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1. Spur Gear
This is a cylindrical shaped gear in which the teeth are
parallel to the axis. It has the largest applications and,
also, it is the easiest to manufacture.
2. Helical Gear
This is a cylindrical shaped gear with helicoid teeth. Helical
gears can bear more load than spur gears, and work more
quietly. They are widely used in industry. A disadvantage is the
axial thrust force the helix form causes.