1. Drilling holes in metal materials should be first used to punch sample holes at the drilled position.
2. When drilling larger holes, small bits are used to drill in advance, and then large bits are used to drill holes.
3. When drilling on metal for a long time, some cooling measures can be taken to keep the bit sharp.
4. The cuttings produced during drilling are strictly forbidden to be cleaned by hand, and special tools are used to remove the cuttings.