Siemens SINUMERIK 840D sl, Function Manual

Page: 1892 / 2184

Detailed Description
2.5 Toolholder with orientation capability
Basic logic functions: Tool Offset (W1)
104
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Vectors, which describe offsets in the rotary head, are positive in the direction from the tool
tip to the reference point of the toolholder.
The following kinematic type is defined for machines with a rotary tool:
$TC_CARR23 using letter T
Machine with rotary workpiece
On machines with rotary workpiece, the vector l
1
has no significance. If it contains a value
other than zero, this is ignored.
The kinematic chain for machines with rotary workpiece is shown in the figure below.
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5HIHUHQFHSRLQWRI
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O
Y˞
Y˞
O
O
Figure 2-44 Kinematic chain to describe a rotary table
Vectors, which describe offsets in the rotary table, are positive in the direction from the
machine reference point to the table.
The following kinematic type is defined for machines with a rotary workpiece:
$TC_CARR23 using letter P
Note
On machines with rotary workpiece it is generally useful if the selected machine reference
point and the reference point of the table are identical. Selecting the reference points in this
way has the advantage that the position of the workpiece zero in the initial state (i.e., with
rotary axes not turned) does not change when the rotary table is activated. The (open)
kinematic chain (see figure) is then closed.
In this special case, therefore, the following formula applies: l
2
= - (l
3
+ l
4
)