Spiral Bevel Gear
Spiral bevel gears are bevel gears with curved tooth lines. Due to higher tooth contact ratio, they are superior to directly bevel gears in performance, strength, vibration and noise. On the other hand, they are more challenging to produce. Also, as the tooth are curved, they trigger thrust forces in the axial route. Within the spiral bevel gears, the one with the zero twisting position is called zerol bevel gear.
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Bevel Gear
Bevel gears have a cone shaped physical appearance and are being used to transmit induce between two shafts which intersect for one level (intersecting shafts). A bevel gear has a cone as its pitch surface and its own teeth are trim 
along the cone. Varieties of bevel gears incorporate direct bevel gears, helical bevel gears, spiral bevel gears, miter gears, angular bevel gears, crown gears, zerol bevel gears and hypoid gears.
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Gear Rack
Same sized and shaped teeth trim at equivalent distances along a flat surface or a direct rod is named a gear rack. A gear rack is normally a cylindrical equipment with the radius of the pitch cylinder currently being infinite. By meshing with a cylindrical equipment pinion, it converts rotational motion into linear movement. Gear racks could be broadly divided into straight tooth racks and helical tooth racks, but both include straight tooth lines. By machining the ends of equipment racks, you’ll be able to connect gear racks end to get rid of.
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Helical Gear
Helical gears are used with parallel shafts comparable to spur gears and so are cylindrical gears with winding tooth lines. They possess better pearly whites meshing than spur gears and have superior quietness and can transmit larger loads, making them well suited for high velocity applications. When working with helical gears, they create thrust force in the axial route, necessitating the application of thrust bearings. Helical gears come with right hands and left palm twist requiring opposite hands gears for a meshing couple.
This is how helical worm gear could be used for your advantage.