Large-scale components such as propeller shafts, piston rods, and rudder stocks, which are the main arteries of a ship’s propulsion and steering systems, form the basis of the vessel’s operational integrity. Bending, wear, or surface damage that occurs on these massive and high-cost parts over time can cause the vessel to be out of service for weeks. As İntermak, with our high-capacity lathe capable of machining parts up to 1600 mm in diameter and 5 meters in length, and our expert operators, we provide significant savings in both time and cost by reconditioning these critical components.

• Assessment and Disassembly: The process begins when the shaft, piston rod, or spindle to be repaired arrives at our workshop. The part is first checked for surface cracks using NDT (Non-Destructive Testing) procedures. It is then placed on special supports, and a run-out check is performed using dial indicators or laser systems to precisely measure the amount of existing bending or deformation. If there are other removable parts on it (sleeves, couplings, etc.), they are carefully disassembled without damaging the main body.
• Analysis and Component Inspection: The measurement and NDT results are analyzed by our engineers by comparing them with the part’s original technical drawings and tolerances. This analysis determines the part’s recoverability, how much material needs to be removed, and the most appropriate turning or grinding strategy to be applied. The target final dimensions and surface quality for critical areas, such as bearing and seal running surfaces, are planned at this stage.
• Repair and Assembly: Following the analysis, the part is mounted with high precision into our high-capacity lathe’s chuck or between centers, and its run-out is trued. The turning process is started by our skilled operators according to the defined repair procedure. This process may include cleaning up worn bearing surfaces, straightening bent shafts, re-machining damaged areas after weld build-up, or bringing the part to the required final diameter. After turning, the seal and bearing surfaces are brought to the desired surface roughness (Ra) value using special grinding and polishing attachments.