30 Questions
What is the difference between upper deviation and lower deviation?
Upper deviation is the difference from minimum size, while lower deviation is the difference from maximum size
What does bilateral tolerance mean?
Variation allowed on either sides of the zero line
What is the fundamental deviation?
The deviation closest to the basic size
What does positive allowance mean in terms of holes and shafts?
There is minimum clearance between the parts
In unilateral tolerance, where is variation allowed?
Only on one side of the zero line
What does negative allowance result in?
Interference between shaft and hole
What type of fit may result in either a clearance or interference condition?
Transition fit
In an interference fit, the allowance is:
Always negative
What is the interference between the largest shaft and the smallest hole?
0.009"
Which type of fit is called for when accurate alignment is critical?
Transition fit
What amount of actual interference exists between the smallest shaft and the largest hole?
0.0007"
What is the significance of a slip or push fit?
Facilitates self-alignment of parts
What is the purpose of the GD&T method?
To control location, form, profile, orientation, and runout on a dimensioned feature
In the hole-basis system, what is considered the basic size?
Minimum hole size
In the GD&T system, what does the 'h' denote?
Basic size of the shaft
What is the symbol denoting the hole-basis system?
'H'
How is the maximum shaft size determined in the hole-basis system?
Subtracting an allowance from the basic hole size
What is the minimum clearance value in the GD&T hole and shaft system?
0.002"
How are tolerances applied to the hole and shaft in the GD&T system?
To both the hole and shaft
What is the purpose of applying different tolerances to the hole and shaft in the hole-basis system?
To achieve minimum and maximum dimensions for both hole and shaft
Which deviation is associated with the shaft-basis system?
Upper deviation
What type of industries commonly use the GD&T system?
Industries using bright bars as raw material
What is a key advantage of the hole-basis system according to the text?
Fixed dimensions for holes and shafts
Why is the GD&T method especially useful in quantity production of interchangeable parts?
To ensure proper assembly and interchangeability of parts
What type of fit allows for loose mating and free movement between parts?
Clearance fit
In which type of fit does the internal member have a larger size than the external member?
Interference fit
What is the minimum air space in a clearance fit according to E.G. Anas ME 414?
0.002 inches
Which type of fit requires some degree of force to join two components?
Interference fit
What is the purpose of using an interference fit?
To create a tight connection between components
Where would you find examples of a clearance fit according to the text?
Bolt/shaft holes
Test your knowledge on Geometric Dimensioning and Tolerancing (GD&T) terminology. Learn key definitions such as zero line, upper deviation, lower deviation, tolerance zone, and unilateral tolerance.
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