Em 6/8/2010 08:24, Michael Rigby-Jones escreveu:
> You need what is called a "clearance" hole, which for M3 is 3.2mm. =20
>
> In practice a 3mm hole will likely work since a 3mm drill bit guided by
> hand will most always cut slightly larger than 3mm, but you need to
> consider the tolerance stack up of the holes in all the parts you are
> screwing together.

Unless you clamp all the parts together and drill them all at once.

A bench drill helps a lot, to keep all the hole's axis perfectly parallel.
The thinner the parts you are drilling, the more you can drill clamped
together.

Isaac

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