In manufacturing process after manufacturing the product we need to check the dimensions of the product.
But any manufacturing process is not perfect to produce the product with exact dimensions means higher accuracy. It means we shall be getting the errors on the dimensions of the product. Some time we shall be getting the dimensions more than the required dimensions and some time we shall be getting dimensions less than the required dimensions. So, no manufacturing process is perfect to get perfect dimensions for a required product.
After manufacturing process even if you are getting the errors in the dimensions of the product, those errors can be acceptable up to certain limit. These limits are decided during the designing process. Here the limits means during the designing process certain maximum and minimum dimensional values will be given to compensate the errors that we are getting on the dimensions of the product. If the final dimensions of the product is lying in between that limit values, then the product can be useful for the required assembly. So, permissible variations are allowed on the dimensions of any product.
The permissible variation that can be allowed on the dimensions of the product is known as Tolerance. The tolerance is designated by IT. The tolerance is given to the dimension of the product in terms of Upper Limit and Lower Limit. From these limits we can have the maximum size and minimum size of any product.
The limits and fits are explained by taking the assembly of shaft and hole assembly for easy understanding purpose. There is special terminology is there to understand limits and fits by a simple shaft and hole assembly.
But any manufacturing process is not perfect to produce the product with exact dimensions means higher accuracy. It means we shall be getting the errors on the dimensions of the product. Some time we shall be getting the dimensions more than the required dimensions and some time we shall be getting dimensions less than the required dimensions. So, no manufacturing process is perfect to get perfect dimensions for a required product.
After manufacturing process even if you are getting the errors in the dimensions of the product, those errors can be acceptable up to certain limit. These limits are decided during the designing process. Here the limits means during the designing process certain maximum and minimum dimensional values will be given to compensate the errors that we are getting on the dimensions of the product. If the final dimensions of the product is lying in between that limit values, then the product can be useful for the required assembly. So, permissible variations are allowed on the dimensions of any product.
The permissible variation that can be allowed on the dimensions of the product is known as Tolerance. The tolerance is designated by IT. The tolerance is given to the dimension of the product in terms of Upper Limit and Lower Limit. From these limits we can have the maximum size and minimum size of any product.
The limits and fits are explained by taking the assembly of shaft and hole assembly for easy understanding purpose. There is special terminology is there to understand limits and fits by a simple shaft and hole assembly.
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