Siemens SINUMERIK 840D sl Operating Manual page 238

Creating a ShopTurn program
7.6 Program header
Parameters
ZRA
XRA
XRI
ZRA
ZRI
Tailstock
XRR
Tool change point
XT
ZT
SC
S
Mach. direction of
rotation
238
Description
Retraction plane Z front (abs) or
retraction plane Z referred to ZA (inc)
all

Retraction plane X external ∅ (abs) or
retraction plane X referred to XA (inc)
Retraction plane X internal ∅ (abs) or
retraction plane X referred to XI (inc)
Retraction plane Z front (abs) or
retraction plane Z referred to ZA (inc)
Retraction plant Z rear
Yes

No

Retraction plane tailstock – (only "Yes" for tailstock)
Tool change point, which must be approached by the revolver with its zero point.
Work (Workpiece Coordinate System)

Machine (Machine Coordinate System)

Notes
The tool change point must be far enough outside the retraction area that it is

not possible for any tool to protrude into the retraction area while the revolver is
moving.
Ensure that the tool change point is relative to the zero point of the revolver

and not the tool tip.
Tool change point X ∅
Tool change point Z
The safety clearance defines how close the tool can approach the workpiece in
rapid traverse.
Note
Enter the safety clearance without sign into the incremental dimension.
Spindle speed (maximum main spindle speed)
If you want to machine the workpiece with a constant cutting rate, the spindle
speed must be increased as soon as the workpiece diameter becomes smaller.
Since the speed cannot be increased at will, you can set a speed limit for the main
spindle (S1) and for the counter-spindle (S3), depending on the shape, size, and
material of the workpiece or collet.
The machine manufacturer only sets one speed limit for the machine, i.e. none
that are dependent on the workpiece.
Please refer to the machine manufacturer's specifications.
Milling direction
Conventional

Climbing

Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
Unit
rev/min
Turning