Program Header - Siemens SINUMERIK 840D Operating Manual

7.5

Program header

In the program header, set the following parameters, which are effective for the complete
program.
Parameter
Measurement unit
Work offset
Blank
XA
N
SW / L
W
L
X0
Y0
X1
Y1
XA
XI
ZA
ZI
PL
Retraction plane RP
Safety clearance SC:
Milling
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Description
The dimension unit (mm or inch) set in the program header only refers to the
position data in the actual program. All other data, such as feedrate or tool offsets,
are entered in the dimension unit that you have set for the entire machine.
The work offset in which the workpiece zero is saved.
You can also delete the pre-setting of the parameter if you do not want to specify a
work offset.
Define the form and dimensions of the workpiece
Cylinder

Outer diameter ∅
Polygon

Number of edges
Width across flats
Edge length
Centered cuboid

Width of blank
Length of blank
Cuboid

1. Corner point X
1. Corner point Y
2. Corner point X (abs) or 2nd corner point X referred to X0 (inc)
2. Corner point Y (abs) or 2nd corner point Y referred to Y0 (inc)
Tube

Outer diameter ∅
Inner diameter ∅ (abs) or wall thickness (inc)
Initial dimension
Final dimension (abs) or final dimension in relation to ZA (inc)
Machining plane
G17 (XY)
G18 (ZX)
G19 (YZ)
Note: The plane settings can already be defined. Ask the machine manufacturer in
order that the selection box is available.
Planes above the workpiece.
During machining the tool travels in rapid traverse from the tool change point to the
return plane (RP) and then to the safety clearance (SC). The machining feedrate is
activated at this level. When the machining operation is finished, the tool travels at
the machining feedrate away from the workpiece to the safety clearance level. It
travels from the safety clearance to the retraction plane and then to the tool change
point in rapid traverse. The retraction plane is entered as an absolute value.
The safety clearance must be entered as an incremental value (without sign).
Creating a ShopMill program
7.5 Program header
Unit
mm
inch
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
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