A new type internal diameter grinding/polishing machine has been sucessfully developed in the year of 2019. It can grind internal diameter surface roughness to be Ra0.03um. There is no such function or accurancy machine yet in the market and it belongs to be a thoroughly new type grinding and polishing machine. 

Patents were applied and approved already for the whole machine and the grinding/polishing tools. It has been put into operation for the grinding/polishing of the internal diameter of the cylinder body of our patent air cylinder product. The machine is being optimized and will be put into the market as a standard mahine.