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. |