Good impact resistance, high strength, stable structure, dampproof, machinability, all of these make ABS can meet the demand of various prototype. CNC machining ABS prototype needs polish and the surface treatment. Because of the different hardness of plastics, the time and difficulty of polish differ. The polish of ABS is much easier, while the polish of PC, PA66 and POM are harder.
PC has good strength and toughness, and its luminousness can be 89%. The impact resistance of PC is 250-300 times of glass, and 30 times of PMMA plate (with same ply). PC is a kind of amorphous thermoplastic resin with comprehensive performance. It has excellent electrical insulation, extensibility, dimensional stability, and chemical corrosion resistance. Because of the mechanical strength, big-sized parts are difficult to be made with 3D printing. Therefore, CNC machining PC prototype has more advantages for big-sized prototype.
CNC machining PA prototype has high mechanical strength, and it is dimensionally stable without water absorption. Besides, it has high tensile and pressure resistance. It is widely used in various apparatus, and accessories of domestic appliance. However, the water absorption of nylon PA66 is too fast, and the tensile and pressure resistance will decrease when the temperature and humidity increase.
POM has good tensible strength, mechanical properties, impact strength, abrasive resistance and lubricity. There are two colors of POM, black and white. The density of POM is 1.42, and the temperature resistance is 100℃. The insulativity of POM is excellent and immune to temperature and humidity, and the permittivity and dielectric loss change little during the wide fluctuation of temperature, humidity and frequency, therefore, it is often used for gear, accessories of automobile, instruments and jigs. The CNC cutting of POM prototype is fast, and the surface can be treated with burnish and polish. CNC machining POM prototype needs to be finished at once. It cannot work with glue.
PMMA is the best choice for transparent prototype. PC is incomparable to PMMA. There are transparent materials among PC too, but they have to be fumigated to be transparent, and the effect is not as good as the PMMA. CNC machining PMMA prototype can be totally transparent after burnishing, and the transparency can be 95%.
High precision CNC machining aluminium parts is used widely in the field of aviation, automobile, mechanical manufacturing, ship, chemical, domestic appliance and daily necessities. With the rapid development of science and technology and industrial production, the demand of high precision CNC machining aluminium parts is increasing day by day. AL6061 is common type of aluminium, and it is often used for the parts of automobile, the frame of bicycle, sports equipment and frame of toy car. Similar with other aluminium alloy, AL6061 has good strength-weight ratio and atmospheric corrosion resistance.