Product instruction 

It is the cover of electric device that test the indoor environment like humidity , temperature ,air quality and so on ,the diameter precision is 0.1mm as the assembly requirement .

The difficulty of spinning 

We should make sure the precision of diameter by sheer spinning to overcome the material rebound . we also need to make smooth surface of tiny and uniform spinning line to reduce the polishing cost .

solution 

We use the spinning roller of big filled radius to make the surface smoothly ,sheer spinning can make sure precision .