A rotary hammer includes a motor, a spindle coupled to the motor for receiving torque, a piston received within the spindle for reciprocation, a striker received within the spindle for reciprocation in response to reciprocation of the piston, and an anvil received within the spindle and positioned between the striker and the tool bit. The anvil imparts axial impacts to the tool bit in response to reciprocation of the striker. A reciprocation mechanism is coupled to the motor to reciprocate the piston along a reciprocation axis. The reciprocation mechanism includes a camshaft fixedly coupled to the piston, a cam groove in the camshaft, a cam ball received by the cam groove, and a rotatable hub on which the cam ball is carried. The rotatable hub is configured to receive torque from the motor and reciprocate the camshaft in response to relative rotation between the cam ball and the camshaft.