[Industrial Knowledge] How to Improve CNC Machining Surface Finish On Your Precision Parts? How to Improve CNC Machining Surface Finish On Your Precision Parts? For most case, surface quality is very important for mechanical components. For most mechanical processing plants, the use of the correct machining process has a great help in improving the surface quality of CNC machining. Here are our 5 ways that you can address on the machine to make poor surface finish go away: