Cutting standard V3.0 main board down to metric size

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Cutting standard V3.0 main board down to metric size

Postby retired » Fri Apr 21, 2017 5:52 am

As per the title really.

The standard USA sourced board and case is 4" wide.

Unfortunately the rest of the world uses metric, and has done for a few decades, which means 100mm is what we buy over here which is slightly narrower (by 1.6mm) than a 4" board (and one hell of a lot cheaper than trying to import a USA 4" case and/or paying the extra for custom PCBs that are 101.6 wide, all the PCB fabrication places I use do metric only).

Because all my add-on boards are, inevitably 100mm, to stay "legal" I have to use a genuine V3.0 board in my case.

So, can i just mill 1.6 mm off the side(s) ?

There is nothing obvious on the outer layers that would suggest this would be a problem but I haven't a clue what the two inner layers are - presumably power and ground layers - but how far does the copper extend to the edges of the PCB ?

Would I be best taking 1.6mm off one side, 0.8mm off both sides, but would either expose the inner planes/traces and short out ground and/or power to the slots in the case ???

Rod.
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Re: Cutting standard V3.0 main board down to metric size

Postby jsmcortina » Fri Apr 21, 2017 5:57 am

retired wrote:the rest of the world uses metric, and has done for a few decades,

Since the mid 1960s I think.

I'll email Bruce Bowling with your question.

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Re: Cutting standard V3.0 main board down to metric size

Postby Bruce Bowling » Fri Apr 21, 2017 6:57 am

When I designed the board it targeted a specific case (4 inches).

You can take off board material along the top of the board (heatsink area) without any issue.

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