Siemens SINUMERIK 840D sl Programming Manual page 782

Work preparation
3.13 Tool offsets
Further information
Resolved kinematics
For machines with resolved kinematics (both the tool as well as the workpiece can be rotated),
the system variables have been expanded by the entries $TC_CARR18[m] up to
$TC_CARR23[m] and are described as follows:
The rotatable tool table consisting of:
● The vectorial clearance of the second rotary axis V
can be rotated I
The rotary axes consisting of:
● The two channel identifiers for the reference of the rotary axes V
when required, accessed to determine the orientation of the toolholder that can be
orientated.
The type of kinematics with one of the values T, P or M:
● Kinematics type T: Only tool can rotate.
● Kinematics type P: Only part can rotate.
● Kinematics type M: Tool and part can rotate.
Clearing the toolholder data
Data of all toolholder data sets can be deleted using $TC_CARR1[0]=0.
The kinematic type $TC_CARR23[T]=T must be assigned with one of the three permissible
uppercase or lowercase letters (T,P,M) and for this reason, should not be deleted.
Changing the toolholder data
Each of the described values can be modified by assigning a new value in the part program.
Any character other than T, P or M results in an alarm when an attempt is made to activate the
toolholder that can be orientated.
Reading the toolholder data
Each of the described values can be read by assigning it to a variable in the part program.
Fine offsets
An illegal fine offset value is only detected if a toolholder that can be orientated is activated,
which contains such a value and at the same time setting data
SD42974 $SC_TOCARR_FINE_CORRECTION = TRUE.
The maximum permissible fine offset is limited to a permissible value in the machine data.
782
of the third rotary axis.
4
to the reference point of a tool table that
2
and V
1
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
, whose position is,
2
NC programming