Siemens SINUMERIK 840Di Function Manual page 1683

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 predefined using machine data:
= 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 Offset memory structure
Tool compensation memory size
Each channel can have a dedicated tool compensation memory (TO unit).
Machine data:
MD28085 $MC_MM_LINK_TOA_UNIT (assignment of TO unit to a channel)
is set to define the TO memory, which exists for the appropriate channel.
The maximum number of cutting edges for all tools managed by the NCK
is set with machine data:
MD18100 $MN_MM_NUM_CUTTING_EDGES_IN_TOA
(number of cutting edges in the NCK).
Tool Compensation (W1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
MD20270 $MC_CUTTING_EDGE_DEFAULT:
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, tool
length compensation is applied with the first axis motion, in which it is operative.
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
2-3