Geometric Tolerances in Machined Parts: What Changes Between Aluminium and Plastics?

In precision CNC machining, achieving tight geometric tolerances is essential to ensure the quality, functionality and reliability of components. However, the differences between aluminium and engineering plastics require distinct machining strategies.

Aluminium: Precision and Dimensional Stability

Aluminium stands out for its rigidity, dimensional stability and excellent machinability, enabling the production of components with complex geometries and demanding tolerances.

However, factors such as internal stresses, the removal of large volumes of material and clamping systems can cause deformation, particularly in large components or thin-walled parts.

An appropriate machining strategy is essential to meet flatness, parallelism, perpendicularity and dimensional accuracy requirements.

Engineering Plastics: Greater Sensitivity to Machining Conditions

Engineering plastics present specific challenges due to their lower rigidity, higher thermal expansion and, in certain materials, moisture absorption.

These characteristics can lead to dimensional changes during and after machining, requiring particular attention to cutting parameters, tooling and clamping systems.

Temperature control and the minimisation of mechanical stresses are key factors in ensuring the geometric stability of components.

The Importance of Machining Strategy and Dimensional Inspection

Regardless of the material, achieving tight tolerances depends on a combination of technical expertise, precision CNC equipment and dimensional inspection.

At TecnoLanema, each project is analysed according to the material properties, geometric complexity and technical requirements specified by the customer.

With 3-axis and 5-axis CNC machining capabilities and 3D metrology equipment, we carry out dimensional inspections throughout the different production stages, enabling early detection of deviations and verification of component conformity.

Precision begins with material selection and is reinforced at every stage of the machining process.

TecnoLanema: Precision Tailored to Each Material

With extensive experience in machining aluminium and engineering plastics, TecnoLanema develops solutions for demanding industrial sectors where quality, precision and reliability are essential.

Do you have a project with demanding geometric tolerances? Contact our technical team and discover how we can support your project.