Rose Sphere 360-80 by Bob Keller

Rose Sphere 360-80 - designed by Bob Keller ©1999
360 facets 80 index
L/W = 1.000 H/W = 1.000 Vol./W^3 = 0.504

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
1 83.24 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
2 78.90 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, 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)

Rose Sphere 360-80 Cutting Notes

This meetpoint design for a rose cut sphere yields a "true" sphere. All of the vertices are equidistant from its center. Begin by cutting a 20-sided cylindrical preform. The height of the preformed cylinder must be equal to or greater than its maximum width for you to have enough material when you get to the course 9 (pole) facets. When you cut the course 1 facets for the first hemisphere, create a level 'girdle' (equator) line at half the height of cylinder.

Transfer when you've finished the first hemisphere, and repeat the course 1-9 sequence on the second hemisphere.

If you cut a Rose Sphere 360-80 of your own, be sure and let me know what you've cut and how you made out.


Index of Gem Designs

Perfect Transfer Index

Table of Contents


© Bob's Rock Shop Bob Keller