Precision instruments mostly use helical gears for the following reasons:

• Helical gear transmission is smooth. The tooth surface of the helical gear is beveled, which can make the gear drive smoothly and reduce operating vibration and noise.
• Helical gears have high transmission efficiency. Helical gears have a large number of gear teeth, large tooth surface contact, high transmission efficiency, and can better transmit power.
• Helical gears have high precision. The tooth surfaces of helical gears are beveled and form a certain angle with the horizontal direction, which can make the gear meshing more closely and achieve higher precision.
• Helical gears have a wide range of applications. The number of teeth and gear diameter of helical gears can be designed according to needs. They have a wide range of applications and can meet different transmission needs.

Our company was formerly known as Changsha Double Star Gear Industrial Co., Ltd, which was established in 1994. It is a directly affiliated university-run enterprise founded by Central South University Professor Zeng Tao, the leading expert on spiral bevel gears in China. It was later renamed as Changsha Senjie Gear Co., Ltd (abbreviated as "CSG") in 2016. CSG is a production R&D base specializing in professional design, reserch, manufacture and sales of high-quality small module spiral bevel gears and high reduction hypoid gears and cylindrical gears. In 2023, Hunan Dinghan New Material Technology Co., Ltd. was established as a specialized international export business department. CSG has strong scientific research and development capabilities and is also equipped a full set of advanced equipment including seven-axis five-linkage CNC spiral bevel gear grinding machines and gear milling machines. By making the best use of the scientific and technological achievements and equipment of the Gear Research Institute of Central South University, machanical processing, heat treatment and testing. We have developed high-quality products featuring high reduction, high speed, heavy load, low noise and less teeth for users.

With the quality policy of "scientific and technological innovation, quality first, being first-class firm and customer‘s satisfaction", we have won the trust of well-known domestic and abroad enterprises with stable and excellent quality. It is committed to be a pioneer of the industry of China's small-module spiral bevel gears, and is dedicated to providing service for any related industry requiring industrial robots, CNC turning and milling compound power tool turrets, industrial sewing machines, reducers, bicycles, power tools and aeromodelling. We sincerely look forward to your cooperation!