HEIDENHAIN ITNC 530 User Manual page 502

Selection of alternate tilting possibilities: SEQ +/
– (entry optional)
The position you define for the machining plane is used by the TNC to
calculate the appropriate positioning of the rotary axes present on the
machine. In general there are always two solution possibilities.
Use the SEQ switch to specify which possibility the TNC should use:
SEQ+ positions the master axis so that it assumes a positive angle.
The master axis is the 2nd rotary axis from the table, or the 1st axis
from the tool (depending on the machine configuration (see figure at
top right)).
SEQ– positions the master axis so that it assumes a negative angle.
If the solution you chose with SEQ is not within the machine's range of
traverse, the TNC displays the Entered angle not permitted error
message.
If you do not define SEQ, the TNC determines the solution as follows:
1 The TNC first checks whether both solution possibilities are within
the traverse range of the rotary axes.
2 If they are, then the TNC selects the shortest possible solution.
3 If only one solution is within the traverse range, the TNC selects
this solution.
4 If neither solution is within the traverse range, the TNC displays
the Entered angle not permitted error message.
Example for a machine with a C rotary table and an A tilting table.
Programmed function: PLANE SPATIAL SPA+0 SPB+45 SPC+0
Starting
Limit switch
position
None A+0, C+0
None A+0, C+0
None A+0, C+0
None A+0, C–105
None A+0, C–105
None A+0, C–105
–90 < A < +10 A+0, C+0
–90 < A < +10 A+0, C+0
None A+0, C–135
502
Resulting
SEQ
axis position
not prog. A+45, C+90
+ A+45, C+90
– A–45, C–90
not prog. A–45, C–90
+ A+45, C+90
– A–45, C–90
not prog. A–45, C–90
+ Error message
+ A+45, C+90
9 Programming: Special Functions