5
08/2005 ShopTurn Functions
5.2 Drillin
5
♥ Siemens AG, 2005. All rights reserved
SINUMERIK 840D sl Operation/Programming ShopTurn (BAT) – 08/2005 Edition 5-177
5.2.6 Thread milling
The "Thread milling" function is used when you want to mill an internal
or external thread on the end face.
For metric threads (thread pitch P in mm/rev) ShopTurn assigns a
value calculated from the thread pitch to the Thread depth K
parameter. You can change this value.
The default selection must be activated via a machine data code.
Please also refer to the machine manufacturer's instructions.
You can mill a right-hand thread or a left-hand thread.
Inside thread
1. The tool is moved at rapid traverse to the thread center point on
the return plane, and then to the safety clearance.
2. The tool describes an approach circle calculated by the control and
then approaches the thread diameter at the programmed feedrate
along a helical path.
3. The thread is cut along a helical path in clockwise or
counterclockwise direction (depending on whether it is a left-hand
or right-hand thread).
4. The tool is retracted from the workpiece along a helical path at the
programmed feedrate.
5. The tool moves back to the safety clearance at rapid traverse.
Outside threads
1. The tool is moved at rapid traverse to the starting point on the
return plane, and then to the safety clearance.
2. The tool describes an approach circle calculated by the control and
then approaches the thread diameter at the programmed feedrate
along a helical path.
3. The thread is cut along a helical path in clockwise or
counterclockwise direction (depending on whether it is a left-hand
or right-hand thread).
4. The tool is retracted from the thread along a helical path at the
programmed feedrate.
5. The tool moves back to the safety clearance at rapid traverse.
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