How to drill holes on a steel tube with an electric drill without slipping?
Or do a sleeve type tooling (half shape, half and half clamping), the inner diameter of the sleeve is slightly larger than the outer diameter of the pipe. The tooling can be used to drill holes on the machine tool, which is slightly larger than the drill bit
1., the steel pipe to be fixed;2. line before drilling, then drill with small size drill;3. punch.
