6 – 482 HEIDENHAIN Technical Manual TNC 426, TNC 430
Determining the
acceleration
7
77
7 Clamp an object of maximum permissible weight on the machine table.
7
77
7 Enter the rapid traverse as step height.
7
77
7 During the step response, record the step response of the nominal velocity
value V (NOM RPM), the actual speed value V (ACT RPM), and the nominal
current value (I NOMINAL). It is permissible to limit the nominal current
value I NOMINAL during acceleration.
7
77
7 From the step response of the speed controller you determine the
maximum possible acceleration.
a: Acceleration [m/s
2
]
F
max
: Maximum machining feed rate (MP1010.x) [mm/min]
t
an
: Rise time [s]
7
77
7 Enter the maximum possible acceleration in MP1060.x.
Check the counting
direction
7
77
7 On the oscilloscope, set TRIGGER to FREE RUN.
7
77
7 To start recording:
7
77
7 Change to MANUAL operating mode.
7
77
7 Press the axis direction buttons.
7
77
7 Check the counting direction on the display and if necessary, correct it with
MP210.x.
F
max
t
an
66 000⋅
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