What is a small module gear? Modulus of less than 1mm gear, commonly referred to as small modulus gear. In aviation machinery, electronic products, precision machinery, instruments and timing mechanism, widely used in small modulus gear. Small module gear processing method, the basic principle and large, the same processing principle in modulus gear.

　　"Modulus" refers to the adjacent teeth tooth profile between two teeth on the same side of the pitch t and pi π ratio (m = t / π), in millimeters. Modulus is a basic parameter modular system tooth. The larger the modulus, the higher the gear teeth are thicker, if a certain number of teeth of the gear, the radial dimension of the wheel is greater. Modulo series of standards is based on the design, manufacture and inspection requirements established.
　　For gear has a non-straight teeth, modulus have normal module mn, and the axial end surface modulus modulus mx ms difference, they are in their respective pitch (normal pitch, pitch and axial end surface pitch) ratio of pi, also in millimeters. For bevel gears, there are big-endian modulus modulus me, the average modulus mm and the small end of the modulus m1 points. For the tool, with a corresponding tool modulus mo like.
　　Application of the standard module is very wide. In metric gears, worm drive, synchronous transmission and ratchet gear couplings, spline and other parts, the standard modulus is a basic parameter toothed belt. It said parts of the design, manufacture, maintenance and so plays a role in the basic parameters (see cylindrical gear, worm drive, etc.).