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How To Calculate Number of Teeth In Spur Gear

Want to know how you can calculate the teeth in spur gear? Look no further! Keep reading this guide to learn more. 

Spur gears are cylindrical equipment with teeth cut in parallel to its rotational axis, which are very important in its overall function and efficiency. 

The spur gears are used in various industrial equipment or machinery due to their high efficiency and low backlash. 

When we talk about the teeth of a spur gear, they are quite significant because they are the means of transferring the force or movement from one component of a machine to another quite easily. 

The number of teeth in a spur gear greatly influences its function in any machinery; the greater the force, the greater the spur gear. The number of teeth varies with increasing or decreasing force as well.

Normal spur gears have up to 17 teeth on average. However, here are simple steps that will allow you to calculate the number of teeth in a spur gear

  • First of all, you need to check out the machine you need the gear for. 
  • Based on that, you need to find out a gear with a specific outer diameter. 
  • The formula for the number of teeth is N = P D or N = ( π D ) / p  where
    • P = Diametral pitch
    • p = Circular pitch
    • N = number of teeth
    • D = Pitch diameter
    •  Π = 3.14 

This formula will give you the calculation of the number of teeth in a spur gear. Other than the above formula, sometimes, tooth depth and tooth thickness also need to be measured as they too play an essential role in the process. 

Tooth depth is the difference between the tip of the tooth and the root of the tooth. 

Other than that, spur gears on a general hold a lot of importance since they have a small size, but their function is quite significant in the functioning of many machines. 

They are used in many mechanical applications for the purpose of decreasing or increasing the speed of a device or for multiplying the torque by the transmission of motion and power from one shaft to another shaft through a series of mated gears. 

They are also used in

  • Conveyor systems
  • As speed reducers
  • In engines 
  • In gear pumps and motors 
  • Many machining tools

They are simple, easy to restrain; they are highly accurate in their function and can easily increase or decrease the speed of the shaft. They are also cost-effective, which makes them an attractive tool for many engineers out there.