Siemens SINUMERIK 840D sl Operating Manual page 634

Working with two tool carriers
15.1 Programming with two tool carriers
The programmed C offset around 180° only affects C axes, not spindles.
It is not possible to machine a thread with tools that are distributed between both tool
holders.
G code programming
The following points must be taken into account for G code programming:
● After a tool change, tool mirroring on the second tool holder is automatically activated.
● When a TRANSMIT command is programmed, tool mirroring on the second tool holder is
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automatically activated.
Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
Turning