1. Facing of end faces.
2. Drilling (drilling out and drilling from solid) – flat drilled hole end.
3. Internal longitudinal turning.
4. External longitudinal turning.
- Choose corner radii and toolholder size as large as possible.
- Drilling tolerance + 0.15 mm (for drilling processes with a driven tool).
- When drilling greater than nominal ⌀, residual material will remain.
- Always use internal cooling for drilling (at least 5 bar).