Allowances and Tolerances in Mechanical Engineering

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Questions and Answers

What is the difference between the nominal dimension and the upper and lower limit of size?

  • Fit
  • Tolerance (correct)
  • Allowance
  • Precision

What is the acceptable range for a precision cylindrical part?

  • The range is usually much smaller for mating cylindrical parts (correct)
  • The range is not specified for precision cylindrical parts
  • The range is usually much larger for mating cylindrical parts
  • The range is the same for mating cylindrical parts and sheet metal repairs

What is the purpose of an allowance in sheet metal work?

  • To specify the difference between the nominal dimension of a part and its upper or lower limit (correct)
  • To provide a range of acceptable sizes for a part
  • To specify the nominal dimension of a part
  • To specify the tolerance of a part

What is the upper limit of size minus the lower limit of size in a dimension with a tolerance of ±0.020 in?

<p>0.020 in. (B)</p> Signup and view all the answers

In aircraft drawings, what is the dimension tolerance assumed for a dimension given as a common fraction?

<p>±1/64 in. (C)</p> Signup and view all the answers

What is the difference between the upper and lower limit of size in a dimension with a tolerance of ±0.0005 in?

<p>0.0010 in. (C)</p> Signup and view all the answers

What is the purpose of an allowance in mating cylindrical parts?

<p>To provide a difference between the maximum material limits of mating parts (A)</p> Signup and view all the answers

What is the maximum material limit of a bolt?

<p>The maximum diameter of the bolt (D)</p> Signup and view all the answers

What is the result of a maximum diameter of a bolt being 0.001 in. less than the minimum diameter of the hole?

<p>Positive allowance (A)</p> Signup and view all the answers

What is the purpose of a clear system of labelling in precision tooling and equipment?

<p>To indicate the inspection or calibration period (A)</p> Signup and view all the answers

What information should a label on precision tooling and equipment show?

<p>The date last tested, the next inspection or calibration date, and the authorised person's signature or stamp (C)</p> Signup and view all the answers

What is the result of a maximum diameter of a bolt being 0.001 in. greater than the minimum diameter of the hole?

<p>Negative allowance (C)</p> Signup and view all the answers

What is the purpose of a nominal dimension in an aircraft drawing?

<p>To state the size of a part as specified on the drawing (C)</p> Signup and view all the answers

What is the difference between the nominal dimension and the upper and lower limits of size?

<p>Tolerance (C)</p> Signup and view all the answers

What is the purpose of upper and lower limits of size in precision cylindrical parts?

<p>To ensure proper fit and function of a part (D)</p> Signup and view all the answers

What is the symbol used to represent inches in drawings and dimensional specifications?

<p>″ (double prime symbol) (A)</p> Signup and view all the answers

What is the range of sizes within which a part is considered acceptable?

<p>Upper and lower limits of size (D)</p> Signup and view all the answers

Why is it important to consider tolerance when manufacturing precision cylindrical parts?

<p>To ensure proper fit and function of a part (A)</p> Signup and view all the answers

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