Run The Circular Test - HEIDENHAIN TNC 426 PB/M Technical Manual

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12. Run the circular test:

With the circular test you can check the exact input values for compensating
sliding friction:
7 7 7 7
Determine the radial acceleration:
MP1070 = 0.7 · MP1060.x
MP1060.x represents the smallest acceleration in the working plane.
7 7 7 7 At mid-range feed rate (approx. 500 mm/min) check the parameter MP2610.
At the optimum setting the reversal peaks are at a minimum.
At feed rates greater than approx. 6000 rpm the reversal peaks might point
inward as a result of overcompensation:
7 7 7 7 In this case, increase MP2612.x until the reversal peaks no longer point
inward.
HEIDENHAIN Technical Manual TNC 426, TNC 430