Siemens SINUMERIK Series Function Manual page 232

K3: Compensations
4.3 Backlash compensation
Effects
In the case of axes/spindles with indirect measuring systems, mechanical backlash falsifies
the traversing path. For example, when the direction of movement is reversed, an axis will
travel too much or too little by the amount of the backlash.
Positive backlash (normal case)
The encoder leads the machine part (e.g.
table). Since the actual position acquired by
the encoder also leads the real actual position
of the table, the table travels too short a
distance.
Compensation
To compensate for the mechanical backlash, the axis-specific actual value is corrected by
the axis-specific backlash amount specified when commissioning (MD32450, see
"Commissioning (Page 233)") every time the axis/spindle changes direction.
Activation
The mechanical backlash compensation is always active in all operating modes after
reference point approach.
Display
The compensation value that belongs to the current actual position is displayed in the
"Diagnostics" operator area of the "Axis/Spindle Service" window as the total compensation
calculated from LEC, mechanical and dynamic backlash compensation.
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Negative backlash
The encoder lags behind the machine part
(e.g. table). The table travels too far as the
actual position of the table leads the actual
position detected by the encoder.
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Extended Functions