Thread Milling (Cycle70) - Siemens SINUMERIK 840D sl Operating Manual

Programming technology functions (cycles)
10.4 Milling
Parameter Description
The positions refer to the reference point:
X0 Reference point X – (for single position only)
Y0 Reference point Y – (for single position only)
Z0 Reference point Z
L Elongated hole length
α0 Angle of rotation
Z1 Elongated hole depth (abs) or depth in relation to Z0 (inc)
DZ Maximum depth infeed
FZ Depth infeed rate
* Unit of feedrate as programmed before the cycle call
10.4.11

Thread milling (CYCLE70)

Function
Using a thread cutter, internal or external threads can be machined with the same pitch.
Threads can be machined as right-hand or left-hand threads and from top to bottom or vice
versa.
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 selection must be activated via a machine data code.
The entered feedrate acts on the workpiece contour, i.e. it refers to the thread diameter.
However the feedrate of the cutter center point is displayed. That is why a smaller value is
displayed for internal threads and a larger value is displayed for external threads than was
entered.
Approach/retraction when milling internal 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
traverse.
4. Approach motion to thread diameter on an approach circle calculated internally in the
controller with the programmed feedrate, taking into account the finishing allowance and
maximum plane infeed.
494
Machine manufacturer
Please refer to the machine manufacturer's specifications.
Unit
mm
mm
mm
mm
Degrees
mm
mm
*
Operating Manual, 05/2017, A5E40868721
Turning