I did put a transparency over the screen, laser printed one.? I
have the plans for a video crosshair generator in the works, which
would be much better.? The camera is an old security camera which
runs off 12VDC or 24VAC.? The whole thing runs off 12VDC, so
that's why I got the camera that I did.? Hamfest stuff a while
back.?
I used the rototool (Proxxon) because it's got a higher RPM, much
better bearings, and a much better chuck than the dremel.? I did
have a dremel on a stand, but the parallax was horrible.? The
reason for making this as is?? I wanted a fixed setup that could
be left in one piece.? The stand was from an old (and no, I didn't
buy anything but the stand, all there was) Pace desoldering
system.? I bought a second one and made an adaptor for the
existing hot air desoldering system I have.? Then again, the
metcal tips work even better with less trauma to the chip.
You can argue that mine is a bit of overkill, but then again, why
not?
Harvey
On 11/9/2020 1:10 AM, Mike wrote:
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Yes, I see
from the photos that they are in principle much the same. A
spinning drill bit that can be raised and lowered, a place
slide the pcb around in any direction to reach each of the
holes to be drilled, and a camera on the opposite side to have
a consistent viewing angle. You are using a roto-tool to get
higher rpm for the drill bit, a single axes slide with a
stepper motor to advance and pull back the drill and a much
fancier camera than I have. Plus yours, as you have said, has
the drill upside down so that you see the board the same way
as the camera does. Do you have crosshairs taped to the
display screen? I needed them on mine because the axis of
rotation of the drill bit is not parallel to the vertical
axis.
Yours does
look very substantial. Mine can still be used as a regular
drill press between circuit boards without any disassembly and
reassembly. I wish I could post pictures of mine, but it is
still locked up in a shipping container along with the rest of
my workshop waiting for the new workshop to be finished. I
added my approach just to provide people with an alternative
so that they can choose which suits them best.
--
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