Homebrew PCBs

On 12/25/12, Harvey White <madyn@...> wrote:
>
>>Now that makes me wonder, as there are recommend speed rates for cutting
>>materials.
>>
>>What are the correct rpms for through drilling "virgin" boards and
>>different dia holes?
>
> Generally, from about #50 on down, I use at least 20000 RPM, and would
> use 30 from #60 on down, if I had something that did it.

Not uncommon for the drilling machines in the fabs to run at
200,000RPM.  They are insane to watch.  The drill heads pop up and
down as fast as the needle on a sewing machine.  I took some video at
the recent Shenzhen China PCB show, but because Youtube is blocked in
China, it's difficult for me to show you.

Mitch.