)
; Tool 1 is activated with the associated D1
; For G17, Z is length offset axis, the length offset compensation is
overlaid here
; Load tool 4, D2 from T4 is active
; D1 for tool 4 active, only cutting edge changed
; Determines the length offset axis (here Z axis)
; Tool preselection
; Tool change, T1 is active with the appropriate D1
; For G17, Z is length offset axis, the length offset compensation is
overlaid here
; D2 for tool 1 is active; for G17, Z is length offset axis, the
difference of the D1->D2 length offset is overlaid here
; T4 tool preselection; note: T1 with D2 is still active !
; Tool change, T4 is active with the appropriate D3
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