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Questions and Answers
What is the maximum allowable deviation from the specified or nominal value?
What is the maximum allowable deviation from the specified or nominal value?
Which type of tolerance has both upper and lower limits?
Which type of tolerance has both upper and lower limits?
What is the region within which a feature must lie to meet the specified tolerance?
What is the region within which a feature must lie to meet the specified tolerance?
What is the cumulative effect of multiple tolerances on a feature or assembly?
What is the cumulative effect of multiple tolerances on a feature or assembly?
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What type of tolerance applies to the shape, orientation, or location of a feature?
What type of tolerance applies to the shape, orientation, or location of a feature?
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What is the primary factor that affects the tolerance of a material?
What is the primary factor that affects the tolerance of a material?
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What is the primary benefit of using tolerance in engineering design?
What is the primary benefit of using tolerance in engineering design?
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What classification of tolerance is based on the type of fit required?
What classification of tolerance is based on the type of fit required?
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Study Notes
Engineering Tolerance
Definition
- Engineering tolerance refers to the permissible limit or allowance for variation in the dimensions, properties, or quality of a material, component, or assembly.
- It is the maximum allowable deviation from the specified or nominal value.
Types of Tolerances
- Limit Tolerance: The maximum and minimum limits within which a dimension or property must lie.
- Bilateral Tolerance: A tolerance that has both upper and lower limits, e.g., ±0.1 mm.
- Unilateral Tolerance: A tolerance that has only one limit, e.g., +0.1 mm or -0.1 mm.
- Geometric Tolerance: A tolerance that applies to the shape, orientation, or location of a feature.
Tolerance Representation
- Tolerance Zone: The region within which a feature must lie to meet the specified tolerance.
- Tolerance Stack-up: The cumulative effect of multiple tolerances on a feature or assembly.
Tolerance Classification
- Fit Classes: Classes of tolerances based on the type of fit required, e.g., clearance, interference, or transition fit.
- Tolerance Grades: Classes of tolerances based on the level of precision required, e.g., coarse, medium, or fine.
Factors Affecting Tolerance
- Material Properties: The properties of the material, such as thermal expansion, can affect the tolerance.
- Manufacturing Process: The process used to manufacture the component or assembly can affect the tolerance.
- Assembly Conditions: The conditions under which the assembly is put together can affect the tolerance.
Importance of Tolerance
- Ensures Interchangeability: Tolerance ensures that components from different manufacturers can be interchangeable.
- Improves Quality: Tolerance helps to maintain the quality of the product by ensuring that it meets the specified requirements.
- Reduces Costs: Tolerance can help to reduce costs by minimizing the need for rework or scrap.
Engineering Tolerance
- Engineering tolerance refers to the permissible limit or allowance for variation in the dimensions, properties, or quality of a material, component, or assembly.
Types of Tolerances
- Limit Tolerance: the maximum and minimum limits within which a dimension or property must lie.
- Bilateral Tolerance: a tolerance that has both upper and lower limits, e.g., ±0.1 mm.
- Unilateral Tolerance: a tolerance that has only one limit, e.g., +0.1 mm or -0.1 mm.
- Geometric Tolerance: a tolerance that applies to the shape, orientation, or location of a feature.
Tolerance Representation
- Tolerance Zone: the region within which a feature must lie to meet the specified tolerance.
- Tolerance Stack-up: the cumulative effect of multiple tolerances on a feature or assembly.
Tolerance Classification
- Fit Classes: classes of tolerances based on the type of fit required, e.g., clearance, interference, or transition fit.
- Tolerance Grades: classes of tolerances based on the level of precision required, e.g., coarse, medium, or fine.
Factors Affecting Tolerance
- Material Properties: the properties of the material, such as thermal expansion, can affect the tolerance.
- Manufacturing Process: the process used to manufacture the component or assembly can affect the tolerance.
- Assembly Conditions: the conditions under which the assembly is put together can affect the tolerance.
Importance of Tolerance
- Ensures Interchangeability: tolerance ensures that components from different manufacturers can be interchangeable.
- Improves Quality: tolerance helps to maintain the quality of the product by ensuring that it meets the specified requirements.
- Reduces Costs: tolerance can help to reduce costs by minimizing the need for rework or scrap.
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Description
Learn about engineering tolerance, its definition, and types including limit and bilateral tolerance. Understand the permissible limits for variation in dimensions and properties.
