This 'lil project of yours raised an eyebrow over here, so I decided to ask 
my favorite prototype house if they could do this... and they said "sure"
So, you might want to give these guys a call.
I've had really good luck with them both on quality and prices, and I don't 
usually go around plugging boardshops.  Disclaimer:  I have never asked 
them to do anything like this :)

Prototron Southwest

Good luck,


At 10:34 AM 12/21/2001 -0500, you wrote:
>mr. lomax:
>thank you for your comments.  if a single board is unobtainable
>or way too pricey, i will do like you say and sandwich two 63mil
>boards onto a core.  i've posted another email on why i'd like
>to avoid this.
>is the 1-to-3 relationship between via width and via depth the
>same for a thruhole pad?
>thanks, miker
>-----Original Message-----
>From: Abd ul-Rahman Lomax [mailto:[EMAIL PROTECTED]]
>Sent: Thursday, December 20, 2001 5:58 PM
>To: Protel EDA Forum
>Subject: Re: [PEDA] special board requirements ??
>At 09:03 AM 12/20/01 -0500, Robison Michael R CNIN wrote:
> >i need a 330mil thick board with 70mil taken off of mirrored sections on
> >both sides.  i'm thinking a 100mil radius tolerance on the inside of the
> >milled corners, and probably +/- 5 or 10 mil on the milled edges.  the
> >size of the board is 12"x7".
>That's not a printed circuit board, that is a brick.
>Because you are far outside standard board production, it may be much more
>cost-effective to make two boards and sandwich them around some board or
>other material in the middle. Vias can be skewers (I've seen this done for
>space-flight boards). If you really want to plate holes through 330 mil of
>board thickness, know that the rule of thumb is that hole plating starts to
>get dicey at about one-third the board thickness. i.e., over 100 mils in
>your case, though the rule of thumb might not apply with such large holes.
>The sandwich approach, if the outer boards are standard 062 material, will
>give you close to the 70 mil section removal. This, too, should save on
>To do the whole thing in PCB material, the inner boards could be, say .125
>board material or other standard size or sizes to make up what you need; to
>save money, I'd have the inner boards have no copper at all, they would
>just be routed board blanks, drilled where necessary for skewers, and I
>would glue the stack together. If the inner boards have copper pads,
>however, skewer wires, when soldered, could hold the stack together.
>Abdulrahman Lomax
>Easthampton, Massachusetts USA

Frank Gilley
Dell-Star Technologies
(918) 838-1973 Phone
(918) 838-8814 Fax

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