Marine Lug Root Cleaning Machine

Marine Lug Root Cleaning Machine

Specifications & Features:

Machine composition: The equipment consists of a machine base, X‑axis movement device, Y‑axis movement device, Z‑axis movement device, cutting unit, base lifting device, electromagnetic adhesion device, and control system.

Drive method: Motor + gearbox + ball screw.

Travel range:

X‑axis travel: 800 mm

Y‑axis travel: 500 mm

Z‑axis travel: 100 mm

High-precision linear guide rails ensure high accuracy and stability during movement.

Machine travel / mobility: Driven wheels (motor + gearbox).

Steering control: The operator uses a control switch and manually adjusts and moves the wheel direction via a hand grip.

Root cleaning of lugs – fast, efficient, and without damaging the ship plate.

Root cleaning (back gouging) of lifting lugs on ship hulls and marine structures

Removal of weld reinforcement or unwanted material from lug roots without damaging the base plate

Suitable for shipbuilding, offshore platforms, heavy steel fabrication

Ideal for on‑site repair, maintenance, and new construction where precision and speed are required

• Travel range: ensure X‑axis (800mm typical) and Y‑axis (500mm) cover your lug positions
• Z‑axis stroke (100mm) sufficient for depth control
• Drive system: motor + gearbox + ball screw for smooth, precise movement
• Magnetic adhesion: ensures stable attachment to steel surfaces
• Mobility: driven wheels with manual steering for easy positioning on the deck or hull
• Accuracy: high‑precision linear guide rails for minimal vibration and clean root removal

• Daily: clean chips and debris from guide rails, magnetic base, and cutting area
• Check all axes for smooth movement; lubricate ball screws and guide rails weekly
• Inspect driving wheels and steering mechanism for wear
• Verify electromagnetic adhesion function – clean the surface contact area
• Monthly: calibrate axis travel accuracy and spindle runout
• Store in a dry place when not in use; protect electrical components from moisture

• Core technology with original innovation, multiple national invention patents
• Provided key beveling equipment for the Hong Kong–Zhuhai–Macao Bridge
• Product range includes marine lug root cleaning machines, CNC beveling machines, cold cutting machines, chamfering machines, portable drilling & tapping machines, flange drilling machines, etc.
• Serving shipbuilding, offshore engineering, bridges, rail transportation, and heavy industry

1. What exactly is "root cleaning" for lugs?
Root cleaning (or back gouging) removes the weld root or excess material from the underside of a lifting lug after welding, ensuring a smooth, stress‑free surface that does not interfere with the base plate. This prevents crack initiation and improves safety.

2. Does the machine damage the ship plate?
No. The machine is designed with precise depth control (Z‑axis) and high‑quality linear guides. It removes only the targeted material from the lug root and stops before contacting the base plate, leaving the ship's hull completely undamaged.

3. How is the machine positioned on the ship?
The machine uses driven wheels (motor + gearbox) and a manual steering handle. The operator guides it into position, then activates the electromagnetic adhesion to lock it firmly onto the steel surface before cutting.

4. What cutting tool does it use?
Typically, a milling cutter or grinding wheel is used. The machine can be equipped with carbide end mills or abrasive wheels depending on the lug material (mild steel, high‑strength steel).

5. Is the cutting process efficient for large lugs?
Yes. With motor‑driven axes and up to 800 mm X‑axis travel, the machine handles long weld seams quickly. Typical root removal speed is 10–30 mm per second, depending on depth and material.

6. What accuracy can be expected?
Thanks to high‑precision linear guide rails and ball screw drives, positioning accuracy is within ±0.05 mm per axis. This ensures consistent root depth along the entire lug length.

7. How do I maintain the Z‑axis for depth control?
Regularly check the Z‑axis ball screw for backlash. Clean the spindle taper and collet. If using a grinding wheel, monitor wheel wear and adjust depth compensation accordingly. Calibrate depth against a reference block weekly.

8. Can the machine work on curved surfaces (e.g., ship bow)?
The magnetic base is designed for flat or slightly curved steel plates. For strongly curved surfaces, optional shims or a special magnetic pad can be provided. Please contact us for specific hull shapes.

9. What safety features are included?

Emergency stop button on the control panel

Magnetic interlock: cutting stops if magnetic adhesion is lost

Protective cover over the cutting area

Overload protection for all motors

Hand grips and wheel brakes for safe positioning

10. Is operator training required?
Basic training (half a day) is recommended. The machine uses a simple pendant or button‑based control; no complex CNC programming is needed for standard root cleaning. We provide an operation manual and video guide.

11. How long does it take to set up the machine for a new lug?
Once positioned and magnetically locked, setup takes less than two minutes. The operator sets the X/Y start point, adjusts Z depth, and runs the cut. For multiple identical lugs, repeat positioning is fast thanks to the wheeled mobility.

12. What is the typical power requirement?
The machine runs on standard three‑phase 380V or 220V (depending on the motor configuration). Power consumption is moderate – suitable for shipyard power supplies or a portable generator.

13. What warranty and support do you offer?
We provide a 12‑month warranty on all mechanical and electrical parts, excluding consumables (cutters, wheels). Lifetime technical support and spare parts availability are included.

14. Can this machine be used for other applications besides marine lugs?
Yes. It can also be used for root cleaning of heavy steel brackets, crane rail anchor bars, and any similar welded attachments where precise back gouging is required on large, fixed workpieces.

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