What is a major difference between linear and angular tolerances in GDandT?

• A. Linear tolerances are measured directly in length
• B. Angular tolerances apply only to circular features
• C. Linear tolerances control straight dimensions, while angular tolerances control angles
• D. Angular tolerances are less critical than linear tolerances

Answer: (C)

Linear tolerances control straight dimensions, defining the permissible variation in the length of components or features. This means when you measure a linear feature, like the length of a shaft or the width of a slot, you are concerned with how much that measurement can deviate from the specified dimension without affecting the function of the part.

On the other hand, angular tolerances pertain to the permissible variation in the angle between surfaces or features. They dictate how much an angle can differ from its specified value, ensuring that parts fit and function as intended when assembled with other components.

Understanding that linear tolerances focus on length and dimension while angular tolerances are specifically concerned with angles is fundamental in dimensioning and tolerancing practices in manufacturing. This distinction is crucial for ensuring proper assembly and function of mechanical components.