Machining of Two Crusher Shafts

As part of a refurbishment operation, two 900 mm-long transmission shafts underwent precision machining, with a clear objective: to correct out-of-roundness and improve surface finish in order to meet regulatory compliance requirements.

The operation began with controlled grinding of the shaft surfaces, originally at a diameter of Ø419 mm, to achieve a final diameter of Ø416 mm. This process ensured a compliant surface, ready for subsequent babbitt (white metal) lining in accordance with the manufacturer’s specified tolerances.

Following the machining operations, a comprehensive dimensional inspection was carried out using a laser tracker, enabling precise verification of geometries and the adjustment of rings on one of the shafts. A detailed inspection report was prepared to provide the necessary data for the continuation of the babbitt fitting process.

This service highlights the importance of a rigorous sequence of machining and metrology operations, ensuring the functional quality of critical mechanical components before their return to service.

June 2024

ORBITAL GRINDING

Machining of rudder stock bearing surface

Rotor shaft machining

Machining of two crusher shafts

On-site re-machining on crusher assembly

Turbine shaft repair

Turbine shaft machining 𝘊𝘈𝘚𝘛𝘌𝘛𝘈𝘙𝘉𝘌

orbital machining

On-site corrective machining of drum shaft

On-site orbital machining of two shaft axes

Alignment Check of the Shaft Line

A metrological inspection was carried out on the shaft line of the sailing yacht S/Y Naema, following the replacement of the thrust bearing silent blocks. Conducted at the Monaco Marine site, the purpose of the intervention was to verify the mechanical alignment between the drivetrain components as part of a post-maintenance adjustment.

Measurements were taken using a laser tracker, with a reference frame established from the entrance and exit points of the stern tube. The data were then corrected to a standard reference temperature to ensure measurement reliability.

This type of inspection ensures that alignment tolerances remain compatible with the mechanical clearances designed into the system, and that the current configuration is consistent with proper operational performance.