My first concave faceted gemstone



Simple Jack cut with flat facets (right)
compared with same cut (left) with
eight concave facets carved on the pavilion facets

Concave facets performed by hand using a Dremel and Nova miniature points
Aug. 2012

Pavilion redone using the Fantasy Machine
Various concave facets made using cylindrical and ball mandrels


Pavillion
90.00 96-12-24-36-48-60-72-84
43.00 96-12-24-36-48-60-72-84

Concave
grind: LL or ceramic - Diamond 1200 - ~5 min.
polish: maple or KKCeOx - CeOx - ~3 min.

3 mm reciprocation
6 mm ball mamdrel
50.00 96-24-48-72
Y-DI: 0/0 - Mast H: 88.10 mm Cheat:: 1.3

57.00 96-24-48-72
Y-DI: 4/0 - Mast H: 76.80 mm Cheat:: 1.3


8mm cylindrical mandrel
45.00 12-24-36-48-60-72-84-96
Y-DI: 0/0

6 mm ball mandrel
57.00 12-36-60-84
Y-DI: 0/0 - Mast H: 77.35 mm Cheat:: 4.1
Y-DI: -50/0 - Mast H: 77.25 mm Cheat:: 3.1
Y-DI: -0/1 - Mast H: 77.10 mm Cheat:: 2.1
Y-DI: -50/1 - Mast H: 76.95 mm Cheat:: 1.1
Y-DI: 0/2 - Mast H: 76.80 mm Cheat:: 1.1
Y-DI: -50/2 - Mast H: 76.70 mm Cheat:: 0.1
Y-DI: 0/2 - Mast H: 76.80 mm Cheat:: 1.1
(should use X-DI instead of Cheat next time)

11 mm cylindrical mandrel
41.00 6-18-30-42-54-66-78-90
Y-DI: 0/0 - Cheat:: 1.1

Crown
29.00 96-12-24-36-48-60-72-84
25.00 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93



Handy Fantasy Machine Attachment

Rubber band for the long faceting times in the FM


Beale/Woolley Depth of Cut Indicator
Adding an ohmmeter to the mast seems to be a useful feature to the Fantasy Machine.
In regular flat faceting the ohmmeter doesn't seem to add any advantage
over the Digital Angle dial Indicator (DAD).
But, doing concave facets it seems to integrate the flashing reading of the DAD
and give a good indicator of progress of the depth of cut.