Siemens SINUMERIK 840D Operating Manual page 374

Programming technological functions (cycles)
8.4 Turning - only for G code programs
Approach/retraction
1. Approach of the starting point determined in the cycle at the beginning of the run-in path
2. Infeed for roughing according to the defined infeed type.
3. Thread cutting is repeated according to the programmed number of roughing cuts.
4. The finishing allowance is removed in the following step with G33.
5. This cut is repeated according to the number of noncuts.
6. The whole sequence of motions is repeated for each further thread.
Procedure for thread chain
Parameters, G code program
PL Machining plane
SC Safety clearance
F Feedrate
Parameters
Machining
Infeed (only for ∇ and ∇
+ ∇∇∇)
Thread
X0
Z0
374
for the first thread with G0
1. The part program to be executed has been created and you are in the
editor.
2. Press the "Turning" softkey.
3. Press the "Thread" softkey.
The "Thread" input window opens.
4. Press the "Thread chain" softkey.
The "Thread Chain" input window opens.
mm
mm/min
Description
∇ (roughing)

∇∇∇ (finishing)

∇ + ∇∇∇ (roughing and finishing)

Linear:

Constant cutting depth infeed
Degressive:

Constant cutting cross-section infeed
Internal thread

External thread

Reference point X ∅ (abs, always diameter)
Reference point Z (abs)
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Unit
mm
mm
Milling