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Eng Design(L11) Dimensions & Tolerance - Coggle Diagram
Eng Design(L11) Dimensions & Tolerance
Rules of Dimensioning
Ensure dimension lines, extension lines, and object outlines do not cross or overlap.
Avoid dimensioning to hidden lines or features.
Do not duplicate dimensions across different views or give the same information in multiple ways.
Tolerance
The Importance of Tolerance
Avoids Unrealistic Precision: Without tolerance, parts must be made to exact measurements, leading to high rejection rates.
Guides Manufacturing Methods: Tolerance determines the precision required, affecting the choice of manufacturing processes.
Ensures Interchangeability: It allows parts made by different manufacturers to fit and function properly together.
Supports Proper Assembly: Tolerance ensures mating parts fit and work as intended in an assembly.
Types of Tolerance
Bilateral Tolerance: Variation is allowed in both directions (e.g., ±0.1 mm), not necessarily equally.
Unilateral Tolerance: Variation is allowed in only one direction from the nominal size (e.g., +0.2 / -0.0 mm).
Limit Tolerance: Specifies the maximum and minimum acceptable values (e.g., 9.8 mm – 10.2 mm).
Calculating Tolerance
Tolerance = Upper limit – Lower Limit
In Autodesk360
Assembling Multiple Parts
Clearance Fit
Allows movement between parts, such as a door hinge, with space between mating surfaces.
Interference Fit
Parts are tightly fitted with no gap, requiring force to assemble or disassemble, like a shaft pressed into a bearing.
Dimensions
9.Dimensioning Angles
8.Dimensioning of Circle, Arc, and Hole
7.Dimensioning of Radius
6.Dimensioning of Multiple Features
5.Dimensioning Small Features
4.Combined Dimensioning
3.Chain Dimensioning
2.Superimposed Running Dimensioning
1.Parallel Dimensioning
