A little late, but this is my solution to accurate pcb drilling
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Mark
At 11:19 PM 11/7/2020, you wrote:
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"The registration holes
need to be exact, which is why I made an upside down drill press, which
is far more accurate (no parallax)."
I used a different technique to get the same benefit. FRP boards in the
thickness we use are somewhat transparent, you can see the drill bit from
the other side right down to the point of contact, thus no parallax, same
as above. To use a normal, bench mount drill press, I purchased a
single-board camera with NTSC output that I then fed into a small TV set.
I built a small holder for the camera (about 1 inch cubed) plus a 45
degree angle mirror so that the debris from the drilling did not fall on
the camera and cover the lens. Looking up through the hole in the center
of the drill press table, I was able to position the board with one hand
and lower the drill with the other. Gravity works in the same direction
as drill force, so it was easy to position the board while it was resting
on the table and still provide firm support against the drilling. It
worked ell enough for a cheap, out-of-alignment harbor freight drill
press to make accurate holes. My approach does require the extra purchase
of a $40 or less mini board camera but eliminates the problem of keeping
the board from falling down when not drilling or of keep the board in
place against the force of drilling.
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