Compensation Memory Structure - Siemens SINUMERIK 840D sl Function Manual

W1: Tool offset
18.2 Tool
Activating the tool offset
D1 to Dn activate the tool compensation for a cutting edge on the active tool. Tool length
compensation and tool radius compensation can be activated at different times:
● Tool length compensation (TLC) is performed on the first traversing motion of the axis, on
which the TLC is to act.
This traversing motion must be a linear interpolation (G0,G1, POS,POSA) or polynomial
interpolation (POLY). If the POS/POSA axis is one of the active geometry axes, the tool
length compensation is applied with the first axis motion in which the WLK is supposed to
act.
● Tool radius compensation (TRC) becomes active when G41/G42 is programmed in the
active plane (G17, G18 or G19).
In the NC block in which the tool radius correction is activated with G41/G42, G0 (rapid
traverse) or G1 (linear interpolation) must be active and at least one geometry axis of the
active working plane must be programmed.
If only one geometry axis is specified when switching on, the last position of the second
geometry axis is automatically supplemented and then traversed in both axes.
If the axes are not geometry axes, then they must be transformed into geometry axes using
GEOAX programming.
The selection of tool radius compensation with G41/G42 is only permitted in a program
block with G0 (rapid traverse) or G1 (linear interpolation).
18.2.2

Compensation memory structure

Tool compensation memory size
Each channel can have a dedicated tool compensation memory (TO unit).
Which tool compensation memory exists for the relevant channel is set with the machine data:
MD28085 $MC_MM_LINK_TOA_UNIT (Assignment of TO unit to a channel).
The maximum number of tool cutting edges for all tools managed by the NCK is set with the
machine data:
MD18100 $MN_MM_NUM_CUTTING_EDGES_IN_TOA (number of tool cutting edges in
NCK).
Tools
The TO memory consists of tools numbered T1 to T32000.
Each tool can be set up via TOA files or individually, using the "New tool" soft key.
Compensation values not required must be assigned the value zero. (this is the default setting
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions