manufacturing video - AOI - QA - Page 1
Forum section: electronics / general

author: GiskardReventlov
author_rank: Frequent Contributor
timestamp: January 28, 2014, 07:28:23 pm
content: There is a board called the Beagle Bone Black that is very capable (has amazing specs actually), here is a nice video of some being made, best at higher res.http://youtu.be/FcqQvH41OR4The selective soldering is interesting. It's all interesting since I've not seen that before.If you watch see if you notice a glaring mistake. I played it back and it look likes a screw up. I'll post some more data that may or may not be relevant.How accurate are the Automatic Optical Inspection (AOI) in general? (this one's by mechatronix systems) It seems to me that they would very rarely miss something. But as unlikely as it would seem it's got to be possible.I'll post some more data later.

author: Shock
author_rank: Super Contributor
timestamp: January 29, 2014, 05:36:29 am
content: Tantalum capacitors look installed rather randomly?

author: GiskardReventlov
author_rank: Frequent Contributor
timestamp: January 29, 2014, 05:48:31 pm
content: Shock, not sure about that.Here's the punchline (maybe I misunderstood the video), in the QA section they pan the camera from right-to-left showing the monitors. The left-most monitor shows a problem. The testing device clearly shows a fault with the unit under test. But the technician presses 1 instead of 0 (for failed). Now the serendipitous part is that there was a problem reported recently with HDMI and the problem in the video was HDMI problem it seems.http://www.adafruit.com/forums/viewtopic.php?f=49&t=48935Amazing to me that the AOI missed something so obvious but maybe those with direct AOI experience can comment.

author: Shock
author_rank: Super Contributor
timestamp: February 01, 2014, 11:40:08 pm
content: It looks like the display on the left is an RGB test.The automated tests are only as good as the person who designed them.By the way it helps to include a time in the video and what your talking about upfront.

author: GiskardReventlov
author_rank: Frequent Contributor
timestamp: February 03, 2014, 10:43:06 pm
content: Quote from: Shock on February 01, 2014, 11:40:08 pmMay be an RGB test but the test harness had a red failure light illuminated.QuoteI recall that the QA was near the end. I didn't mention what I saw only because I was interested to know if it jumped out at anyone else.After replaying it seems they pressed Pass but should have failed it.

author: JoeyP
author_rank: Frequent Contributor
timestamp: February 03, 2014, 10:53:10 pm
content: In my experience with CM's who use it, AOI is borderline useless. It can be effective for finding missing components, but AOI equipment manufactures market it as being able to detect things like bad solder joints etc., and I just have not seen it ever reliably do that. I think it's useful more as a pre-inspection that may catch some defects, but is no real substitute for either human inspection or 100% functional test. If a CM offers it at an additional charge - pass. If they included it as part of their normal process it probably can't hurt.

author: GiskardReventlov
author_rank: Frequent Contributor
timestamp: February 04, 2014, 04:37:41 am
content: @JoeyPThat's interesting, while watching that video it seems like it would be trivial for the AOI to find a misplaced chip. Especially since there's a white border around it and the border is visually broken when the chip is misplaced.

author: M0pmz
author_rank: Newbie
timestamp: February 04, 2015, 04:32:04 pm
content: Video shows some neat live AOI here that they find valuable:I don't know this process (I'm no expert) but I did ask a man who owns this UK design/production outfit.His 2p is:- Very valid point above: AOI salesmen do oversell the solder quality inspection as "solved" - it does work well but often sees false positives you have to manage...- BUT AOI does do much more than human inspection when it comes to inspecting many boards:- and AOI highlight solder joint problems humans don't catch unless you're combing 10 specials..bottom line: clients get a greater certainty overall that final products are correctly builtGuess it's another viewpoint and depends how you're implementing (..whatever, I enjoyed BitBox Limited various YouTubes, on ARM Cortex design, test and production)