Siemens SINUMERIK 828D Operating Manual page 269

5. Thread cutting along a spiral path in clockwise or counterclockwise direction (depending
6. Exit motion along a circular path in the same rotational direction at programmed feedrate.
7. With a programmed number of threads per cutting edge NT > 2, the tool is fed in (offset)
8. If the plane infeed is less than the thread depth, points 3 to 7 are repeated until the thread
9. Retract on the thread center point and then to retraction plane in the tool axis in rapid
Please note that when milling an internal thread the tool must not exceed the following value:
Milling cutter diameter < (nominal thread diameter ∅ - 2 · thread depth H1)
Approach/retraction when milling external threads
1. Positioning on retraction plane with rapid traverse.
2. Approach of starting point of the approach circle in the current plane with rapid traverse.
3. Infeed to a starting point in the tool axis calculated internally in the controller with rapid
4. Approach motion to thread core diameter on an approach circle calculated internally in
5. Cut thread along a spiral path in clockwise or counterclockwise direction (depending on
6. Exit motion along a circular path in opposite rotational direction at programmed feedrate.
7. With a programmed number of threads per cutting edge NT > 2, the tool is fed in (offset)
8. If the plane infeed is less than the thread depth, points 3 to 7 are repeated until the thread
9. Retraction on the retraction plane in the tool axis with rapid traverse.
Procedure
HMI sl Milling
Operating Manual, 06/2009, 6FC5398-7CP20-0BA0
on whether it is left-hand/right-hand thread, for number of cutting teeth of a milling plate
(NT) ≥ 2 only 1 rotation, offset in the Z direction).
by the amount NT-1 in the Z direction. Points 4 to 7 are repeated until the programmed
thread depth is reached.
depth + programmed allowance is reached.
traverse.
traverse.
the controller with the programmed feedrate, taking into account the finishing allowance
and maximum plane infeed.
whether it is left-hand/right-hand thread, with NT ≥ 2 only one rotation, offset in Z
direction).
by the amount NT-1 in the Z direction. Points 4 to 7 are repeated until the programmed
thread depth is reached.
depth + programmed allowance is reached.
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.
Programming technological functions (cycles)
8.2 Milling
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