Term
| In stacks that go left and right, which direction is positive? |
|
Definition
|
|
Term
| In stacks that go up and down (radial stacks), which direction is positive? |
|
Definition
|
|
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
|
|
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
|
|
Term
What is the resultant condition of the shaft?
[image] |
|
Definition
|
|
Term
| True or false: resultant conditions are generated on the opposite side of virtual conditions |
|
Definition
|
|
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. |
|
|
