Siemens SINUMERIK 828D Operating Manual page 370

Computerized numerical controller for machine tools
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Programming technology functions (cycles)
9.2 Rotate
Parameter
or
αP
D0
D1 or ND
(only for ∇ and
∇ + ∇∇∇)
U
NN
VR
Multiple threads
370
Description
Infeed slope as angle – (alternative to infeed slope as flank)
α > 0: Infeed along the rear flank
α < 0: Infeed along the front flank
α = 0: Infeed at right angle to cutting direction
If you wish to infeed along the flanks, the maximum absolute value of this parame-
ter may be half the flank angle of the tool.
Infeed along the flank
Infeed with alternating flanks (alternative)
Instead of infeed along one flank, you can infeed along alternating flanks to avoid
always loading the same tool cutting edge. As a consequence you can increase
the tool life.
α > 0: Start at the rear flank
α < 0: Start at the front flank
Initial plunge depth – (only for ∇ and ∇ + ∇∇∇ under "Manual Machine")
If you want to rework some threads, input the initial plunge depth D0 (inc.). This is
the depth that was reached during a previous machining.
By inputting the plunge depth, you avoid unnecessary idle cuts when reworking
the threads.
First infeed depth or number of roughing cuts
The respective value is displayed when you switch between the number of rough-
ing cuts and the first infeed.
Finishing allowance in X and Z – (only for ∇ and ∇ + ∇∇∇)
Number of noncuts - (only for ∇∇∇ and ∇ + ∇∇∇)
Return distance (inc)
No
α0
Starting angle offset
Yes
N
Number of thread turns
The thread turns are distributed evenly across the periphery of the
turned part; the 1st thread turn is always located at 0°.
DA
Thread changeover depth (inc)
First machine all thread turns sequentially to thread changeover
depth DA, then machine all thread turns sequentially to depth 2 ·
DA, etc. until the final depth is reached.
DA = 0: Thread changeover depth is not taken into account, i.e.
finish machining each thread before starting the next thread.
Machining:
Complete, or
From turn N1
N1 (1...4) start thread N1 = 1...N
Only thread NX
NX (1...4) 1 from N threads
or
Operating Manual, 01/2015, 6FC5398-8CP40-5BA2
Unit
Degrees
mm
mm
mm
mm
Degrees
mm
Turning

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