In BIS notation, what does the numerical value preceding the tolerance symbol indicate?
The basic size of the component specified in the drawing
In BIS (Bureau of Indian Standards) notation, the system of specifying tolerances and fits is used to communicate design intent and ensure the interchangeability of components. The numerical value preceding the tolerance symbol in BIS notation represents the basic size of the component, which is the design or nominal size specified on the drawing. Let's examine why this option is correct and rule out the others:
- Basic Size of the Component: The basic size is the starting point from which tolerances and dimensions are applied. It does not include any of the tolerances or deviations. After determining the basic size, tolerances specify the permissible limits of variation.
- The Difference Between Upper and Lower Limits of Size: This describes the tolerance of a component, not the basic size. Tolerance is the total range of size that is considered acceptable during the inspection.
- The Tolerance Value Obtained During Inspection Process: This option confuses what the value represents. The tolerance value is the allowable deviation from the basic size, whereas the numerical value preceding the tolerance symbol specifies the basic size itself.
- The Actual Size Obtained After Manufacturing Process: This indicates the final measurement after production. The basic size specified in the drawing serves as the target or nominal dimension, not the actual size.
Therefore, the correct answer is: The basic size of the component specified in the drawing.
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Important Questions from Limits and Fits
The following limits are specified in a limit system, to give a clearance fit between a hole and a shaft:
\(Hole = 25_{ - 0.01}^{ + 0.02}\;mm\;and\;shaft = 25_{ - 0.02}^{ - 0.004}\;mm\)
Determine tolerance on a shaft.
When tolerance is given on one side of the basic dimension, it is called:
In a hole and shaft tolerance system, the small letter indicates fundamental deviation of________
Which of the following fit is produced with the shaft dia 25.025 and bore dia of 24.994?
In mass production, parts made to definite limit of error is called as ______
