Backlash Compensation; Mechanical Backlash Compensation; Description Of Functions - Siemens SINUMERIK 840D sl Function Manual

Extended functions

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SD43910 $SA_TEMP_COMP_SLOPE = 0.000132

Backlash compensation

Mechanical backlash can occur in a drive train involving moved machine parts (machine axes),

e.g. at the ballscrew or in conjunction with the measuring system.

For a machine axis with indirect measuring system, mechanical backlash results in a difference

between the actual position of the NC determined using the measuring system and the actual

position of the machine part. When the direction reverses, the machine axes traverse through

a distance that is incorrect by the amount of the backlash:

The encoder actual value leads the machine

The table does not move far enough because

the encoder actual value has already changed

(leading) due to the backlash while the table

still remains stationary.

Compensation

To compensate for the mechanical backlash, the actual value of the machine axis is corrected

every time the axis reverses by the axis-specific compensation value set during

Commissioning: Axis-specific machine data (Page 260).

Extended Functions

Function Manual, 10/2015, 6FC5397-1BP40-5BA3

Positive backlash ⇒

actual value

5.3 Backlash compensation

Negative backlash ⇒

The encoder actual value lags behind the ma‐

chine actual value

The table moves too far because the encoder

actual value has not yet changed (lagging) due

to the backlash while the table is already mov‐

moved machine part (table

mechanical backlash

K3: Compensations

Sinumerik 828d