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Date: Wed, 04 Jun 1997 08:43:50 +0900
From: Motoyo Wajima <[log in to unmask]>
To: [log in to unmask]
Subject: Re: fab: drilling
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Motoyo Wajima <[log in to unmask]> さんのメッセージを転送します：
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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***************************************************************************
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***************************************************************************
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