# Shared Flashcard Set

## Details

Tolerance Analysis
16
Mechanical Engineering
Not Applicable
01/14/2018

Term
 In stacks that go left and right, which direction is positive?
Definition
 Right
Term
 In stacks that go up and down (radial stacks), which direction is positive?
Definition
 Up
Term
 What is another term for stacks that go up and down?
Definition
Term
 What are the basic steps that make up the process of tolerance analysis?
Definition
 Identify what requirement is under test Identify all dimensions that contribute to the gap Assign each dimension a positive or negative value Decide which routes will be factors in the analysis Decide which tolerances will be the biggest factors Add all positive and negative dimensions to calculate mean gap Add the sum of the equal bilateral tolerances to the mean gap to determine maximum gap Subtract the sum of the equal bilateral tolerances from the mean gap to determine minimum gap
Term
 True or false: Correct routes give the largest min gap and the smallest max gap.
Definition
 True
Term
 True or false: never take the shortest route
Definition
 False, always take the shortest route
Term
 True or false: tolerance analysis methods change depending on the type of tolerance on a dimension (equal, unequal, unilateral)
Definition
 False, the methods are the same
Term
 What is the meaning of a virtual condition?
Definition
 An inner or outer tolerance boundary that remains constant.
Term
 What is the meaning of a resultant condition?
Definition
 The "worst case" of a non-constant inner or outer tolerance boundary
Term
 What is the virtual condition of the shaft? [image]
Definition
 20.5 mm
Term
 What is the resultant condition of the shaft? [image]
Definition
 20.2 mm
Term
 True or false: resultant conditions are generated on the opposite side of virtual conditions
Definition
 True
Term
 Why are resultant and virtual conditions important in tolerance analysis?
Definition
 They are used to create equal bilateral tolerances from feature control frames that use MMC and LMC.
Term
 What is a factor that can ruin virtual or resultant condition calculations?
Definition
 If the derived median line of the feature is not straight
Term
 What are the steps to convert an unequal tolerance to a equal tolerance?
Definition
 Find the upper tolerance limit Find the lower tolerance limit Add the two values and divide by two to get the mean Subtract the lower tolerance limit from the upper tolerance limit Divide by to to get the ± tolerance
Term
 What tolerance is placed on basic dimensions?
Definition
 Zero. Instead, tolerances affect the features themselves by calculating the virtual and resultant conditions.
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