Stefan,
what I was using were pads without copper, but maybe
this is not the best way if I'm going to send this
design to a PCB manufacturer. Also, I found out that
clearance holes must be at least a 5% larger than the
screw diameter. A rule of thumb is to use clearance
holes 10% larger than screw diameter.
Regards
Jose
--- Stefan Trethan <
stefan_trethan@...> escribió:
> On Wed, 08 Feb 2006 17:42:18 +0100, Jose Fuentes
> <josecarlosfuentes@...> wrote:
>
> > I am designing a board that will have two holes
> for
> >
> > screws. How can I place those holes in the PCB
> >
> > without using pads?
> >
> >
> > Regards
> >
> >
> > Jose
>
>
> I fear that depends on your software.
>
> Mine has a feature for placing holes, but it is
> basically only a pad
> (usually) without electrical signal.
> You can set copper diameter and drill diameter
> individually, if drill
> diameter is the same or larger there will be no
> copper ring around the
> hole.
> It should be possible to use a normal pad if your
> software doesn't allow
> for special holes.
>
> As for producing the PCB, i will usually print with
> option "centering
> holes only" which reduces the size of all holes to
> what is useful in
> centering the drill. Then i'll drill there with some
> small drill i use for
> other pads, and at the end enlarge the hole with the
> right size drill. I
> want a hand puch for punching them holes for ages,
> but they don't seem to
> find their way over the atlantic.
>
>
> ST
>
>
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