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T-shaped double gear is a type of double gear structure with an axial cross-section in the shape of a T and formed as a whole. Two gears are coaxial, with the same core and different diameters (or tooth shapes), commonly used for compact deceleration/reversing/shifting, and are very common in semi-automatic capping machines.

PM = Powder Metallurgy， Powder metallurgy, PM double gear=powder metallurgy double gear/double-layer gear, is a gear that is integrally formed, coaxial with two different tooth numbers/moduli, and is made by pressing and sintering metal powder. It belongs to precision transmission parts.

The core advantages of powder metallurgy gears are near net forming, material saving, labor saving, low cost, and suitability for large quantities.

Mechanical method: including solid crushing and liquid crushing. Solid crushing is the process of rolling or vibrating a cylinder to impact and crush materials into powder using steel balls, suitable for brittle metals and alloys; Liquid pulverization is mainly the atomization method, which disperses molten metal into mist like droplets through high-pressure gas, liquid, or high-speed rotating blades. After cooling, it becomes powder and is suitable for metals with low melting points