In order for a door hinge to operate normally, it is important for it to rotate smoothly and without any resistance when opening and closing the door. However, if there is insufficient lubrication between the two surfaces, it can result in friction and generate unwanted noise. This noise occurs due to the grinding of iron in the hinge of the door shaft. To resolve this issue, one can apply a sufficient amount of lubricant, such as engine oil or cooking oil, onto the door shaft hinge. By dripping and distributing the oil evenly, and then repeatedly opening and closing the door, the noise can be eliminated. It is crucial to ensure that the hinge is well lubricated to guarantee a smooth and noiseless operation.
Adding appropriate additives to edible oil is necessary to enhance its performance and prevent machine wear. Unlike regular lubricating oil that stays longer, edible oil loses quickly due to the lack of viscosity index improvers, anti-rust antioxidants, and friction reducers. However, both lubricants share a common goal of reducing friction between two surfaces that come into contact with each other. They also provide heat resistance to the machines they are used in, which helps them last longer.