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This should be fully considered when designing the pitch and center of the nylon gear. The hygroscopicity of acetal is much weaker than that of nylon, and volume expansion is less pronounced under the same environment. However, each material has its advantages, but also has its shortcomings; when the nylon absorbs moisture, the load bearing capacity is reduced and the impact strength is increased; the acetal changes little in a humid environment, but is brittle and not resistant to impact.
Gear Design The design of the plastic gear is basically the same as that of the metal gear, but the root should be a rounded corner formed by a smooth curve. Another difference between metal gears and plastic gears is the way in which the teeth enter the mesh. Under heavy load, the plastic gear bends more sharply than the metal gear, and the teeth that enter the mesh become unconcentric at the same time, and the tops are embedded with each other. The size calculation of the gear size plastic gear is basically the same as the metal gear.
Casting structure design The casting structure design of plastic gears should also be reasonable. Linearists often use linear ribs or spokes to reinforce the strength of the plastic part, but these features may result in uneven shrinkage, resulting in elliptical or non-circular gears; the solution is to use a web or rim instead of the support ribs. In order to save weight-reducing holes in the material, the parts can be shrunk, resulting in uneven bonding wires and weakening the gears. The bond line is formed when two molten plastics meet and flow together into the mold.