If you have a motorized XY table (such as a CNC sherline mill), you could
mount the camera with some cross hairs and have a drill button that will
offset correctly automatically and drill.
Alternatively you could use a manual XY table with a digital readout and
again offset the known distance. You could even do it manually. Your work
flow would be see hole in crosshairs, move known XY offset, drill, move back
known XY, repeat.
Henry
On Thu, Jun 9, 2011 at 3:09 PM, Lawrence Kincheloe <lokimail@...>wrote:
>
>
> If I understand the problem correctly...
>
> An easier solution might be to map out the distortion using something like
> grid paper and use a clear stencil for "cross-hair" like grid lines.
>
>
> On Thu, Jun 9, 2011 at 4:30 PM, Leon Heller <leon355@...>
> wrote:
>
> >
> >
> > On 09/06/2011 20:51, Boman33 wrote:
> > > A very long time ago commercial hand drilling was done with the drill
> > > mounted under a table and a microscope with cross hairs was used on the
> > top.
> > > The drill was on an air cylinder so when things were lined up a
> > footswitch
> > > was pushed. No parallax. A similar rig was also used to create a NC
> paper
> > > tape so additional boards could be drill automatically.
> >
> > They had one of those at a French university where a friend of mine
> > works. I tried it out when I was working there, and it works very well.
> > They got rid of it when they closed down their in-house PCB fabrication
> > facility. It was made by Excellon, who invented the drill file format
> > that we still use. Someone in the UK actually offered me one of those
> > machines three or four years ago, but I wouldn't be able to get it up
> > the stairs here.
> >
> > Leon
> > --
> > Leon Heller
> > G1HSM
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
>
>
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