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.
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.
|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|
|Disdvantages||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.|
|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, 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.
|Tensile Strength, Yield (MPa)||Elongation at Break (%)||Hardness (Shore D)||Heat Deflection Temperature (°C)||Melting Point (°C)|
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:
Nylon 66 is a relatively inexpensive engineering plastic, however, to further save on machining costs, try the following: