Gary,
You are right round boards are the most challenging to palletize, I've done a few of them and we sometimes end up having to rework the edges. There probably isn't a perfect solution, just the one that fits you best.
That's what I love about being a designer, the variety of challenges we face keeps it interesting. As you said... good fun.
Arlene
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Gary Koven
Sent: Wednesday, February 13, 2013 8:54 PM
To: [log in to unmask]
Subject: Re: [DC] Board panelization techniques
As I remarked to Arlene Fox's email in regard to your comment about the note, my team had concerns with the note as well. We don't really want to allow intrusion into the board outline. We'll probably end up having the ME's designate critical edges when they send us the shape, then we'll specify no breakout along those edges, on the drill drawing, on a board by board basis, and then we won't need the note.
If the CM pushes back, we can always request a panel approval artwork as you suggested. So far it hasn't yet come to that. But we make a lot of round and semi-round boards, which are the most wasteful shape in terms of cost efficacy, and the most difficult to panelize properly. Good fun.
Thanks,
Gary
>________________________________
> From: Greg Smith <[log in to unmask]>
>To: [log in to unmask]
>Sent: Tuesday, February 12, 2013 6:10 PM
>Subject: Re: [DC] Board panelization techniques
>
>Hello
>
>I'm going to have to respectfully disagree with the need for a panel drawing.
>
>It depends...
>
>I have worked for companies that bought their bare boards from outside fab shops and did the PCB assembly in house.
>We always did a panel drawing as we knew exactly what our tooling, equipment, and design needs were.
>
>I have worked on designs where the PCBA was an assembled panel that did not get broken up until final assembly in the end product. That required a panel drawing.
>
>Other times the company worked with a specific fab house and a separate specific assembly house. We did not supply a panel drawing but asked the fab shop to supply a Gerber or pdf of their proposed panel for our approval and, more importantly, the assembly shops approval. This allowed both shops to negotiate the design that best met their capabilities.
>
>I have also worked on designs where I would not even know what continent the fab and assembly shops were located in. The contracted manufacturers had locations world wide and would use the appropriate facilities that had time available to meet the order. This means the panel size could be different for every order placed as the location could change. That means the panel could, for instance, be prototyped in a shop using inch dimensions, and mass produced in a shop using metric dimensions. A panel drawing would then tie the shops to a possibly wasteful or inefficient design.
>
>However, if there are specific design needs that require that break-away tabs or scoring areas not be located in certain places, then this needs to be on the fab drawing. You just don't need a panel drawing to do this.
>
>Greg Smith
>
>
>
>On 2/12/2013 1:21 PM, Pete wrote:
>> If you don't wish to make panelization drawings as a time savings, you'll spend more time fixing issues. Always make a panel drawing, the fab house doesn't know the board assembly, the CM doesn't know the end product. You know what you need, put it on a drawing so there's no doubt.
>>
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