Ours goes down to US0201 (world 0603), and I'm starting to review systems for US01005(world 0402). Don't know who decided to call those parts 01005 in US, maybe to make fun of our inability to convert to a sensible unit system!
Wayne
-----Original Message-----
From: Inge [mailto:[log in to unmask]]
Sent: Thursday, May 20, 2010 12:27 PM
To: Thayer, Wayne - IIW; [log in to unmask]
Subject: Re: [TN] Component legend marking on PWB with 0402 components
I might been a little unclear, in fact I took the opportunity to ask about
minimum size for the P-P system.
Inge
--------------------------------------------------
From: "Thayer, Wayne - IIW" <[log in to unmask]>
Sent: den 20 May 2010 17:59
To: <[log in to unmask]>
Subject: Re: [TN] Component legend marking on PWB with 0402 components
> Hi Inge!
>
> Not sure what you mean by the camera in this thread. I've always thought
> legend ink was just for hand assembly or manual inspection.
>
> Wayne
>
> -----Original Message-----
> From: Inge [mailto:[log in to unmask]]
> Sent: Thursday, May 20, 2010 9:17 AM
> To: Thayer, Wayne - IIW; [log in to unmask]
> Subject: Re: [TN] Component legend marking on PWB with 0402 components
>
> What's the minimum size of components to be correctly recognised by the
> camera system ?
>
> Inge
>
> --------------------------------------------------
> From: "Thayer, Wayne - IIW" <[log in to unmask]>
> Sent: den 20 May 2010 14:45
> To: <[log in to unmask]>
> Subject: Re: [TN] Component legend marking on PWB with 0402 components
>
>> You can check with other vendors. Generally we don't bother with silks
>> for our designs if the parts are small--they can just get in the way.
>> But
>> some vendors offer (for a bit more money) photo-defined legend, which is
>> basically a very highly pigmented LPI soldermask product. Not only can
>> you image 0402 outlines, you can make legible (for those under 40)
>> reference designators for them!
>>
>> Wayne Thayer
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
>> Sent: Wednesday, May 19, 2010 6:59 PM
>> To: [log in to unmask]
>> Subject: Re: [TN] Component legend marking on PWB with 0402 components
>>
>> Hi,
>>
>> Yes, I have the same issues. Marking for 0402 and smaller is "Very
>> Difficult". Having looked at a lot of boards for assembly I also find
>> 0402
>> marks result in "Less Than Dense" packing. Folks that use and mark 0402
>> could usually have used 0603.
>>
>> Here is an interesting side note:
>>
>> If you look at what these new silk screen printers can do from a
>> marking standpoint they are amazing. The problem is the interface media
>> to
>> the fab house is typically gerber format and in house design rules trash
>> thin lines or lines close to pads. There almost needs to be a complete
>> re-think about silk screen rules as these new printers are a light year
>> ahead of old silk screen technology.
>>
>> Bob Kondner
>>
>>
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Temkin, Gregg
>> Sent: Wednesday, May 19, 2010 6:49 PM
>> To: [log in to unmask]
>> Subject: [TN] Component legend marking on PWB with 0402 components
>>
>> On a first shipment from a new PWB supplier, we found all the 0402
>> component
>> outlines deleted from our legend layers. The PWB vendor said they
>> automatically deleted the marking during DFM because it exceeded their
>> manufacturing allowances and could have resulted in ink covering a
>> portion
>> of the pad.
>>
>> Our in house PWB designer uses a program to develop his pad and marking
>> dimensions. The program would not generate a marking outline for this
>> device, so he designed the outline to be the courtyard plus some
>> manufacturing allowance.
>>
>> Other vendors have supplied with PWBs with the same outline marking
>> configuration; seemingly without any problem.
>>
>> I've reviewed IPC-7351A, but couldn't find mention of PWB marking
>> recommendations. Is there guidance that I missed of is there another
>> document I should be looking at? Is it generally assumed that outline
>> marking of 0402 and smaller devices is impractical? Is placing a
>> remotely
>> located legend the best way of showing 0402 placement and orientation?
>>
>> Thanks for your help.
>>
>> Gregg
>>
>>
>>
>>
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