Hi everyone, I have some questions about local fiducial recognition from Quad4c mark 2. First a bit of background information. The local fiducials we are using are 1mm in diameter, and we are using a single fiducial per fine pitch part. The spindle runout is less than 4 mils. The upward and downward looking cameras have been calibrated and the downward looking camera is parallel to the y axis as is the upward looking camera. Now some information on the trials we have done. We have two products we have been trying to accurately place QFP100 parts (among other parts) on. These products are A and B. The A board has a HASL finish and we initially calibrated the Quad so that the placement of the QFP100 was satisfactory. While doing this calibration the image on the monitor was as follows: Draws two blue circles with a cross in the centre, when the fiducial is found the image shows the circles over the fiducial in a binary mode (i.e. the fiducial is white and the background is black). The B board has a gold finish. When parts were placed on this board (after we calibrated for the A board) the parts were off the pads significantly. The image of the local fiducials on the monitor was the same as described above. We then went and adjusted the lighting levels (changing the levels up and down but eventually leaving them as they were) at the CC and reran the B board. The result was a consistent failing of the local fiducials. The image whilst trying to find the fiducials can be described as follows: Draws a blue box with a cross in the centre. The system will search changing lighting levels and changing back and forth from binary mode to normal mode. Then we switched the machine off and reloaded the file. After we restarted the machine the results (while not perfect) were approaching an acceptable level. At this stage the fiducial image on the monitor was again different. It can be described as followed: Draws the two blue circles searching for the fiducial with a small blue cross at the centre. When the fiducial is found the image shows circles over the fiducial in a normal mode (i.e. the image did not turn binary at all). What we are having difficultly understanding is how the fiducial search algorithm appeared to change giving us the different results. Maybe someone can shed some light on this for us? We wish to use the correct algorithm, so can anyone describe what the algorithms are actually doing to help us better understand which one would be best to apply to our local fiducials? Also does anyone else use local fiducials on these machines? If so, are they being used successfully (i.e. is there still misplacement)? I look forward to any response. David David Simmons Production Engineer Tait Electronics Ltd 558 Wairakei Rd, PO Box 1645 Christchurch New Zealand Direct Phone: (64) (3) 358 6663 Fax: (64) (3) 358 3603 Cell (025) 228 7066 Email: [log in to unmask] http://www.tait.co.nz ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################