Inside the slots, there are reinforced type plastic made vanes or fins. While the shaft is rotating this plastic types of vanes or fins are capable of sliding or moving inside the slots very easily without any friction, restriction or dent. These fins are made from such a type of material that these are strong as well as light. So a huge amount of force also can not cause any damage to it. Lightness is required to reduce the required amount of necessary momentum during using it.
It is being designed in such a way that the vanes resting shaft’s diameter is just slightly lower than the inside diameter of the casing. In most of the portions inside the casing, there is a very less clearance in between the shaft & casing but in one side there is some gap for allowing the one vane to be little-bit come-out during the rotation. So that the compressed air can get some area of the vanes to apply a force on the vanes.
As the centre point of the shaft is fixed so this pushing effect on the plastic vane is being transmitted to the shaft very easily which one results in the shaft to be evolved. These plastic vanes have got such a type of durability. To complete one full revolution of the shaft every single piece of fins must be passing through that place.
According to the direction of the switch, the shaft can be rotated in ahead or astern direction. By changing the position of the switch the direction of the air channel will also be altered. Normally there are two holes by which the direction of air flow can be altered. Air goes inside the casing through one hole & it gets drained through other holes.
In such a case the shaft revolves in one direction which one might be ahead or astern. By changing or altering the position of the switch we can change or alter the direction of air channel inside the casing. Which one would cause the rotor to rotate in the opposite direction of the previous step? On the last case now air passage inside the casing will be altered. So the air impact wrench has always got passage of draining.
If there is any sort of moisture, water or excessive residual oil on the air then these would be drained through that draining passage also. But it is always preferable to use moisture or rust free compressed air to increase the running hour of the air impact wrench. From this above description, we can easily understand that how does work an air impact wrench."
