Homebrew PCBs

You might try a 5/8"OD diamond thin wall core drill; it may be close 
enough to 12"ID and I think the FR4 would clear any copper buildup, and 
likely wear well.
Just a thought...
Roger
On 5/10/2014 7:10 PM, Jean-Paul Louis louijp@... [Homebrew_PCBs] 
wrote:
> Peter,
>
> You\ufffdre going to wear your punch very fast as FR4 is loaded with glass which is very abrasive.
> Unless you can have a very high resistance punch which would cost hundreds of dollars.
>
> I used a punch press to cut boards in a previous job. The wear of the punches and dies were very costly.
> so we replaced the whole process by a router. But that was for 0.062\ufffd FR4. You have also to make sure that
> there is no copper in the cut area.
>
> Jean-Paul
> AC9GH
>
>
> On May 10, 2014, at 8:31 PM, Peter Johansson rockets4kids@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:
>
>> I have a project idea that would require hundreds (possibly thousands)
>> of very small PCBs, each one being a circle approx. 1/2 inch in
>> diameter. Does anyone know if it would be possible to punch them out
>> of thin FR4 with a punch press? That is, use the material that is
>> normally discarded when punching out a hole.
>>
>> Aside from that, what (if any) are the issues with using thin (0.010"
>> - 0.030") PCB material in general?
>>
>> -p.
>>
>>
>
>
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