in step 350 nozzle 15 is moved to the z coordinate of the surface of the device and the vacuum is activated in step 355 in step 360 the nozzle is moved so that the device is within the field of view of the laser align system for example in one embodiment nozzle 15 is moved to a z position roughly equal to half of the thickness of the device in step 365 an align routine is used to determine the distance from the center of the device to the center of its rotation i e the center of nozzle 15 in x and y and to determine the angle between the device and the system 39 s x axis an embodiment of an align process is illustrated in fig5 a and 5 b and will be described in more detail below briefly the laser align unit takes measurements as the device is rotated for example one or more sensors monitor which of one or more laser beams is interrupted during a rotation of the device at any given time the image can be characterized by a width and a center position the laser align unit identifies the four positions corresponding to the four sides of the device at which the image exhibits local width minima and returns the center position associated with each of the four positions using these four center coordinates the software is able to compute a correcting move for the x y and angle coordinates.