The performance of spur gears composed of photosetting resin composites (PRCs) containing various fillers was investigated experimentally. The materials used in the experiment were acrylic resin (PSA) and epoxy resin (PSEP), cured by irradiation with a helium-cadmium (He-Cd) ultraviolet laser (UVL) at a wavelength of 325 nm. The spur gears were molded by stereolithography using a UVL. The optimum time for the post cure in stereo lithography molding was about 20 minutes. The dedendum bending strength of spur gears made from PSA composites containing 1 wt% organic-modified montmorillonite (OMMT) increased by about 20% compared to neat PSA. The kinetics durability of the PRC spur gears was also found to increase due to the reinforcing effect of the filler. The tensile strength and flexural strength of the PSA/OMMT composite were about 1.2 times those of neat PSA. On the other hand, the flexural strength and modulus of neat PSEP were about 2 times greater than that of neat PSA itself. Moreover, the kinetics durability of neat PSEP also shows high values. From these results, it was concluded that the addition of filler has a significant influence on the characteristics and mechanical properties of spur gears made from photosetting resins.

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