Plastic gears and metal gears differ due to different processing methods. Cutting or grinding of metal gears is turning, and therefore has a high concentricity, diameter accuracy is easy to guarantee, without regard to shrinkage in the manufacturing sector. Plastic gear forming, concentricity is difficult to guarantee, but the configuration file is more accurate than the metal gear, because the cutting gear mold cavity cold rolling precision machining of high precision gear mold cavity electrode plastic gear strength higher than metal gear, but lack of metal Gear lubrication, light weight, low noise. Engineering plastics in mold cavity large and continuous and repeatable shrinkage should be considered with the forming of gears and compensation. Under normal circumstances, the plastic gear diameter tolerance is greater than the metal gear.

Plastic gear tolerances and gear ratios are calculated based on the development of metal gear structures, but these plastic gears are unreasonable because it does not accurately predict the function and life of plastic gears, even according to the plastic properties of the resin provided by the dealer Accurate plastic gears enter or exit the actual parameters of the engaging material at high rotational speeds.