| GemCad Ray Traces for RI = 1.76 | ||
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| Random Model | Cosine Model | ISO Model |
| Defibrillator III
Designed by Bob Keller December 2001 |
|
| A CAM Style Heart for 120 gears suitable for Spinel, Garnet, Corundum... | |
| Angles for R.I. = 1.76 | 55 facets + 19 facets on girdle = 74 |
| 1-fold mirror-image symmetry | 120 index |
| L/W = 1.012 T/W = 0.585 T/L = 0.578 P/W = 0.411 C/W = 0.145 | H/W = (P+C)/W+0.02 = 0.576 P/H = 0.713 C/H = 0.252 |
| Vol./W^3 = 0.182 | Brightness at 0° tilt for RI = 1.76 COS = 72.3 ISO = 90.6 |
| Pavilion | |||
|---|---|---|---|
| cp | 36.00 | 15-45-75-105 | Cut to equal depth to establish center point |
| 1 | 42.62 | 011-109 | Cut facets 1-10 to centerpoint |
| 2 | 43.60 | 013-107 | |
| 3 | 43.91 | 015-105 | |
| 4 | 43.58 | 019-101 | |
| 5 | 42.86 | 021-099 | |
| 6 | 39.59 | 029-091 | |
| 7 | 37.69 | 037-083 | |
| 8 | 37.00 | 045-075 | |
| 9 | 40.21 | 057-063 | |
| 10 | 41.27 | 060 | |
| g1 | 90.00 | 011-109 | Set size, establish lower girdle line |
| g2 | 90.00 | 013-107 | Meet g1.1.2 |
| g3 | 90.00 | 015-105 | Meet g2.2.3 |
| g4 | 90.00 | 019-101 | Meet g3.3.4 |
| g5 | 90.00 | 021-099 | Meet g4.4.5 |
| g6 | 90.00 | 029-091 | Meet g5.5.6 |
| g7 | 90.00 | 037-083 | Meet g6.6.7 |
| g8 | 90.00 | 045-075 | Meet g7.7.8 |
| g9 | 90.00 | 057-063 | Meet g8.8.9 |
| g10 | 90.00 | 060 | Meet g9.9.10 |
| Crown | |||
| a | 37.26 | 011-109 | Match g1, establish upper girdle line |
| b | 38.73 | 013-107 | Meet a.g1.g2 |
| c | 39.01 | 015-105 | Meet b.g2.g3 |
| d | 38.89 | 019-101 | Meet c.g3.g4 |
| e | 38.09 | 021-099 | Meet d.g4.g5 |
| f | 35.13 | 029-091 | Meet e.g5.g6 |
| g | 33.13 | 037-083 | Meet f.g6.g7 |
| h | 32.50 | 045-075 | Meet g.g7.g8 |
| i | 34.80 | 057-063 | Meet h.g8.g9 |
| j | 37.76 | 060 | Meet i.g9.g10 |
| k | 36.97 | 012-108 | Meet g1.a.b.g2 |
| l | 36.34 | 017-103 | Meet g3.c.d.g4 |
| m | 31.66 | 025-095 | Meet g5.e.f.g6 |
| n | 28.32 | 041-079 | Meet g7.g.h.g8 |
| o | 30.75 | 014-106 | Meet k.b.c.l |
| p | 28.14 | 023-097 | Meet l.d.e.m |
| q | 22.04 | 038-082 | Meet m.f.g.n |
| r | 28.15 | 055-065 | Meet n.h.i |
| y | 0.00 | Table | Meet k.a.a.k, o.l.p, p.m.q, others |
The Defibrillator III Design File is available for GemCad users.
I designed Defibrillator III for a for a deep red pyrope garnet. This design is pretty bright as hearts go and is a good match for medium to deep saturated materials with RIs in the spinel-garnet-corundum range.
Begin the pavilion by carefully cutting four facets on indexes 15-45-75-105 at 36.00° to equal depth to establish a centered culet point. These four center point "finder" facets get cut away as pavilion facets 1-10 are subsequently cut to meet at this center point. The simple faceting in the "head" area on Defibrillator III should be facilitating if you are into vee notching your hearts.
