Abstract: A method and apparatus for controlling motion of power driven mechanisms in a medical x-ray spot filming system in order to minimize induced vibrations of x-ray film due to acceleration and deceleration of the power driven mechanisms. The invention includes a method and apparatus for establishing a desired profile of position of the x-ray associated mechanisms as a function of time and for implementing a move of the mechanism in accordance with the desired profile. In one form the profile is divided into a plurality of equal time increments and the motion of the mechanism is computed for each time increment as a function of a particular change in position such that a move can be completed within a fixed time interval. Depending upon the length of the move, a change in position for each time increment is determined and the mechanism is moved in accordance with the computed position change for each time increment.