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CNC Machining in Nylon 66

Nylon 66 is a widely-used engineering plastic with good toughness, abrasion resistance, and hardness characteristics. These properties make it ideal for load-bearing mechanical components and as such, it is often a good substitute for metals. CNC machining in nylon 66 results in inexpensive, high-performance parts.

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About Nylon for CNC Machining

Nylon, generically polyamide, is a thermoplastic synthetic polymer. As a thermoplastic, it can be molded into various shapes via thermoforming. While nylon can be formed into fibers for rope and fabric, extruded, and injection molded, it has advantages when manufactured via CNC machining. Nylon has excellent thermal, mechanical, and chemical resistance properties when cut from solid stock.

Nylon 66 At a Glance

Application

Nylon 66 is used for structural components like gears, wheels, and consumer electronics casings.

Advantages

Abrasion resistance, moderately high-temperature resistance, high fatigue resistance

Disadvantages

High moisture absorption that causes swelling

Lead Time

Lead time is generally a minimum of 3 days. However, this can increase depending on availability or if the parts are to be internationally manufactured.

Price

$

Tolerances

Machining tolerances of 0.010” (0.25 mm) are achievable.

Wall Thickness

A minimum wall thickness of 0.03” (0.8 mm) is achievable. This can vary depending on the ratio of wall thickness to planar dimension.

Max Part Size

The maximum size of the part is determined by the machines available and the complexity of the part.

Nylon 66

Nylon 66, also written as nylon 6-6, nylon 6,6, or nylon 6/6, is a more crystalline version of nylon 6. It is also referred to as polyamide 66 or PA 66. It has improved mechanical properties due to its more ordered molecular structure. Nylon 66 for machining has improved temperature resistance and lower rates of water absorption when compared to standard nylon 6. Typical applications include wear pads, guide wheels, and slide bearings.

General Nylon 66 Properties
Tensile Strength, Yield (MPa)Elongation at Break (%)Hardness (Shore D)Heat Deflection Temperature (°C)Melting Point (°C)
Tensile Strength, Yield (MPa)

30-98

Elongation at Break (%)

1-300

Hardness (Shore D)

78-88

Heat Deflection Temperature (°C)

75-428

Melting Point (°C)

197-266

Finishes

As is the case with most plastics, the surface-finishing options are limited. This is especially the case with nylon which cannot be easily plated. Furthermore, sanding produces a frayed surface that often looks worse than the machined surface. Some possible finishes are listed below:

As machined: CNC machining in nylon 66 will often leave an excellent surface finish. Xometry machinists achieve this with sharp HSS (high-speed steel) cutting tools with appropriate high rake and relief angles.

Bead Blast: Nylon 66 can be further smoothed with bead blasting operations to achieve a lower surface roughness.

Dying: Nylon readily absorbs liquid, so dyeing is a common finishing option. Solvent dyes are used to dye the surface of the white nylon parts in various colors.

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    Cost-saving Design Tips

    Nylon 66 is a relatively inexpensive engineering plastic, however, to further save on machining costs, try the following:

    Keep parts simple: to minimize machining set-ups and reduce the cost of the machine required (in other words, using a 3-axis machine versus a 4-axis or 5-axis machine), keep the geometry as simple as possible. A part with complex geometry may be a better candidate for 3D printing in Nylon 12 via SLS (selective laser sintering) or HP Multi Jet Fusion.

    Keep parts consistent: keep internal corner radii and tapped holes to consistent measurements to reduce the number of tool changes required by a manufacturer

      CNC machining design tip
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