Siemens SINUMERIK 840D, Operating Manual

Page: 321 / 610

Programming technological functions (cycles)
8.2 Milling
Milling
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
321
Procedure
1. The part program or ShopMill program to be processed has been
created and you are in the editor.
2. Press the "Milling" softkey.
3. Press the "Thread milling" softkey.
The "thread milling" input window opens.
Parameters, G code program Parameters, ShopMill program
PL Machining plane T Tool name
Milling direction D Cutting edge number
RP Retraction plane mm F Feedrate mm/min
mm/rev
SC Safety clearance mm S / V Spindle speed or constant
cutting rate
rpm
m/min
F Feedrate mm/min
Parameters Description Unit
Machining 
∇ (roughing)

∇∇∇ (finishing)
Machining direction:

Z0 → Z1
Machining from top to bottom

Z1 → Z0
Machining from bottom to top
Direction of rotation of the thread:

Right-hand thread
A right-hand thread is cut.

Left-hand thread
A left-hand thread is cut.
Position of the thread:

Internal thread
An internal thread is cut.

External thread
An external thread is cut.
NT Number of teeth per cutting edge
Single or multiple toothed milling inserts can be used. The motions required are
executed by the cycle internally, so that the tip of the bottom tooth on the milling insert
corresponds to the programmed end position when the thread end position is reached.
Depending on the cutting edge geometry of the milling insert, the retraction path must
be taken into account at the base of the workpiece.