Siemens SINUMERIK 840D sl Operating Manual page 720

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Working with Manual Machine

14.6 More complex machining

Thread cutting

In addition to the functions that are made available by "thread-cutting" under Automatic, you

can insert idle cuts during the machining process under "Manual Machine."

You can interrupt the infeed of the cutting depth during the machining process by inserting

idle cuts, in order to smooth the flanks for example.

Thread re-machining

You can rework existing threads, when repairing previously cut threads for example or as the

result of changes that arise from re-measuring (see Section "Auto-Hotspot").

If you want to rework some threads, input the initial plunge depth E (inc.). This is the depth

that was reached during a previous machining.

By inputting the plunge depth, you avoid unnecessary idle cuts when reworking the threads.

Sinumerik 828d turning