Deep-hole drilling requires more than simply increasing drill length. Hole depth, drill diameter, tool guidance,
chip evacuation, coolant delivery, spindle arrangement and workpiece stability all influence the process.
Octagon Manufacturing Technology develops drilling-machine concepts for applications requiring extended
drilling depths, including application-specific deep-hole drilling arrangements.
For deep holes, the spindle and tool-holder arrangement must provide adequate rigidity and runout control.
The machine structure and workholding must also maintain alignment throughout the drilling operation.
Important Design Considerations
A deep-hole drilling solution should consider:
- Hole diameter and depth
- Depth-to-diameter ratio
- Drill type and tooling
- Required spindle speed
- Feed rate
- Coolant delivery
- Chip evacuation
- Workpiece material
- Component orientation
- Tool support and guidance
- Required hole straightness and accuracy
- Peck Drilling
For suitable applications, controlled peck drilling can be used to periodically retract the tool for chip
evacuation and process control. The exact peck sequence should be established from the drill
manufacturer's recommendations and the component material.
Machine Design
Octagon can integrate servo positioning, spindle control, PLC sequencing, coolant and pneumatic systems
into a dedicated drilling machine.
For a new deep-hole application, the final spindle, tooling and coolant configuration should be validated
against the actual drill diameter, material and required depth before production release.
