In the course of making a hammered dulcimer, I needed to drill some holes
at 38 degrees for braces between the two pin blocks. After much
muttering and adjusting, I got the table to lock down at that setting.
But when I drilled the holes, I found that tilting the table to 38
degrees in one axis also tilted it 2-3 degrees in the other axis. That
means the braces won't fit from one pin block to the other.
Now I'm trying to figure out what happened. OK, it could just be a
faulty drill press and I'm SOL. But I'm wondering what if the table was
not exactly centered under the head. Since both swing independently,
it's possible for that to happen. And I had to swing both 90% to avoid
hitting the base (it's a benchtop drill press, albeit an old heavy one).
But my geometry visualization skills aren't of the best. If the head and
table weren't on the same exact vertical (Z) axis, would a change in the
parallel to the shaft (X) axis result in a change in the perpendicular to
the shaft (Y) axis?
I've filled the holes and am waiting for the glue to dry. If the
centering is the problem, I'll get everything lined up and try again. If
not, I'll find another way to install braces - I've already figured out
one or two alternatives.
While I'm on the subject of drill presses, does *anyone*
make one that
doesn't require loosening a bolt to tilt the table? I've looked at
Delta, Jet, Powermatic, Shop Fox, etc. and they all use a bolt and a pin
to force 0 degree alignment.
I'm seriously thinking of getting a radial arm drill press when I can
afford one, but I've heard that they aren't too accurate because of too
much flex. Is this still true? Or mayde still true for some and not
Intelligence is an experiment that failed - G. B. Shaw