Hello First let me state that I work for an AOI vendor. I will not reference any particular brand of AOI.
When considering AOI you need to ask your self several questions. These are in no particular order.
What is you product mix (IE High mix low volume or low mix high volume)? this can be the determining factor for your purchase. Some machines take longer to program but with that can give better features and defect capture capability.
Do you need a multi camera machine, And what does it buy you? And is it cost/time effective. (how much extra programming and debug does it add)
Are you looking for price being your driving factor or is it performance?
How easy it is to program and how long does it take to program. Also do the quoted programming times include how long it takes to actually get the program usable for production inspection (Debugging). IE with a low false call rate and how easy is it to deal with part variation and alternate vender updates to the program.
Also be careful of advice. AOI developments are fast paced and the machine you or the advisor saw 2 years ago may have improved dramatically or sat stagnant.
Look at what each vendor has to offer in after sales service, Training, support warrantee and reliability.
And make sure you compare apples to apples. Make a comparison table for both features and price. And lastly get a demo on each machine in you facility and get them to run a set of boards with your hot points for inspection on it. That you supply the boards when they arrive.
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