Selection Of Tilting Possibilities Sym (Seq) - HEIDENHAIN TNC 620 User Manual

11
Selection of tilting possibilities SYM (SEQ) +/–
Based on the position that you have defined for the working plane,
the control must calculate the appropriate position of the rotary axes
present on your machine. In general, there are always two possible
solutions.
For the selection of one of the possible solutions, the control offers
two variants: SYM and SEQ. You use soft keys to choose the variants.
SYM is the standard variant.
The entry of SYM or SEQ is optional.
SEQ assumes that the master axis is in its home position (0°).
Relative to the tool, the master axis is the first rotary axis, or the
last rotary axis relative to the table (depending on the machine
configuration). If both possible solutions are in the positive or
negative range, then the control automatically uses the closer
solution (shorter path). If you need the second possible solution,
then you must either pre-position the master axis (in the area of the
second possible solution) before tilting the working plane, or work
with SYM.
As opposed to SEQ, SYM uses the symmetry point of the master
axis as its reference. Every master axis has two symmetry positions,
which are 180° apart from each other (sometimes only one
symmetry position is in the traverse range).
Determine the symmetry point as follows:
Perform PLANE SPATIAL with any spatial angle and
SYM+
Save the axis angle of the master axis in a
Q parameter (e.g., –80)
Repeat the PLANE SPATIAL function with SYM-
Save the axis angle of the master axis in a
Q parameter (e.g., –100)
Calculate the average value (e.g., –90)
The average value corresponds to the symmetry point.
Reference for SEQ
SEQ–
With the SYM function, you select one of the possible solutions
relative to the symmetry point of the master axis:
SYM+ positions the master axis in the positive half-space relative
to the symmetry point
SYM- positions the master axis in the negative half-space relative
to the symmetry point
454
Multiple-axis machining | The PLANE function: Tilting the working plane (option 8)
Reference for SYM
SYM–
SEQ+
SYM+
HEIDENHAIN | TNC 620 | Klartext Programming User's Manual | 01/2022