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Consider the following statements regarding limits and fits 1. Actual size is the standard size for the part and is the same both for the hole and its shaft. 2: Basic size is the dimension as measured on the manufactured part. 3. Deviation is the algebraic difference between a size and the corresponding basic size. Which of the above statements is/are correct ? 

Consider the following statements regarding limits and fits 1. Actual size is the standard size for the part and is the same both for the hole and its shaft. 2: Basic size is the dimension as measured on the manufactured part. 3. Deviation is the algebraic difference between a size and the corresponding basic size. Which of the above statements is/are correct ?  Correct Answer 3 only

Explanation:

Nominal size:

The nominal size of a dimension is the size by which it is referred to as a matter of convenience.

Basic size:

  • The basic size or normal size is the standard size for the part and is the same both for the hole and its shaft. This is the size that is obtained by calculation for strength. (Thus statement 1 is False)

Actual size: 

  • Actual size is the dimension as measured on a manufactured part. As already mentioned, the actual size will never be equal to the basic size and it is sufficient if it is within predetermined limits. (Thus statement 2 is False)

Maximum Limit: The maximum limit or high limit is the maximum size permitted for the part.

Minimum Limit: The minimum limit or low limit is the minimum size permitted for the part.

Zero lines: 

  • In the graphical representation of limits and fits, a zero line is a straight line to which the deviations are referred to. It is the line of zero deviation and represents the basic size.

Deviation: 

  • It is the algebraic difference between size, to its corresponding basic size. It may be positive, negative or zero. (Thus statement 3 is True)
  • Upper deviation: It is the algebraic difference between the maximum limit of size and its corresponding basic size.
  • Lower deviation: It is the algebraic difference between the minimum limit of size and its corresponding basic size.
  • Fundamental deviation: This is the deviation, either the upper or lower deviation, which is the nearest one to zero line.

Tolerance:

  • It is the difference between the upper limit and the lower limit of a dimension.

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