Patent ID: 11901852
Assignee: ROBERT BOSCH GMBH
Field: Machine tools (Mechanical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A method for detecting a transmission backlash in a hand-held power tool, the hand-held power tool comprising a drive motor that has a drive shaft, a tool spindle, and a transmission that, in respect of drive, connects the drive shaft to the tool spindle, the method comprising:
automatically rotating the drive shaft of the drive motor in one of a clockwise and a counter clock-wise direction upon at least one of switching on the hand-held power tool and following changing of a battery pack at least until a value of a first variable, representing a drag torque, is at least approximately constant;
monitoring a second variable which is associated with the rotation of the drive shaft of the drive motor during the rotation in the one of the clockwise and the counter clock-wise direction; and
determining a value of a third variable, representing a transmission backlash, based upon a change in the second variable during the rotation in the one of the clockwise and the counter clock-wise direction.