18 Questions
What is the difference between the nominal dimension and the upper and lower limit of size?
Tolerance
What is the acceptable range for a precision cylindrical part?
The range is usually much smaller for mating cylindrical parts
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
What is the upper limit of size minus the lower limit of size in a dimension with a tolerance of ±0.020 in?
0.020 in.
In aircraft drawings, what is the dimension tolerance assumed for a dimension given as a common fraction?
±1/64 in.
What is the difference between the upper and lower limit of size in a dimension with a tolerance of ±0.0005 in?
0.0010 in.
What is the purpose of an allowance in mating cylindrical parts?
To provide a difference between the maximum material limits of mating parts
What is the maximum material limit of a bolt?
The maximum diameter of the bolt
What is the result of a maximum diameter of a bolt being 0.001 in. less than the minimum diameter of the hole?
Positive allowance
What is the purpose of a clear system of labelling in precision tooling and equipment?
To indicate the inspection or calibration period
What information should a label on precision tooling and equipment show?
The date last tested, the next inspection or calibration date, and the authorised person's signature or stamp
What is the result of a maximum diameter of a bolt being 0.001 in. greater than the minimum diameter of the hole?
Negative allowance
What is the purpose of a nominal dimension in an aircraft drawing?
To state the size of a part as specified on the drawing
What is the difference between the nominal dimension and the upper and lower limits of size?
Tolerance
What is the purpose of upper and lower limits of size in precision cylindrical parts?
To ensure proper fit and function of a part
What is the symbol used to represent inches in drawings and dimensional specifications?
″ (double prime symbol)
What is the range of sizes within which a part is considered acceptable?
Upper and lower limits of size
Why is it important to consider tolerance when manufacturing precision cylindrical parts?
To ensure proper fit and function of a part
Test your understanding of allowances and tolerances in mechanical engineering, including maximum material limits, diameter limits, and prescribed differences between mating parts. Learn how to apply these concepts to design and manufacture precise mechanical components. Improve your skills in engineering design and manufacturing.
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