Delrin, also known as Acetal or polyoxymethylene (POM), is a popular engineering plastic utilized in CNC machining applications for its unique material properties and versatility. In this blog post, we will explore the characteristics of Delrin, its advantages, and the many uses of this high-performance plastic. Dive into the world of CNC machining Delrin and learn how to work with this exceptional material effectively.

What is Delrin (Acetal)?

What is Delrin - Working with CNC Machining Delrin (Acetal) Material Properties and Uses-min

Material Properties

Delrin boasts several remarkable properties, making it a popular choice in CNC machining applications.

  • High Mechanical Strength: Delrin exhibits excellent mechanical strength, rigidity, and impact resistance, making it suitable for heavy-duty applications.
  • Low Friction and Wear Resistance: With its low coefficient of friction and high wear resistance, Delrin is an ideal material for components that require smooth motion or sliding properties.
  • Dimensional Stability: Delrin demonstrates exceptional dimensional stability and resistance to creep, even under high loads and temperatures.
  • Chemical Resistance: Delrin is resistant to many chemicals, including water, oil, and various solvents, making it suitable for use in harsh environments.
  • Excellent Machinability: Delrin is easy to machine, enabling the production of intricate parts with tight tolerances and high-quality surface finishes.

Advantages of CNC Machining Delrin

CNC machining Delrin offers several benefits, including:

  • Precision and Complexity: CNC machines can produce complex Delrin parts with high precision and accuracy.
  • Rapid Production: Delrin's excellent machinability allows for the quick production of prototypes and final parts, speeding up the development process.
  • Scalability: CNC machining is suitable for both small-scale and large-scale production of Delrin components.

Uses of Delrin (Acetal) in CNC Machining

Industrial Applications

Delrin's mechanical properties, chemical resistance, and dimensional stability make it a popular choice for various industrial applications.

  • Gears and Bearings: Delrin's low friction and wear resistance make it an ideal material for gears, bearings, and other moving components in machinery and equipment.
  • Bushings: Delrin's self-lubricating properties and dimensional stability make it suitable for bushings used in high-load and high-wear applications.
  • Conveyor Components: Delrin's low friction and wear resistance are advantageous for components in conveyor systems, such as rollers, guides, and chains.

Electronics Industry

Delrin's electrical insulating properties and chemical resistance make it suitable for various electronic applications.

  1. Electrical Insulators: Delrin's excellent electrical insulating properties make it a popular choice for insulators in electrical systems and devices.
  2. Connectors and Housings: Delrin's chemical resistance and mechanical strength make it suitable for connectors and housings used in electronic devices.

Automotive Industry

Automotive Industry - Working with CNC Machining Delrin (Acetal) Material Properties and Uses-min

Delrin's properties make it an attractive material for automotive applications.

  • Fuel System Components: Delrin's chemical resistance to fuels and oils makes it suitable for use in fuel system components, such as fuel injectors and fuel pump housings.
  • Interior Components: Delrin's strength, durability, and dimensional stability make it an ideal material for various interior components, such as knobs, buttons, and trim pieces.

Tips for Successful CNC Machining of Delrin

Tool Selection

Choosing the right tools is crucial for the successful machining of Delrin.

  • Sharp Cutting Tools: Sharp cutting tools are essential for achieving smooth, clean cuts and minimizing the risk of material melting during machining.
  • Tool Material: High-quality tool materials, such as solid carbide or high-speed steel, can improve tool life and reduce wear when machining Delrin.
  • Tool Geometry: Optimized tool geometry can help reduce cutting forces, minimize heat generation, and improve surface finish.

Machine Settings

Proper machine settings are essential for efficient and effective CNC machined Delrin.

  • Optimizing Speeds and Feeds: Adjust cutting speeds and feed rates to minimize heat generation and tool wear while maintaining part accuracy and surface finish.
  • Rigid Workholding: A rigid work holding setup is crucial for maintaining part accuracy and reducing vibrations during machining.
  • Proper Coolant Selection: Although Delrin can often be machined dry, in some cases, the use of a suitable coolant may be beneficial to minimize heat buildup and ensure a smooth machining process.

Post-Processing Techniques

Post-Processing Techniques - Working with CNC Machining Delrin (Acetal) Material Properties and Uses-min

Post-processing techniques can enhance the performance and appearance of CNC machined Delrin components.

  • Deburring: Remove any burrs or sharp edges from the machined parts using deburring tools, such as files or abrasive stones, to ensure a smooth and polished finish.
  • Surface Finishing: Proper surface finishing techniques, such as polishing, buffing, or painting, can enhance the appearance and performance of CNC machined Delrin parts, providing a refined and professional look.


To conclude, working with CNC machining Delrin (Acetal) offers a multitude of benefits for industries seeking a high-performance engineering plastic with exceptional material properties. Manufacturers can fine-tune their machining processes by comprehending Delrin's unique characteristics and the wide array of potential uses to achieve optimal efficiency and outstanding results. By employing the right combination of tools, techniques, and industry expertise, CNC machining Delrin paves the way for crafting durable, high-quality components that cater to a diverse range of applications across various sectors.