Five-Axis Vertical Deep Hole Drilling Enables Complex Angle Drilling for Marine Components

Customer Background

The customer is a manufacturer of marine propulsion systems, producing propeller components, rudder stocks, and stern tubes for commercial vessels and offshore platforms. Their components are large, heavy, and require precision-drilled holes at compound angles for lubrication passages, hydraulic lines, and mounting hardware.

The Challenge

Marine propulsion component drilling presents unique challenges:

Large, heavy workpieces. Propeller components can exceed 5 meters in length and weigh several tons. Handling and positioning these parts for multi-angle drilling is difficult and time-consuming.

Corrosion-resistant materials. Marine components are machined from duplex stainless steel, super-duplex grades, and high-strength bronze alloys. These materials are tough on tooling and require rigid construction and appropriate cutting parameters.

Compound-angle holes. Lubrication passages must be drilled at precise angles that intersect internal galleries. These are not simple perpendicular holes — they require simultaneous multi-axis positioning.

Custom fixture dependency. Previously, each angled hole required a custom angle fixture or manual setup using sine plates and protractors. A single component could require 6–8 different fixture configurations.

Multiple operation types. The same component needs deep drilled holes and milled features. On separate machines, each feature means another transfer, re-clamp, and accumulation of positioning error.

The Solution

RuidCNC provided the 5-Axis Vertical Type Deep Hole Drilling Machine:

• 5-axis cradle table (X, Y, Z, A, C) — the swivel rotary table tilts (A) and rotates (C) the workpiece to any compound angle, eliminating special angle fixtures and repeated setup
• 24-position tool magazine — drills, end mills, and other tools stored for multi-process work without manual tool changes
• Drilling and milling in a single clamping — deep holes and milled features completed in one setup, eliminating machine transfers
• Vertical spindle orientation — gravity-assisted chip evacuation; chips fall freely from deep holes
• High-pressure through-spindle coolant — reliable chip removal in deep vertical holes

Key Machine Specifications

Parameter	Specification
Axes	5 (X, Y, Z, A, C)
Worktable	Swivel rotary (cradle), A-axis tilt + C-axis rotation
Tool magazine	24 positions
Spindle speed	0 – 12,000 rpm
Max drilling depth	600 mm
Rotary axis accuracy	±0.005°
Positioning accuracy	±0.008 mm
Coolant pressure	Up to 100 bar

Results

Metric	Previous Process	5-Axis Vertical	Improvement
Setup changes per component	6–8	0 (single setup)	Eliminated
Total setup time per component	4.5 hours	25 minutes	91% reduction
Hole position accuracy	±0.05 mm	±0.015 mm	67% better
Angle accuracy	±0.2°	±0.05°	75% better
Cycle time per component (6 holes + milling)	3.2 hours	1.1 hours	66% reduction
Fixture costs (annual)	$45,000	$3,500	92% reduction
Scrap from positioning errors	3.8%	0.2%	95% reduction

Process Validation

The process was validated through:

• Hole position and angle measurement on a CMM
• Oil passage flow testing of finished components
• First-article dimensional inspection of drilled and milled features
• Repeatability study across consecutive components

Conclusion

The five-axis vertical deep hole drilling machine transformed the customer’s approach to marine component manufacturing. By eliminating custom fixtures, multiple setups, and machine transfers, the machine reduced lead times, improved accuracy, and delivered significant cost savings. The cradle table and 24-position magazine let the customer drill compound-angle holes and mill features in a single clamping — which the separate-machine process never could.

Figures are representative of typical applications.