Gerald

I guess all that any of us can do is experiment.

I remember many years ago Western Electric was limited (by us smart folks)
to no more than one panel per lamination opening. The press operator (not an
engineer) showed us that this was a ridiculous taboo.

This became a mind broadening event for many of us to say the least as the
cost savings was enormous.

Best regards

Lee

I. Lee Parker, Ph.DO.
JPL Consultants LLC
804 779 3389


----- Original Message -----
From: "Gerald Gagnon" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, March 18, 2006 10:57 AM
Subject: Re: [TN] Die Punching PWBs as opposed to drilling and NC routing


> Joe,
>
> Thanks.
>
> I hope there will be more comments particularly from producers and users
> of
> punched PWBs. Coming from the mainstream, punching seems to be a lost art.
>
> I am concerned about punching multilayers particularly with the newer
> materials that we use today which might not have been evaluated or
> formulated for punching.
>
> Thanks,
>
> Gerry
>
>
> From: Joe Fjelstad <[log in to unmask]>
> Reply-To: TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
> To: [log in to unmask]
> Subject: Re: [TN] Die Punching PWBs as opposed to drilling and NC routing
> Date: Fri, 17 Mar 2006 16:00:16 EST
>
> NC drills are highly versatile and stacking panels provides some economy
> and
> so it will be hard to displace them.
>
> Punching can be fast (all holes at once) but is one at a time and
> depending
> on approach, hole count and feature size the tooling might be costly and
> must
> be amortized over a number of panels to pay for the tool.
>
> Hole quality is not as good making plating more of a challenge if you plan
> on doing double sided PCBs. I have not heard of MLBs being punched
> (except
> when the drills got too dull ;-)
>
> There should also be some concerned about punching small holes on fine
> pitch
> in glass fabric as there would be a higher risk of CAF, however  for
> polymer
> films it is not so much of an issue.
>
> I expect there will be other comments coming.
>
> Joe
>
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