Conference: Main Conference
Forum: SMT Production & Design
Thread: SMT Production Tips Thread

Date: December 29, 2011 10:14 AM
Author: davef
Subject: SMT Production Tips

Darpy's offset checking trick: One trick I always use is to make the first two placements in every program the same as the fiducial data picked up from a dummy feeder. These two placements are generally skipped. ** If I do have a problem then I unskip them and do a fiducially corrected scan. ** If it reads the fids ok at fid correction but then doesn't go exactly to the center of the marks that are your two first mount data then your fid data is incorrect and so will everything else will be out. You can also use this method to do a very quick head offset check. Do the fid correction and tell the head you want head N to do the dry placement run (on the dummy placement fids ) if your camera scan has told you the fid data is OK. Eventually I will convince the world that the first two mount data should be your fid data but skipped. You can also check if there is any difference between the two. If there is then someone has changed the fid data, probably because they were too lazy to change the data origin to get the fids right in the middle of the camera/sensor. Bad set up also plays a part. [D Jarvis SMTnet]

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