Siemens SINUMERIK 840D sl Programming Manual page 166

Measuring variants
2.3 Measure workpiece (milling)
Calculating and activating the swivel data sets
After measuring the three ball positions that are required in each case for all the relevant
rotary axes, the entire set of swivel data sets can be calculated by means of CYCLE996.
CYCLE996 should be parameterized and called for this purpose.
Correction target
In the "Calculate kinematics" screen form, in the "offset target" field, for the vectors it can be
set as to whether "only" a calculation should be made (only measuring) or whether the
calculated vectors should be saved in the swivel data set. Before saving, the user can decide
whether the calculated swivel data set should be displayed and changed. If the calculated
swivel data set should not be displayed, the user can decide whether the swivel data set
should be immediately overwritten. In all other cases, before saving the swivel data set, the
operator is prompted to make a selection.
Table 2- 28
Parameters
Display data set
Data set can be edited
Confirm the change
- entry field is not displayed
In addition, the swivel data set can be saved as protocol file ("save data set").
The protocol file is saved in the actual NC data path (or workpiece) in which the
measurement program is running. The file name corresponds to the name of the swivel data
set, and is generated with a count index "_M1" to "_M99".
The protocol file contains the syntax of the parameters of the swivel data set of the NC
function TCARR, e.g. :
$TC_CARR1[1]=-426.708853 $TC_CARR2[1]=-855.050806 ... ;I1xyz.
If a transformation type <> 72 is set in the machine data for the dynamic transformation
(TRAORI), the calculated vectors are saved in the protocol file also as machine data.
Tolerance limits
Activating tolerance limits when parameterizing CYCLE996 (compare output values and
calculated values), allows conclusions to be drawn as regards unusual changes in the
mechanical kinematic chain. The unintentional automatic overwriting of output values can be
avoided by adjusting the tolerance limits.
The rotary axis vectors V1/V2 (orientation of the rotary axes) are never automatically
overwritten.
166
Display options in the "Calculate kinematics" screen form
CAUTION
Measuring only
Yes No
- -
- -
Programming Manual, 02/2011, 6FC5398-4BP40-0BA0
Swivel data set
No Yes
- Yes/no
Yes/no -
Measuring cycles