Electronics Forum | Tue Oct 05 12:29:28 EDT 2010 | mikesewell
It is possible to infer that the lead is lifted based on the toe fillet appearance, but it's not as reliable as say a laser or xray inspection. This is usually done by varying the light source location and or color and looking at the images resultin
Electronics Forum | Wed Sep 29 16:04:29 EDT 2010 | hegemon
In my experience, the best way to do a lifted lead inspection on a QFP is by laser height measurement. It is very difficult to consistently catch a lifted lead with only a top down camera. As you say, too many false calls, and still some escapes.
Electronics Forum | Sat Oct 02 15:26:59 EDT 2010 | rway
Possible, but difficult. What algorithm programs are you referring to? Mirtec and YesTech both utilize algorithms in their respective software. The algorithm is simply a series of instructions to perform the inspection. In this case, rules-based,
Electronics Forum | Tue Oct 05 02:57:41 EDT 2010 | patejl
Reese is right. We use algorithm our AOI but the make it find liftead lead on qfp or such... it took me all day to set program and even then some defects pass so that is why Im asking..
Electronics Forum | Thu Oct 14 02:27:54 EDT 2010 | patejl
Hello Pvasquez Well that is not a good news but it is what I thought. Lets see what will say our headquarters.Could you send me some more information or materials obout mirtec machines so I can present it to our company. Thanks
Electronics Forum | Tue Nov 02 15:51:10 EDT 2010 | pvasquez
Hello Patejl, Sorry, haven't been to the forum recently. Check out mirtec's website. There is some really detailed information there: http://www.mirtecusa.com. Chat with you soon.
Electronics Forum | Fri Oct 01 17:59:13 EDT 2010 | rway
Your real problem is further upstream. The limitations of your AOI aside, first find out why your leads are being lifted. Is it through handling or are they from the reel that way? To address your AOI question, Hegemon is correct, coplanarity inspe
Electronics Forum | Sat Oct 02 06:26:51 EDT 2010 | patejl
Thanks for your feedback, both of you. But my problem is that we have high mix and low volume its obout 50-200 pieces. And we also have manual paste priter so the solder on the pad look always diferent. I believe that there is the problem but I cano
Electronics Forum | Thu Nov 04 19:55:49 EDT 2010 | eadthem
The best method i have for the few lifted/bent lead issues we have is i use a ic/bridge inspector with all its default options to check for bridges and solder at the tip. then i add a solder inspector but this time accrost all pins at the downslope o
Electronics Forum | Tue Aug 31 21:45:49 EDT 2004 | KEN
I have experienced this directly in SMT and wave solder. Fillet lift (can) be a direct indicator to lead enrichment (but its not the exclusive symptom). Lead enrichment in smt joints reduces the interfacial strength shortening the time to creep f
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