Hi Cherie,
They're punching through existing tabs and score lines. The boards are no more than 60mm (2.362in) diameter and no thicker than 1.6mm (0.062in). We've asked our supplier engineers to send photographs of the CM's apparatus for clarification.
Thanks,
Gary
>________________________________
> From: "[log in to unmask]" <[log in to unmask]>
>To: [log in to unmask]; [log in to unmask]
>Sent: Tuesday, February 26, 2013 11:21 AM
>Subject: Re: [DC] Punching tools
>
>
>Hi Gary,
>
>If they're punching through an existing TAB, you will probably be ok.
However, from Dieter's quote out of the IPC-2222:
>"Rejections can occur when the edge defect is greater than 50% of the
clearance to edge spacing. Brittle material or heavier glass weights increase this risk."
>
>I find that statement very telling. Your clearances from the edge of
the board are not that great. You'll need to know the thickness
of the boards & the glass content of the material to determine your
clearance needs.
>
>Cherie
>
>In a message dated 2/26/2013 7:20:18 A.M. Pacific Standard Time,
[log in to unmask] writes:
>Our Asia Pacific CM is requesting permission to use punching tools to singulate boards from panels.
>>
>>My experience with punching tool sets is that their cost
outweighs the benefits, but this CM states they can make the tool sets at a
beneficial cost.
>>
>>Our initial reaction is that it's okay, as long as
components are not stressed by the punching action of the male die onto the
female die, and as long as the exterior board profile dimensions match the
Gerbers.
>>
>>Earlier today I posted about edge spacing, and was also
curious whether minimum edge spacing would matter in the world of punched-out
boards.
>>
>>We saw the CM's panel design, and it was a combination of mouse
bite and v-score that really didn't look essentially different from what we
see without punching tools.
>>
>>There doesn't seem to be any IPC guidance
regarding punching tool accuracy or designing panels for punch. Any
comments welcome.
>>
>>
>>TIA and Best Regards,
>>
>>Gary M. Koven,
C.I.D.
>>InVue Security Products
>>
>>Charlotte, NC, USA
>>Board Of
Directors, RTP
Chapter
>>
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