Hey Thanks for your help.

Do you find that through hole diameter is important? The pad size is
1.2mm square and I am putting 0.75mm holes in them.  This would best be
directed to the people who will make these moduels for us but I am in
Australia. I am still looking for somebody here.

We think in Metric ;)

Rod.

On Wed, 2004-12-08 at 04:27, Brooks,Bill wrote:
> I have done this "half-a-hole" castellation on some .032 thick
> fiberglass/epoxy material, multilayer... with very small vias and a 0.8mm
> pitch BGA mounted to it...
>
> We built the 'chip carriers' into a panel... and the board house routed out
> the 1/2 a plated thru hole by drilling an extra hole tangent to the main
> hole and then routing them in half.
>
> There was some de-burring to do on some of them until they got the process
> down...
>
> There is a picture of the board on my website. Also check the FAQ area and
> look at the close-up view of the castellation holes. http://pcbwizards.com
>
> The shop that did the work for me is Hughes Circuits in San Marcos
> California. Talk with Jerry or his son Jeff Hughes and they can explain the
> process.
>
>
> Bill Brooks - KG6VVP
> PCB Design Engineer , C.I.D.+, C.I.I.
> Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
> e-mail:[log in to unmask]
> http://www.dtwc.com
> http://pcbwizards.com
>
>
> -----Original Message-----
> From: Roderick Taylor [mailto:[log in to unmask]]
> Sent: Tuesday, December 07, 2004 12:20 AM
> To: [log in to unmask]
> Subject: [TN] PTH cut in half to make SMT pads
>
> Hi,
>
> Some surface mount modules that I bought are made from regular PCB
> material and the mounting pads seem to be plated through holes cut in
> half.
>
> I can't buy those modules anymore and the manufacturers have made lots
> of our product but without these modules.  I need to make an adaptor pcb
> and doing it the way the orignal modules were made seems to be the
> easiest.
>
> They are just PTH cut in half with a nice cutting tool aren't they? Or
> are they a PCB with half of the PTH on the PCB and the other half
> falling off the side?
>
> If I went to our rapid prototyping people with this on our PCB would
> they understand?  Do you understand what I mean?
>
> Rod.
>
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