6 – 114 HEIDENHAIN Technical Manual TNC 426, TNC 430
Please note:
At high feed rates (e.g. rapid traverse) a higher jerk is permitted than at low
feed rates:
7
77
7 Enter the jerk for low feed rates in MP1090.0, and for high feed rates in
MP1090.1. MP1090 is the jerk on the tool path. The input value is
determined by the weakest axis.
7
77
7 In MP1092, define a machining feed rate beginning at which MP1090.1
becomes effective.
A nominal position value is acquired every 3 ms from the calculated velocity.
For linear interpolation:
s = nominal position value
s
o
= previous nominal position value
v = calculated velocity
∆t = cycle time (3 ms)
The nominal position value is resolved into the individual axis components,
depending on which axes have been programmed.
It may happen that the axes at first move past the target position and then
oscillate onto it. This overshoot behavior during acceleration and braking can
be influenced by a time constant:
7
77
7 In MP1521, define the time constant for the overshoot behavior.
Jerk
a²
v
-----
≥
ss
o
v ∆t⋅+=
Input value correct
Input value too small
Input value too large
Acceleration
(MP1060.x)
MP1521
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