Rose Egg 480a-80
| Rose Egg 480a-80 – designed by Bob Keller bob@rockhounds.com ©1999 | |
|---|---|
| 480 facets | 80 index |
| L/W = 1.000 H/W = 1.300 | Vol./W^3 = 0.662 |
| Hemisphere A | |||
|---|---|---|---|
| p | 90.00 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Cut to equal depth, set size |
| 1 | 83.24 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Cut level girdle (equator) line |
| 2 | 78.90 | 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 | Meet p,1 |
| 3 | 64.94 | 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 | Meet 1,2 |
| 4 | 61.40 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Meet 1,2,3 |
| 5 | 46.32 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Meet 3,4 |
| 6 | 44.08 | 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 | Meet 3,4,5 |
| 7 | 27.62 | 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 | Meet 5,6 |
| 8 | 26.69 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Meet 5,6,7 |
| 9 | 9.14 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Meet 7,8,apex (pole) |
| Hemisphere B | |||
| a | 88.73 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Meet 1,2 on hemisphere A |
| b | 84.28 | 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 | Meet 1,2 on hemisphere A, a |
| c | 81.51 | 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 | Meet a,b |
| d | 77.18 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Meet a,b,c |
| e | 73.67 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Meet c,d |
| f | 69.64 | 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 | Meet c,d,e |
| g | 64.79 | 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 | Meet e,f |
| h | 61.24 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Meet e,f,g |
| i | 54.33 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Meet g,h |
| j | 51.48 | 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 | Meet g,h,i |
| k | 41.68 | 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 | Meet i,j |
| l | 39.78 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Meet i,j,k |
| m | 26.47 | 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 | Meet k,l |
| n | 25.60 | 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 | Meet k,l,m |
| o | 9.08 | 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 | Meet m,n,apex (pole) |
Begin by cutting a 20-sided cylindrical preform. The height of the preformed cylinder must be equal to or greater than 1.3 times its maximum width for you to have enough material when you get to the course 9 and o (pole) facets. When you cut the course 1 facets for the A hemisphere, create a level ‘girdle’ (equator) line dividing the height of cylinder proportionately, allowing 1.6 times more for the z dimension of the B hemisphere as the A hemisphere.
Transfer when you’ve finished the A hemisphere, and cut the course a-o sequence on the B hemisphere.
If you cut a Rose Egg 480a-80 of your own, be sure and let me know what you’ve cut and how you made out.