ชุดเฟืองพลาสติก 81 ชนิด 81 kinds of plastic gear bag

81 types without repetition, including spur gears, sector teeth, crown teeth, racks, worms, pulleys, transmission belts (20 transmission belts are only one type) 

DIY guide
(1) Gear diameter calculation formula: gear outer diameter (addendum circle) = (number of teeth + 2) * modulus
(2) If it is a 2mm shaft with a tightly matched gear, please choose a gear with a 1.9mm hole;
With loose gears, it can slide freely. Please choose gears with 2.05mm holes;
In other words, select a 0.1mm smaller gear for tight matching and 0.05mm larger gear for loose matching;
Colour:white
Material:plastic

Package Contents:
81 x gear packs