What are the main criteria in choosing an AOI system?
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What are the main criteria in choosing an AOI system?

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SMT inspection system

SMT inspection system

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What are the main criteria in choosing an AOI system? Document Transcript

  • 1. What are the main criteria in choosing an AOI system? If you're about to purchase an AOI system - what parameters or technical criteria are most important? There are many factors that go into choosing an AOI system. Which of them are most important really depends on your manufacturing needs. We can break them down into Optical, Software and Hardware capability. Optical Capability False Calls - good components that are marked No Good Escapes - NG components that the AOI machine misses Debug - the time you spend tweaking the AOI machine and playing the tolerance game All AOI machines should be able to inspect for presence, absence, skew, shift, polarity, OCV & short detection. However, most have a problem with inspecting solder joints. Many times the user turns solder inspection off due to False Calls, Escapes and Debug. The best machines extract the shape of the solder joint and correlate various points within the fillet to determine if it's Good or NG; exactly as we do when we manually inspect. Software Capability Programming Time - how long it takes to define components and program specific locations Program Consistency - repeatability of programs between users SPC - usable information to improve your process The best machines have intuitive programming and built-in templates. So when 2 different users create a program for the same board, the AOI machine produces the same result. Being able to use the information from AOI to improve your process is an added bonus. Hardware Capability Cycle Time - the time it takes to scan, review, classify, unload and load a second board Maintenance and Down Time The best way to start to determine what is important for you is to ask the question, "What do I want to inspect with AOI?" Cleve Williams AOI Applications Engineer EasyBraid Co