Fits in hindi || Part 2 || interference fit And Transition fit in hindi || Types of fits ||

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Limits Fits and Tolerance
Two extreme permissible sizes of a part between which the actual size is contained are called limits. The relationship existing between two parts which are to be assembled with respect to the difference on their sizes before assembly is called a fit. Tolerance is defined as the total permissible variation of a size. It is the difference between maximum limit and minimum limit of size.
Fits
When two parts are to be assembled the relation resulting from the difference between their sizes before assembly is called a fit. The fit signifies the range of tightness or looseness which may result from the application of a specific combination of allowances and tolerances in the design of mating parts.
1. Clearance fit: A clearance fit is one having limits of size so prescribed that a clearance always results when mating parts are assembled.
2. Interference fit: An interference fit is one having limits of size so prescribed that an interference always results when mating parts are assembled.
3. Transition fit: A transition fit is one having limits of size so prescribed that either a clearance or interference may always result when mating parts are assembled.
Basic size: It is the exact theoretical size arrived at by design. It is also called nominal size.
Actual size: The size of a part as may be found by measurement.
Maximum limit of size: The greater of the two limits of size.
Minimum limit of size: The smaller of the two limits of size.
Allowance: It is an intentional difference between maximum material limits of mating parts. It is a minimum clearance or maximum interference between mating parts.
Deviation: The algebraic difference between a size (actual, maximum, etc.) and the corresponding basic size.
Actual deviation: The algebraic difference between the actual size and the corresponding basic size.
Clearance: It is the positive difference between the hole size and the shaft size.
Maximum clearance: The positive difference between the maximum size of a hole and the minimum size of a shaft.
Minimum clearance: The positive difference between the minimum size of a hole and the maximum size of a shaft.at are different types of fits?
The three main categories are:
Clearance fit.
Transition fit.
Interference fit.
How much should my press fit tolerance be?
However, the diameter isn't the only tolerance to consider: Pins often come in pairs, so consider the distance between the pins, too. Second rule of press fits: never more than two pins per assembly operation. Even better, use only one interference fit and align the parts with a slip-fit second pin.
How is tolerance calculated?
TOLERANCE :Tolerance is the allowable variation for any given size in order to achieve a proper function. Tolerance equals the difference between lower and upper limit dimensions. Example; for 0.500-0.506 inch the tolerance would be 0.006 inch.