Siemens SINUMERIK 840D

Programming technological functions (cycles)
8.4 Turning - only for G code programs
Milling
374 Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Approach/retraction
1. Approach of the starting point determined in the cycle at the beginning of the run-in path
for the first thread with G0
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
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.
Parameters, G code program
PL Machining plane
SC Safety clearance mm
F Feedrate mm/min
Parameters Description Unit
Machining
 ∇ (roughing)
 ∇∇∇ (finishing)
 ∇ + ∇∇∇ (roughing and finishing)
Infeed (only for ∇ and ∇
+ ∇∇∇)
 Linear:
Constant cutting depth infeed
 Degressive:
Constant cutting cross-section infeed
Thread
 Internal thread
 External thread
X0 Reference point X ∅ (abs, always diameter) mm
Z0 Reference point Z (abs) mm