Question 1

Is PEEK difficult to machine?

Accepted Answer

PEEK can be challenging to machine due to its high melting point (343°C) and tendency to crack during stress relief. However, with proper techniques, specialized tooling, and experienced operators, PEEK can be machined successfully. Key considerations include using diamond-coated or silicon carbide tools, controlling cutting temperatures, and implementing proper stress relief procedures. The material's excellent dimensional stability and chemical resistance make it worth the machining challenges for demanding applications.

Question 2

Can you machine PEEK plastic?

Accepted Answer

Yes, PEEK plastic can be successfully machined using CNC equipment with the right approach. The process requires specialized cutting tools (preferably diamond-coated or silicon carbide), optimized cutting parameters, and proper cooling methods. PEEK machining typically involves lower cutting speeds and feeds compared to other plastics, with careful attention to temperature control to prevent material degradation. The result is high-precision parts with excellent surface finish and dimensional accuracy.

Question 3

Is PEEK better than Delrin for machining?

Accepted Answer

PEEK and Delrin (POM) have different advantages for machining. PEEK offers superior mechanical properties, higher temperature resistance (up to 260°C vs 100°C for Delrin), and better chemical resistance, making it ideal for demanding applications. However, Delrin is generally easier to machine with better dimensional stability and lower cost. PEEK is preferred when high performance is required, while Delrin is better for cost-sensitive applications where standard performance is sufficient.

Question 4

How do you cut PEEK plastic?

Accepted Answer

Cutting PEEK plastic requires specialized techniques and tools. Use diamond-coated or silicon carbide cutting tools for best results. Maintain cutting speeds between 200-400 m/min and feed rates of 0.1-0.3 mm/rev. Implement proper cooling to prevent thermal damage, and use sharp tools to minimize tool wear. For complex geometries, consider 5-axis machining capabilities. Always perform stress relief annealing before machining to prevent cracking, and maintain consistent cutting parameters throughout the process.

Question 5

Can PEEK be laser cut?

Accepted Answer

Yes, PEEK can be laser cut, but it requires specific considerations. CO2 lasers are typically used with power settings between 20-100 watts depending on material thickness. The process produces clean cuts with minimal heat-affected zones. However, laser cutting PEEK may cause some thermal degradation at the cut edges, so post-processing may be required for critical applications. Laser cutting is ideal for thin sheets and complex 2D geometries, while CNC machining is preferred for 3D parts requiring tight tolerances.

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Frequently Asked Questions

Is PEEK difficult to machine?

Can you machine PEEK plastic?

Is PEEK better than Delrin for machining?

How do you cut PEEK plastic?

Can PEEK be laser cut?

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