Siemens SINUMERIK 840D Operating Manual

Creating a ShopMill program
7.5 Program header
Milling
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
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7.5 Program header
In the program header, set the following parameters, which are effective for the complete
program.
Parameter Description Unit
Measurement unit 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.
mm
inch
Work offset 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.
Blank Define the form and dimensions of the workpiece
 Cylinder
XA Outer diameter ∅ mm
 Polygon
N Number of edges
SW / L Width across flats
Edge length
 Centered cuboid
W Width of blank mm
L Length of blank mm
 Cuboid
X0 1. Corner point X mm
Y0 1. Corner point Y mm
X1 2. Corner point X (abs) or 2nd corner point X referred to X0 (inc) mm
Y1 2. Corner point Y (abs) or 2nd corner point Y referred to Y0 (inc) mm
 Tube
XA Outer diameter ∅ mm
XI Inner diameter ∅ (abs) or wall thickness (inc) mm
ZA Initial dimension mm
ZI Final dimension (abs) or final dimension in relation to ZA (inc) mm
PL 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.
Retraction plane RP
Safety clearance SC:
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).

Siemens SINUMERIK 840D Specifications

General

Series	SINUMERIK 840D
Axes	Up to 31
Channels	Up to 10
Operating System	Windows-based
Power Supply	24 V DC
Control Unit Type	CNC
Interface	Ethernet, PROFIBUS
Display	TFT color display
Interpolation	Spline
PLC	Integrated PLC
Data Storage	CompactFlash, USB