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From [log in to unmask] Tue Jun 3 08: |
54:20 1997 |
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>From bergdi Tue Jun 3 04: |
11:00 1997 |
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Motoyo Wajima <[log in to unmask]> さんは書きました:
>Hi Susan!
> It depends on the thickness of PWB and the drill diameter.
>
>No.of Stack Thickness of PWB Drill Diameter TotalAspectRatio
> (mils) (mils)
> 4 63(double sided) 24 10.5
> 3 31(multilayer) 12 7.8
> 2 63(multilayer) 16 7.9
> 2 39(multilayer) 12 6.5
> 1 63〜(multilayer) 12〜 5.3〜
>Drill bit bending increase in higher aspect ratio.
>Regards,
>Motoyo Wajima
>General Purpose Computer Division,Hitachi,Ltd.(JAPAN)
>
>[log in to unmask] さんは書きました:
>>One of my customers has a question regarding stack
>>height for multilayer printed boards for drilling.
>>
>>When I was building boards, I drilled only one at a time.
>>However, we were not producing high volumes of boards
>>and all I can think of is why I wouldn't want to do it.
>>
>>Do any of you have experience drilling more than one
>>panel of multilayers at a time? What are your criteria
>>for determining when to stack and how many?
>>
>>Thanks,
>>Susan Mansilla
>>Robisan Lab
>>
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>
>***********************************************
>Motoyo Wajima
>General Purpose Computer Division,Hitachi,Ltd.
>1 Horiyamashita
>Hadano-shi,Kanagawa-ken,259-13 Japan
>E-mail:[log in to unmask]
>Fax:+81-463-88-2935
>***********************************************
***********************************************
Motoyo Wajima
General Purpose Computer Division,Hitachi,Ltd.
1 Horiyamashita
Hadano-shi,Kanagawa-ken,259-13 Japan
E-mail:[log in to unmask]
Fax:+81-463-88-2935
***********************************************
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* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
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