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December 2013

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Subject:
From:
Reuven Rokah <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Reuven Rokah <[log in to unmask]>
Date:
Mon, 2 Dec 2013 18:44:03 +0200
Content-Type:
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text/plain (217 lines)
Yes it may change because they have different elasticity.


On Mon, Dec 2, 2013 at 6:13 PM, Zilber Gil <[log in to unmask]> wrote:

> Thank you for you response.
> If the drill size is larger then the copper is thicker in order to
> maintain finish hole size. Does the softener copper (then the epoxy),
> significantly impact the amount of force required to install the connector
> and creating the gas tight seal?
> And one more question, what about changing the FR4 to polyimide, does it
> change the picture (more brittle)?
>
> Thanks
>
> ________________________________
> From: [log in to unmask] [mailto:
> [log in to unmask]]
> Sent: Monday, December 02, 2013 4:57 PM
> To: Zilber Gil
> Subject: Re: [TN] Press Fit Connector Drill size/finish size
>
> Hi Gil,
>         With finishes like OSP, immersion Sn & ENIG, the drilled hole size
> has a significant impact on the amount of force required to install the
> connector and the creation of the gas tight seal between the connector and
> the plated through hole.  Most of the hole size recommendation data comes
> from testing done to determine that the press fit interconnect is reliable.
>  The typical testing involves the Telcordia specification or whatever it
> has changed into.  If either your drilled for finished hole size is larger
> than recommended, then you run the risk of not forming a gas tight seal
> between the pin and the hole.  If either you drilled or finished hole size
> is smaller than recommended then you run the risk of bending the pins
> before insertion is completed.
>
>         You can always perform the qualification testing yourself on the
> deviated material, but the testing tends to take a long time and be fairly
> expensive.
>
> Valquirio N. Carvalho
> Mechanical Engineer
> Teradyne, Inc.
> Phone: 978-370-3613
>
>
>
> Zilber Gil <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
>
> 12/02/2013 07:14 AM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to
> Zilber Gil        <[log in to unmask]>
>
>
>
>
> To
>         <[log in to unmask]>,
> cc
>
> Subject
>         Re: [TN] Press Fit Connector Drill size/finish size
>
>
>
>
>
>
>
> Thank Reuven,
>
> Assuming OSP finish then my question.
>
> Thanks,
>
> Gil
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Reuven Rokah
> Sent: Monday, December 02, 2013 1:23 PM
> To: [log in to unmask]
> Subject: Re: [TN] Press Fit Connector Drill size/finish size
>
> Hi Gil,
> If you have HASL finish, the final hole size does not reflect the required
> press fit hole size.
> I you have OSP for example, the final holes size of PCB is the same as the
> press fit requirements.
>
>
> On Mon, Dec 2, 2013 at 1:01 PM, Zilber Gil <[log in to unmask]> wrote:
>
> > Hi all,
> >
> > Press-fit manufacturer / spec /mil (i.e. mil-c-28859B) define the
> > requested drill diameter and final diameter (and minimum copper and
> > plating thickness). In may cases the PCBs manufacturer asked us to
> > drill bigger diameter holes in order to get the requested final finish
> > hole (manufacturer process standard). My question is why press-fit
> > manufacturer/std define drill hole diameter and not finish hole
> > diameter and minimum copper thickness? What could be wrong if
> > approving manufacturer request (bigger drill diameter, control final
> finish)?
> >
> > Thanks
> >
> > Gil Zilber
> > Elta system Ltd.
> >
> > The information contained in this communication is proprietary to
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> >
> > Thank you.
> >
> >
> > ______________________________________________________________________
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>
>
> --
>
> Best Regards,
>
> *Reuven Rokah*
>
> Mobile: 972-52-6012018
> Tel:        972-3-9360688
> Fax:          076-5100674
> <http://www.rokah-technologies.com/>[log in to unmask]
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>
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>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
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> Aerospace Industries Ltd. and/or third parties, may contain confidential or
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> Thank you.
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>
> The information contained in this communication is proprietary to Israel
> Aerospace Industries Ltd. and/or third parties, may contain confidential or
> privileged information, and is intended only for the use of the intended
> addresse thereof. If you are not the intended addressee, please be aware
> that any use, disclosure, distribution and/or copying of this communication
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> Thank you.
>
>
>
> ______________________________________________________________________
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-- 

Best Regards,

*Reuven Rokah*

Mobile: 972-52-6012018
Tel:        972-3-9360688
Fax:          076-5100674
 <http://www.rokah-technologies.com/>[log in to unmask]
[log in to unmask]
www.rokah-technologies.com


This e-mail message is intended for the recipient only and contains
information which is CONFIDENTIAL and which may be proprietary of Rokah
Technologies. If you have received this transmission in error, please
inform me by e-mail, phone or fax, and then please delete all of the
original files and all other copies exist.


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