If I'm correct you would not like to make your shank half
round but D-shaped. In that case the correct formula would be: (3.14
times 0.5 times diameter) + diameter + stock thickness of shank (to
compensate for the bending). It cooks down to 2,57 times diameter +
Hmmm? I think we may need a clarification here.
I worked through Niels’ formula and realized that he’s envisioning a
true D-shape, where the upper shank forms a straight, horizontal base
for soldering the bezel to it. In which case, his formula is
If we’re talking a true half-round shank, with the bezel itself
(e.g., bezel cup) taking the place of the upper shank in Niels’
vision, the formula would be: (3.14 times 0.5 times diameter) + stock
thickness of shank – though I’m not sure whether a full thickness of
a shank would be needed.
But, in both the above, you’d end up with gaps between the finger and
the shank in the upper corners – not a problem if that’s part of
your design. As usual, I was thinking of something totally different
still – more of a C-shape. In which case, I think the easiest route
is making a full shank and filing/grinding/cutting/milling a flat for
the bezel to mount to.
So, which is it?