Re: gEDA-user: [pcb] drill helper

[Tomaz Solc <tomaz.solc@tablix.org>]

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Hi

> Good idea, what would be the "much smaller drill hole"? If it's too small,
> it can disappear with toner transfer, if it's too big it doesn't center
> the drill. I would suggest ~0.4 mm.

I suggest using a formula like this:

When using the drill helper, make drills holes 1/3 or 1/4 of their size,
but no smaller than 30mil.

I can easily drill 30mil holes without any special helpers and 30mil is
large enough for any etching technique. On the other hand I do have
problems centering drills for larger mounting holes. A 30mil hole in the
copper is too small to have any mechanical effect on a large drill bit,
so it would need to be proportionally larger for larger holes.

Best regards
Tomaz
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