Faceting Equipment
From The Gemology Project
Overall Equipment List
Faceting Machines
Types of Machines
Mast Type
Platform Type
Quadrant Type
Portable (Hand-powered)
Setting up the Machine
Adjustment & Maintenance
Necessary Tools
Articles on Adjustment & Calibration
Machine Accessories
Dops
Index Gears
Gear | Symmetries | How Common | Angle Between Gears | Notes |
---|---|---|---|---|
120 | 3, 4, 5, 6, 8, 10, 12 | 135/4307 = 3.1% | 3 | This is also an important gear. It produces a lot of the same symmetries as the 80 gear, but with more teeth. Many specialized designs are produced for this gear because allows the most index settings. |
108 | 3, 4, 6, 9, 12 | 0 | 3.33 | This gear would only be for custom designs. Capable of producing 9-fold symmetry. Most manufacturers do not even produce this gear |
96 | 3, 4, 6, 8, 12, 16, 24 | 2812/4307 = 65.3% | 3.75 | This is by far the most common gear used. It contains a large number of symmetries. It can reproduce all designs produced for a 32 gear by multiplying by 3. It can produce some designs produced for a 64 gear, as long as those designs only use the even numbered teeth – in which case you multiply by 1.5. |