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6.4.5 Compensation of Reversal Spikes during Circular Traverse
Calculation
6 – 46
The static friction in the axis bearings during circular movement can lead to
reversal spikes at the quadrant transitions. With the HEIDENHAIN KGM grid
encoder and the ACCOM evaluation software you can measure the size and
duration of the spikes.
Duration of the reversal spike:
Peak width [°] 2 π radius [mm] 60
----------------------------------------------------------------------------------------------------
t
[s]
=
SpD
360 [°] feed rate [mm/min]
The spike width is [°] displayed in the diagram. The feed rate [mm/min] is the
programmed tool path feed rate.
Compensation per control loop cycle time:
Reversal spikes [µm] control loop cycle time [s] 10
------------------------------------------------------------------------------------------------------------
Comp. [mm]
=
The compensation value is entered in MP712.x.
⋅
(
⋅
⋅
⋅
⋅
⋅
0,5 t
SpD
HEIDENHAIN Technical Manual TNC 426, TNC 430
)
-3
⋅
[s]
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