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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