HEIDENHAIN MANUALplus 620 Technical Manual page 909

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Compensation of

reversal peaks

January 2012

For adjusting the compensation of the reversal peaks, proceed as follows:

Set machine parameters MP_compFFAdjust = 0 and MP_compRefAcc =

0 to ensure that the compensation strength is constant over all feed-rate

Now select a typical machining speed and adjust the MP_compStrength,

MP_compWidth and MP_compTimeOffset parameters for the selected

MP_compWidth specifies the duration of compensation and should contain

values in the range of a few microns.

In MP_compStrength specify the distance (in [mm]) which the axis will

travel if it ideally complies with the transferred nominal speed value. The

reversal peak height resulting without compensation is a suitable starting

value for the compensation.

In MP_compWidth, enter the duration of compensation. The value entered

should lie in the range of a few microns.

Set the parameter MP_compTimeOffset = 0.

Run a circular interpolation test.

If the path traversed in the circular test deviates at the reversal point from

the nominal path, first toward the inside and then toward the outside, the

compensation is performed too early. In this case, you must increase the

value in MP_compTimeOffset.

If the path traversed deviates at the reversal point from the nominal path,

first toward the outside and then toward the inside, the compensation is

performed too late. In this case, you must decrease the value in

MP_compTimeOffset.

With the following formula you can estimate the magnitude of useful values

for the MP_compTimeOffset parameter:

compTimeOffset

6.16 The Control Loop

acceleration