How to Select the Right CNC Machining Material for Optimal Results
CNC machining is inarguably the lifeblood of the manufacturing industry with applications such as aerospace, medical devices, and electronics. Choosing CNC machined...
POM (Delrin)
CNC Machining Service
Opt for RapidDirect’s exceptional engineering expertise for superior POM (Delrin) CNC components. Stay ahead in your industry with innovative solutions, offering POM prototypes and production parts that meet your specifications.
POM (Delrin) in CNC Machining
POM, also known as Delrin, is a thermoplastic known for its high strength, rigidity, and excellent machinability. This material exhibits low friction and high wear resistance, making it ideal for applications requiring tight tolerances and smooth, stable performance. Machine delrin is particularly useful in the automotive, electronics, and consumer goods industries, where precision and durability are paramount. Its properties make it a top choice for producing gears, bearings, and other components that demand low wear and high strength.
| Price: | $$ | Available POM at RapidDirect: | High-quality POM material in various grades to suit diverse applications. |
|---|---|
| Lead Time: | About 6 days |
| Wall Thickness: | Minimum of 0.8 mm |
| Tolerances: | ±0.005″ (±0.125mm) |
| Max Part Size: | 1200 x 500 x 150 mm |
| Applications: | Automotive, electronics, consumer goods, and industrial machinery |
Machined POM Properties
This engineering thermoplastic is ideal for precision POM components and parts. Explore the properties of POM that make it a standout choice for CNC machining.
| Tensile Strength (MPa) | Elongation at Break (%) | Hardness (Rockwell R) | Tensile Modulus GPa | Flexural Strength (MPa) |
|---|---|---|---|---|
| 70 | 20 | M85 | 3 | 90 |
Surface Finishing Options for POM (Delrin)
RapidDirect offers a comprehensive range of surface finishing services to enhance the performance and appearance of your CNC machined POM parts. Whether you need an as-machined finish, polishing, painting, or tumbling, we have the expertise to deliver the desired results.
As Machined
This is the natural finish that results from the machining process. POM can retain its dimensional stability and mechanical properties in this state.
Sand Blasting
Sandblasting can create a matte or textured surface on POM, improving its appearance and providing a uniform finish.
Tumbling
Tumbling can smooth the surface of POM parts, removing sharp edges and creating a polished or matte finish.
Painting
POM can be painted, though it requires a proper primer to ensure adhesion due to the material's low surface energy. Painting offers a variety of color options for the finished part.
Pros and Cons of
POM (Delrin) CNC Machining
POM plastic offers a unique combination of high strength, rigidity, and low friction, which is beneficial for producing precision parts. However, it’s essential to consider both the advantages and disadvantages of using POM in CNC machining to make an informed decision.
Pros
- High Dimensional Stability: POM offers excellent dimensional stability, ensuring parts remain precise over time. This characteristic is essential for applications that require consistent performance and tight tolerances, reducing the need for frequent adjustments or replacements.
- Low Friction Coefficient: POM’s low friction coefficient makes it ideal for applications requiring smooth movement and minimal wear. This property reduces operational noise and enhances the longevity of components, making it suitable for gears, bearings, and other moving parts.
- Wear and Fatigue Resistance: High resistance to wear and fatigue extends the lifespan of components. POM parts can endure repetitive stress and harsh conditions without significant degradation, which is crucial for industrial and mechanical applications.
- Chemical Resistance: POM’s chemical resistance allows it to perform well in various environments without degradation. It can withstand exposure to solvents, oils, and fuels, making it suitable for automotive and industrial applications.
- Ease of Machining: POM’s excellent machinability reduces production time and costs. It can be easily cut, shaped, and finished to precise specifications without causing excessive wear on machining tools.
Cons
- Susceptibility to Cracking: POM can be susceptible to cracking under high stress or impact, which may limit its use in specific applications. Proper design and careful handling can mitigate this risk, but it is essential to consider when choosing materials for high-stress environments.
- Higher Cost: The material is relatively expensive compared to some other plastics, which might impact overall project costs. While its properties justify the cost in many applications, budget constraints might necessitate exploring alternative materials.
- Tool Wear: POM’s high hardness can sometimes lead to tool wear during machining, requiring specialized equipment and techniques. This can increase maintenance costs and downtime, impacting overall production efficiency.
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FAQs
POM, or polyoxymethylene, is a type of acetal. Acetal is a broad term that refers to a family of thermoplastics known for their excellent mechanical properties and machinability. POM is the most common type of acetal and is often referred to simply as acetal in many applications.
POM and Delrin refer to the same material, with Delrin being a brand name for POM produced by DuPont. While Delrin is a specific brand, other manufacturers produce POM under different names. Therefore, Delrin is a type of POM, but not all POMs are Delrin.
While Delrin is a specific type of acetal produced by DuPont, the terms are often used interchangeably in the industry. Acetal refers to the broader category of thermoplastics, while Delrin is a brand name within this category. Therefore, while all Delrin is acetal, not all acetal is Delrin.
POM can be susceptible to cracking under some conditions, particularly if exposed to high stress or impact. Processing parameters and environmental conditions can influence the likelihood of cracking. Proper design considerations and handling can minimize the risk of cracking during Delrin milling.
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