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