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The surface quality achievable for POM/Delrin when using standard CNC machines can be quite high, depending on the specific machining processes and finishing techniques applied. The standard as-machined surface roughness is typically around 3.2 µm (125 µin), but with additional finishing passes, this roughness can be reduced to 1.6 µm, 0.8 µm, or even 0.4 µm (63, 32, or 16 µin), although this would increase production costs due to extra machining steps and tighter quality control requirements.   For POM/Delrin parts, post-machining operations such as deburring can be employed to remove attached chips, burrs, and tool marks, improving the surface finish. Bead blasting is another option that can provide a uniform finish by blasting the parts with abrasive media like sand or glass beads. Other finishing options include metallic coatings, painting, hot stamping, and laser marking, which can be selected based on the intended use and desired aesthetic of the final product.   These surface finish operations are crucial for achieving the best surface quality, as they can significantly improve the visual appearance and tactile feel of the CNC-machined parts. However, it is essential to note that smoothing and polishing operations can alter the dimensional tolerances of the parts due to the removal of material.

[Recip Space]

What is the best surface quality achievable for POM/Delrin material?

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[Evgeny]

It’s difficult to specify a single “best” surface quality, as this can depend on the specific requirements of the application. Generally, CNC machining can achieve surface finishes ranging from Ra 0.4 to Ra 3.2 micrometers for POM, but actual results can depend on a number of factors such as design.

• This reply was modified 1 year, 7 months ago by
  E
  Evgeny.

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[Recip Space]

The surface quality achievable for POM/Delrin when using standard CNC machines can be quite high, depending on the specific machining processes and finishing techniques applied. The standard as-machined surface roughness is typically around 3.2 µm (125 µin), but with additional finishing passes, this roughness can be reduced to 1.6 µm, 0.8 µm, or even 0.4 µm (63, 32, or 16 µin), although this would increase production costs due to extra machining steps and tighter quality control requirements.

 

For POM/Delrin parts, post-machining operations such as deburring can be employed to remove attached chips, burrs, and tool marks, improving the surface finish. Bead blasting is another option that can provide a uniform finish by blasting the parts with abrasive media like sand or glass beads. Other finishing options include metallic coatings, painting, hot stamping, and laser marking, which can be selected based on the intended use and desired aesthetic of the final product.

 

These surface finish operations are crucial for achieving the best surface quality, as they can significantly improve the visual appearance and tactile feel of the CNC-machined parts. However, it is essential to note that smoothing and polishing operations can alter the dimensional tolerances of the parts due to the removal of material.

2

[Evgeny]

yes, indeed – thanks for sharing!

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