July 2013 6.5 Tilting and swivel axes 771
Miscellaneous
function M128,
TCPM
Automatic compensation with M128 or TCPM:
Linear and rotational movements are superimposed. The resulting contour
deviations are compensated.
When the table is rotated, the coordinate system is rotated against the
machine coordinate system. The iTNC takes this into account.
M128 and TCPM remain in effect even after a change in operating modes.
This means that the axis can be moved with the compensated machine
geometry in Manual mode with the axis direction keys, or in the El.
Handwheel mode.
With the miscellaneous function M118, the handwheel positioning
movements can be superimposed on the program run movements. The
iTNC automatically performs the compensating movements in the principal
axes.
A transitional element is inserted at non-tangential contour transitions when
positioning with rotary axes. However, W1026/W1104 (axes in position) is not
set and axes will not be clamped. This problem can be solved with M134
(exact stop at non-tangential contour transitions when positioning with rotary
axes):
Program M134 in the NC program or set MP7440 bit 6 = 1.
When M128 or TCPM are used, the principal axes make compensating
movements:
In MP7471, define the maximum velocity of the principal axes during
compensating movements. The speed for compensating movements with
M128 can also be limited via the PLC and the FMAX soft key, in addition to
MP7471.
MP7440 Output of M functions
Format: %xxxxxxx
Input: Bit 6 – Automatic activation of M134
0: M134 must be activated in the NC program
1: M134 is automatically activated when an NC program is
selected
MP7471 Maximum velocity of the principal axes during
compensating movements through M128 or TCPM
Input: 0 to 300 000 [mm/min]
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