Siemens SINUMERIK 840D sl Function Manual page 1801

Selection of the cutting edge when changing tool
When a new tool (new T number) has been programmed and the old one replaced, the
following options are available for selecting the cutting edge:
• The cutting edge number is programmed.
• The cutting edge number is defined by the machine data:
Value
= 0
< > 0
= -1
Activating the tool compensations
D1 to D9 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
• Tool radius compensation (TRC) becomes active when G41/G42 is programmed in the
2.1.2 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).
Basic logic functions: Tool Offset (W1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
MD20270 $MC_CUTTING_EDGE_DEFAULT (Basic setting of tool cutting edge without
programming)
Significance
No automatic cutting edge selection in accordance with M06
Number of the cutting edge, which is selected in accordance with M06
The cutting edge number of the old tool is retained and is also selected for the new tool, in
accordance with M06.
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.
active plane (G17, G18 or G19).
The selection of tool radius compensation with G41/G42 is only permitted in a program
block with G0 (rapid traverse) or G1 (linear interpolation).
Detailed Description
2.1 Tool
13