4.234 16 Rectangular Checkerboard BCA

  • Hamer| John;Personal communication;
  • L/W=1.2
  • H/W=0.817
  • Vol/W^3=0.45
  • 40+8 Facets
  • Gear: 96
  • Remarks: BCA=Below the Critical Angle
12 24 36 48 60 72 84 <96> W W L L C C P P a b c d a b g1 g2 g3 1 2 3 4 5 6 7 g2 1 2 3 4 7 a c a b c d a b g1 g2 g3 1 2 3 4 5 6 7 g2 1 2 3 4 7 a c PC 04.234 16 Rectangular Checkerboard.BCA. Designed by J Hamer May 2014. Copyright assigned to the public domain. Angles for R.I. = 1.540 40 facets + 8 girdles 2-fold, mirror-image symmetry; 96 index L/W = 1.200 P/W = 0.534 C/W = 0.270 Vol/W³ = 0.450 pc04234.asc
g190.00°24-72Establish width
g290.00°96-48Establish length
g390.00°12-36-60-84Cut by eye big enough for prong
137.50°12-36-60-84Establish girdle position. Cut to centerpoint.
237.50°15-33-63-81Meet 1, g1, g3
338.28°09-39-57-87Meet 1, g2, g3
443.41°05-43-53-91Meet 3, 1, g2 g3
542.06°19-29-67-77Meet 2, 1, g1, g3
645.81°24-72Meet 2, 5
748.94°96-48Meet 3, 4
a31.11°12-36-60-84Establish girdle
b24.60°19-29-67-77Cut to 1/4 width by eye
c24.25°05-43-53-91Cut to 1/4 length by eye
d12.12°12-36-60-84Meet c, a, b

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