Siemens SINUMERIK 840D sl Operation/Programming Manual page 205

08/2005
5
Linear: Infeed with constant cutting depth (for roughing only)
Degressive: Infeed with constant cutting cross-section (for roughing only)
Machining
type
Internal thread Inside thread
External Outside threads
thread
Reference point for dimensioning ¬ (abs)
X0
Z0 Reference point for dimensioning (abs)
Thread incline ¬ (abs or inc) – (for conical thread only)
X1/Xα
Incremental dimensions: The plus/minus sign is evaluated.
Thread length ¬ (abs) or thread length (inc) – (for face thread only)
X1
Incremental dimensions: The plus/minus sign is evaluated.
Z1 Thread length (abs or inc) – (only for longitudinal and conical threads)
Incremental dimensions: The plus/minus sign is evaluated.
W Thread advance (inc)
The starting point for the thread is the reference point (X0, Z0) displaced by the
thread advance distance W. The thread advance can be used if you wish to begin
the individual cuts slightly earlier in order to produce a precise start of thread too.
W2 Thread run-in (inc)
The thread run-in can be used if you cannot approach the thread from the side but
have to insert the tool into the material (e.g. lubrication groove on a shaft).
W2=R Thread run-in = thread run-out (inc)
R Thread run-out (inc)
The thread run-out can be used if you wish to retract the tool obliquely at the end of
the thread (e.g. lubrication groove on a shaft).
K Thread depth (inc)
If the value is calculated by ShopTurn, the field is displayed with a gray background.
The value can still be changed, however, in which case the field is displayed with a
white background again.
The programmed final machining allowance U is subtracted from the preset thread
depth K and the remainder is segmented into a number of roughing cuts. The cycle
automatically calculates the individual current infeed depths as a function of the
specified cut segmentation.
α
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 angles to cutting direction
If you wish to infeed along the flanks, the absolute value for this parameter must not
exceed half the flank angle of the tool.
I Infeed slope as flank (inc) – alternative to infeed slope as angle
I > 0: Infeed along the rear flank
I < 0: Infeed along the front flank
Infeed along the flank
Infeed with alternate flanks (alternative)
Instead of infeeding along one flank, you can also infeed along alternate flanks to
avoid always loading the same tool cutting edge and increase the tool life.
α > 0: Start at rear flank
♥ Siemens AG, 2005. All rights reserved
SINUMERIK 840D sl Operation/Programming ShopTurn (BAT) – 08/2005 Edition
Roughing
Finishing
+ Complete machining
ShopTurn Functions
5
5.3 Turning
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