a handpiece body 30 for housing a power device 32 such as an electric motor coupled to an electrical power connector 36 for driving a drive shaft 38 although this embodiment describes an electrically powered apparatus it is understood that alternative power devices may be selected including pneumatic battery or gas powered devices these alternative power devices may be supported by additional or alternative components the coupling mechanism 26 may be provided to convert and control if needed the motion from the power device 32 into a vibratory reciprocating oscillatory or other type of direction alternating movement the coupling mechanism 26 may include a body 40 for housing a drive mechanism 42 for transferring output motion to the implant adapter 28 the drive mechanism 42 may be connected to a conversion mechanism 44 such as one or more cams for creating reciprocating motion the coupling mechanism 26 may further include a reduction mechanism 46 such as a gearbox connected to the conversion mechanism 44 and or the drive mechanism 42 for selectively altering the speed and or force transmitted by the drive mechanism 42 the coupling mechanism 26 may also include a drive mechanism 48 for transmitting motion from the handpiece 24 the coupling mechanism 26 may include additional or alternative mechanisms as may be necessary to convert and control the motion from the power device 32 into a desired output motion u s pat no 6 610 066 which is incorporated by reference herein discloses a reciprocating surgical tool having components for converting rotary motion of.