> I think the best approach is like the commercial units. Have the drill
> under the table. Mine is above the table, but will convert it sometime
> down the track. The advantage of having the drill come up from the
> bottom is you have a flat table top to work on, with no drill motor in
> the way. Of course this means you now must have a means to view the hole
> location from above.
I think that has the big disadvantage of the drill lifting the PCB,
requiring a hold down foot or firm pressure by hand. I do not see big
disadvantages of the upside-down version.
>
> A method once talked about on this group was to use a cheapy CCD camera
> module and a TV with a composite video input as the viewing device.
> Cross hairs are drawn on the CRT screen.
> If you can get hold of cheap TV and CCD camera than I'd think this is
> the best way to go.
I know, and i even put aside a old camera for that. But it doesn't focus
up close and combining it
with lens seems just as complicated as simply using a screen instead of
the cam.
> ..
I had the plastic piping idea too. ideally it would have some thread to
adjust, or screws on the side.
ST