762 HEIDENHAIN Technical Manual iTNC 530 HSCI
Datums Closed-loop axes:
During "datum setting" for X, Y and Z, the datum is recalculated back to the
home position of the tilting element when "tilted working plane" is active (1).
So when "tilted working plane" is inactive and the tilting element is in its home
position, the tool is positioned at the datum set while "tilted working plane"
was active (2).
Behavior during datum setting can also be influenced via MP7500 bit 5:
MP7500 bit 5 = 0 (is entered in the kinematics description table)
During datum setting in X, Y and Z with an active tilted working plane, the
current rotary-axis coordinates are checked to see if they are correct for the tilt
angles, and with an inactive tilted working plane the rotary axes are checked
to see if they are at 0. For datum setting with an active tilted working plane,
the corresponding angles must be entered under 3-D ROT.
MP7500 bit 5 = 1 (is entered in the kinematics description table)
It can happen with titling elements with Hirth couplings that by locking the
Hirth coupling, the actual value of the encoder will no longer exactly agree with
the mechanical position of the tilting element. If this happens, the nominal
values should be used to calculate the various presets (MP7682 bit 1).
If problems continue to occur, MP7500 bit 5 should be set to 1. The checking
described in MP7500 bit 5 = 0 does not take place. The tilt angles entered
under 3-D ROT are used to calculate the datums in X, Y and Z.
With MP7682 bit 1 you define whether the nominal or the actual values are
used to calculate the presets during "datum setting" (is valid for MP7500 bit 5).
Also see “Special case: Reference-point setting with the PLANE function,
Hirth axes and M114" on page 763.
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