Question

The allowance provided in between a hole and a shaft is calculated from the difference between

• A. lower limit of the shaft and the upper limit of the hole
• B. upper limit of the shaft and the upper limit of the hole
• C. upper limit of the shaft and the lower limit of the hole
• D. lower limit of the shaft and the lower limit of the hole

Hint:

When designing parts that fit together, ensure that the allowance is correctly calculated to maintain proper clearances for easy assembly and operation.

Answer 1

The Correct Option is C

In engineering tolerances, the allowance is the intentional difference between the dimensions of a mating pair, such as a hole and shaft. The allowance is calculated as the difference between the upper limit of the shaft and the lower limit of the hole. This ensures that there is a specified gap or clearance between the two components, which is crucial for proper fitting.

- The upper limit of the shaft represents the largest permissible size of the shaft.
- The lower limit of the hole represents the smallest permissible size of the hole.

Thus, the correct answer is (C).