Rose Sphere 840-80 by Bob Keller

Rose Sphere 840-80 - designed by Bob Keller ©1999
840 facets 80 index
L/W = 1.000 H/W = 1.000 Vol./W^3 = 0.514

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 87.97 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 84.39 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31-33-35-37-39-
41-43-45-47-49-51-53-55-57-59-61-63-65-67-69-71-73-75-77-79
Meet p,1
3 73.17 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31-33-35-37-39-
41-43-45-47-49-51-53-55-57-59-61-63-65-67-69-71-73-75-77-79
Meet 1,2
4 70.00 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 Meet 2,3
5 64.89 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 Meet 3,4
6 61.95 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31-33-35-37-39-
41-43-45-47-49-51-53-55-57-59-61-63-65-67-69-71-73-75-77-79
Meet 3,4,5
7 50.71 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31-33-35-37-39-
41-43-45-47-49-51-53-55-57-59-61-63-65-67-69-71-73-75-77-79
Meet 5,6
8 48.71 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 Meet 6,7
9 41.04 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 Meet 7,8
10 39.46 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31-33-35-37-39-
41-43-45-47-49-51-53-55-57-59-61-63-65-67-69-71-73-75-77-79
Meet 7,8,9
11 28.20 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31-33-35-37-39-
41-43-45-47-49-51-53-55-57-59-61-63-65-67-69-71-73-75-77-79
Meet 9,10
12 27.49 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 Meet 10,11
13 17.28 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 Meet 11,12
14 16.67 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 Meet 11,12,13
15 5.71 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 Meet 13,14,apex (pole)
Hemisphere B
1 87.97 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 84.39 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31-33-35-37-39-
41-43-45-47-49-51-53-55-57-59-61-63-65-67-69-71-73-75-77-79
Meet 1 and 1,2 on hemisphere A
3 73.17 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31-33-35-37-39-
41-43-45-47-49-51-53-55-57-59-61-63-65-67-69-71-73-75-77-79
Meet 1,2
4 70.00 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 Meet 2,3
5 64.89 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 Meet 3,4
6 61.95 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31-33-35-37-39-
41-43-45-47-49-51-53-55-57-59-61-63-65-67-69-71-73-75-77-79
Meet 3,4,5
7 50.71 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31-33-35-37-39-
41-43-45-47-49-51-53-55-57-59-61-63-65-67-69-71-73-75-77-79
Meet 5,6
8 48.71 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 Meet 6,7
9 41.04 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 Meet 7,8
10 39.46 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31-33-35-37-39-
41-43-45-47-49-51-53-55-57-59-61-63-65-67-69-71-73-75-77-79
Meet 7,8,9
11 28.20 01-03-05-07-09-11-13-15-17-19-21-23-25-27-29-31-33-35-37-39-
41-43-45-47-49-51-53-55-57-59-61-63-65-67-69-71-73-75-77-79
Meet 9,10
12 27.49 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 Meet 10,11
13 17.28 80-04-08-12-16-20-24-28-32-36-40-44-48-52-56-60-64-68-72-76 Meet 11,12
14 16.67 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 Meet 11,12,13
15 5.71 02-06-10-14-18-22-26-30-34-38-42-46-50-54-58-62-66-70-74-78 Meet 13,14,apex (pole)

Rose Sphere 840-80 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 15 (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 1-15 sequence on the second hemisphere.

If you cut a Rose Sphere 840-80 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