Thanks.? Linear rail platform, linear stepper, stopping points
are settable (in use).? Worked well until I started making PC
boards that were too complicated to produce here.
Harvey
On 11/8/2020 12:04 AM, Bertho wrote:
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Nice setup!
?
?
?
We're talking variations on a theme.?
Mine seems to be more elaborate, but then again, I could
throw stuff at it.
/g/homebrewpcbs/album?id=86511
Harvey
?
On 11/7/2020 11:19 PM, Mike wrote:
"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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