Tolerance Considerations For Non-standard Design Parts

DALIAN, China - Aug. 21, 2023 - PRLog -- Tolerance plays a crucial role in the manufacturing industry. Appropriate tolerances can enhance product performance and reliability, reduce failure rates, and ensure proper fitting and functionality of parts. Larger tolerance ranges imply lower manufacturing precision requirements, thereby reducing manufacturing difficulty and costs. Choosing suitable tolerance ranges, while ensuring product quality and performance, contributes to lowering manufacturing costs.

There are various types of tolerance for the geometric parameters of a part, including dimension tolerance, form tolerance, and position tolerance.

Types Of Tolerance

1. Dimension Tolerance:

It refers to the allowable variation in dimensions and is equal to the algebraic difference between the maximum and minimum limits of a dimension.

2. Form Tolerance:

It represents the total allowable variation in the shape of a single actual feature, including straightness, flatness, roundness, cylindricity, and profile of a line and profile of a surface (6 items in total).

3. Position Tolerance:

It refers to the total allowable variation in the positional relationship of associated actual features to a datum. It restricts the mutual positional relationships between two or more points, lines, or surfaces on a part, including parallelism, perpendicularity, inclination, coaxiality, symmetry, position, circular runout, and total runout (8 items in total). Tolerance specifies the manufacturing precision requirements for a part and reflects the level of difficulty in its production.

Geometric tolerance

Shape tolerance and position tolerance are collectively referred to as geometric tolerance, and these types of errors can impact the functionality of mechanical products. When designing, the selection of geometric tolerance should follow the following principles:

Functionality and Performance:

The chosen geometric tolerance should ensure that the mechanical product functions as intended and meets its performance requirements. It should not compromise the product's performance or safety.

Cost-effectiveness:

While tighter geometric tolerances may improve precision, they can also increase manufacturing costs significantly. It is essential to strike a balance between the required precision and the associated manufacturing expenses.

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