A method and apparatus for performing a gap stack-up analysis for a machine gap. The bed typically has upstanding walls with upper surfaces that define a top of the bed. An input image of the object and the markers is acquired with a camera in a fixed physical relationship to a projector. The multiplexed log is maintained for multiple clients using a scaleable logging process. The rotor blade is accelerated by virtue of at least five repeated adjustment operations of the angle of attack about its longitudinal axis, wherein a rotor blade bending vibration with a vibration amplitude and a vibration frequency is excited.