a missed pick because of the vacuum nozzle inspection and calibration on the fly during the placement cycle there is no slowdown of the placement machine cycle rate application_number US 62792703 A description the present invention pertains to calibration of vacuum nozzle positions on the multi head rotatable frame of a component placement machine used for assembling printed circuit boards referring to fig1 a schematic view of a housing 102 having a multi pick place head frame 104 rotatably mounted therein is shown a plurality of pick place heads 106 having vacuum spindles 108 are disposed radially around the frame 104 it will be recognized by those skilled in the component placement machine arts that a frame 104 may carry any number of pick place heads 106 disposed radially about its perimeter for purposes of this disclosure a general case of n pick place heads 106 is discussed multi pick place head frames 104 are known and the concept forms no part of the present invention exemplary multi pick place head frames are described in u s pat no re 35 027 and european patent no ep 0 315 799 fig2 is a schematic block diagram 200 of a typical image acquisition arrangement for use in a component placement machine at least one camera 202 is used to capture images often at different magnifications or with different lighting conditions the output of the camera 202 is connected to electronic signal processing.