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April 2018

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Subject:
From:
Yuan-chia Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Yuan-chia Joyce Koo <[log in to unmask]>
Date:
Tue, 17 Apr 2018 09:54:46 -0400
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text/plain
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text/plain (90 lines)
totally agree.
On Apr 17, 2018, at 9:38 AM, Stadem, Richard D wrote:

> Consider also the required magnification. While Joyce's suggestion  
> is a good one for the purpose of screening false calls, the  
> magnification for different features on a given circuit board must  
> fall within IPC-A-610 and/or J-STD-001 requirements. This is  
> typically 20x for solder joints, less for most other applications  
> such as checking polarity, epoxy staking/bonding, etc. (naked eye,  
> 4-10X for referee purposes). If a final call on an AOI defect is  
> going to be determined by the referee tool, it better have the  
> correct magnification capability for what is being inspected.  
> Things like particulate matter, etc, are also naked eye, 4-10x  
> referee, and so on and so forth. If the inspector/operator is not  
> trained to use the correct magnification for what he/she is looking  
> at, you will have all kinds of issues and non-value-added rework  
> and touchup costs packed into your process. Not only you need to  
> keep the inspection tool well calibrated, you also need to keep the  
> Inspector's eyeballs well calibrated as well! They all have to be  
> on the same page.
>
> -----Original Message-----
> From: Stadem, Richard D
> Sent: Tuesday, April 17, 2018 8:27 AM
> To: [log in to unmask]; 'Riccardo Inverardi'
> Subject: RE: [TN] Handy Magnifiers anyone?
>
> You may wish to check the Mantis for ESD. The one I had experience  
> with was a huge ESD generator (tribo-charged to greater than 10,000  
> volts using a calibrated field meter). No matter what you select,  
> just be sure it is ESD-safe. Every single board is going to go by  
> under your inspection tool. Not having an ESD-safe tool is not very  
> smart.
> You would think the manufacturers of inspection systems that are  
> targeted for electronics use would make sure they are ESD-safe.  
> Guess what? Most are not!
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Riccardo Inverardi
> Sent: Tuesday, April 17, 2018 4:25 AM
> To: [log in to unmask]
> Subject: [TN] Handy Magnifiers anyone?
>
> Greetings to all TechNetters, I am facing a problem and I hope that  
> the great experience of the forum can help me.
>
>
>
> I have to provide our AOI operators with an adequate magnification  
> and illumination aid to inspect those features that a 2D AOI cannot  
> reliably inspect and/or to discriminate false calls from real defects.
>
> We have evaluated different magnification aids: from digital  
> magnifiers, to binocular microscopes. The absolutely best option is  
> a stereo microscope such as Vision Engineering's Mantis line: depth  
> perception is maintained and once the focus has been set, it's easy  
> to switch from focusing on the PC screen and inspecting the board.
>
> Disadvantages are high cost, but the worst is that they are  
> cumbersome.
>
> On the other hand, tabletop magnifiers are cheap, have good  
> illumination and they are really handy. It's a pity that they  
> usually are too cheap and most of all, it seems that no one makes  
> them with adequate magnifying power.
>
>
>
> Currently, our operators have to work ideally in a 1.5 square  
> meters' area (actually, they are not trapped in: it's just a  
> "designated area").
>
>
>
> Any suggestion, past experience and lessons learned that you can  
> share will be highly appreciated.
>
>
>
> Have a nice day,
>
> Riccardo Inverardi
> AOI Programmer | IPC/J-STD-001 + IPC-A-610 Certified IPC Trainer
>
>
>  <http://www.inteaengineering.it/> INTEA ENGINEERING via Chiusure  
> 20 Sale Marasino (BS) T +39 030 9824406 | F +39 030 9824407
>
>

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