1. Maintain the bits clean. Use standard cleanser that is special for bits to clean the filth and impurity.
2. Smear amount of machine oil on bits surface to avoid rusting and damage.
3. In order to meet the demand of operation, milling process needs the particular equipments and skills. Forbid milling bits or changing the shapes of bits at random, or that will cause the bit edge broken even facilities accident.
4. Blow to clean the ash and other dirt off the bearing. Forbid cleaning it with diesel oil or coal oil, or that will damage the special lipid.