Thread Turning (Cycle99) - Siemens SINUMERIK 840D sl Operating Manual

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* Unit of feedrate as programmed before the cycle call

Thread turning (CYCLE99)

The "Longitudinal thread", "Tapered thread" or "Face thread" cycle is used to turn external or

internal threads with a constant or variable pitch.

There may be single or multiple threads.

For metric threads (thread pitch P in mm/rev), the cycle assigns a value (calculated on the

basis of the thread pitch) to the thread depth H1 parameter. You can change this value.

The default must be activated via setting data SD 55212

$SCS_FUNCTION_MASK_TECH_SET.

The cycle requires a speed-controlled spindle with a position measuring system.

Interruption of thread cutting

You have the option to interrupt thread cutting (for example if the cutting tool is broken).

1. Press the <CYCLE STOP> key.

2. Replace the tool and press the <CYCLE START> key.

Thread re-machining

You have the option of subsequently machining threads. To do this, change into the "JOG"

operating mode and carry out a thread synchronization.

Operating Manual, 03/2013, 6FC5398-8CP40-3BA1

Insertion angle

Cross feed ∅ (abs) or cross feed (inc) - (only for ∇∇∇ and ∇ + ∇∇∇)

Maximum depth infeed – (only for ∇ and ∇ + ∇∇∇)

Finishing allowance in X or finishing allowance in X and Z – (only for ∇ and ∇ +

Finishing allowance in Z – (only for UZ, ∇ and ∇ + ∇∇∇)

Machine manufacturer

Please refer to the machine manufacturer's specifications.

The tool is retracted from the thread and the spindle is stopped.

The aborted thread cutting is started again with the interrupted cut at the same depth.

Programming technology functions (cycles)

Sinumerik 828d turning