>> would break more bits with a press
>>
>> I've a couple each of hand drill steel bits 1.2mm, 1.5mm,
>> 2mm, and 3mm for fat legs and bolt holes etc
>
> That's interesting. How do you keep your hand so steady
> to hit the middle of the holes? How do you keep the angle
> at a perfect 90 degrees?

That should not be a problem for the future neurosurgeon :-)

Seriously, key points are:
- precision of rotation;
- speed of rotation;
- stiffness of the system (bits should be short);
- movable should be the lightest part of the system, that is PCB;

Fix the precision high speed motor. Mount the drill bits socket (<1mm)
on the motor's shaft. And use some llinear drive mechanism (from dot
matrix or ink jet printer, or scanner) to help your hands move the
PCB.
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