Why Do Tolerances on Part Dimensions Matter?

               One of the most critical aspects of part design in manufacturing is specifying tolerances on part dimensions. Tolerances define the acceptable deviation range in a part’s size, ensuring that components fit together as intended within an assembly. Understanding the significance of tolerances affects the final product’s functionality and influences manufacturing efficiency and cost-effectiveness.

What are tolerances?

               Tolerances indicate the allowable variation between a part’s maximum and minimum sizes. This information is vital for engineers because it determines how well a part will fit within a larger assembly of components. Without specified tolerances, dimensions remain unclear, which can lead to parts that are either too loose or too tight, making them unusable in practical applications. Properly defined tolerances ensure that components fit together correctly, whether in a sliding fit, press fit, or other assembly types.

               While it may seem logical that tighter tolerances lead to better quality, this is not always true. Achieving excessively tight tolerances can significantly increase manufacturing costs without necessarily enhancing product performance. The key lies in finding the right balance that ensures quality while avoiding unnecessary expenditures. Several factors influence tolerance control, such as part size, complexity, material properties, and thickness. These elements have a direct impact on the chosen manufacturing process for production. An effective manufacturing strategy must consider these variables to optimize quality and reduce costs.

Optimal Tolerances for Soft Materials

               Determining the optimal tolerance for soft materials can be particularly challenging. The extent to which a soft material may undergo permanent deformation during manufacturing plays a crucial role in establishing realistic tolerances. Standard engineering templates often use block tolerances that may be too rigid for soft materials, resulting in complications.

               At PGC, our Application Engineers are ready to support you on your part-development journey. We offer valuable insights and resources, including standardized tolerance information from the Association for Rubber Products Manufacturers (ARPM). This organization has developed conservative, safe-to-manufacture tolerances for non-metallic materials, including solid and cellular rubbers.  For specialized applications that require tighter tolerances, our experienced team can create a customized plan to meet those specifications without compromising the integrity of the manufacturing process.

Who Determines Tolerances?

               At PGC, our engineers concentrate on assisting you in specifying the critical tolerances essential for your design. We collaborate with you to evaluate the feasibility of suggested tolerances and propose alternatives when necessary. We aim to uphold system quality while controlling costs, ensuring a seamless transition from concept to production. Understanding and implementing the correct tolerances in your part dimensions is essential for successful manufacturing and assembly.

               Don't hesitate to contact us today if you’re ready to discuss your application and discover how our expertise can support your design needs. Together, we can ensure that your parts are manufactured to the highest standards of quality and precision.