POWER TOOL WITH EXCHANGEABLE REDUCTION GEARING UNIT.

摘要

A power tool comprises a power unit (10) with a rotation motor, and a reduction gearing, wherein the reduction gearing comprises a set of interchangeable gearing units (16 a-c) attachable one at a time to the power unit (10) and having all different operational characteristics like different total gear ratio and torque capacity. Each gearing unit has an electronic identification device (48) programmed with data specific for each gearing unit, such as total gear ratio, torque range, and relating to compatibility of the gearing unit with a certain power unit. The power unit (10) comprises an electronic operation control means programmed with a number of different operation parameter sets each intended for a specific one of the gearing units (16 a-c), and a circuit for communicating with a gearing unit attached to the power unit to determine whether there is compatibility and which parameter set is applicable.