Barker Collins installs Doosan horizontal borers

Precision subcontractor Barker Collins Engineering has installed five Doosan DB 130C/CX horizontal boring machines, supplied by Mills CNC, to exploit the potential of renewable offshore energy. Barker Collins manufactures large, complex oil/gas, marine and other subsea components and has won a range of offshore wind-turbine manufacturing contracts. An example of the type of work undertaken in the sector is the production of clevis joints.

Manufactured from cast steel and supplied in sets (one male and one female part per set) and weighing between two and two-and-a-half tonnes each, these clevises are machined on Barker Collins' Doosan horizontal boring machines in a single setup. Manufacturing times vary but are typically around 11-13 hours per part. Prior to Barker Collins being awarded the contract to manufacture and supply 106 sets (eight sets per week), the clevises were being turned and milled. Cycle times were long and transferring the clevises between different machines created delays and affected part accuracies.

Chris Carter, managing director at Barker Collins, said: 'There's a common misconception among some that accuracies and surface finish become less important when machining large components. 'But with our Doosan boring machines and our knowledge of how to get the best and the most from them, combined with specialised tooling [such as contouring heads and boring bars for deep-hole drilling and internal profiling] and our custom-built workholding and fixtures, we're able to achieve extremely tight tolerances [0.001mm] and superior surface finishes [Ra 1.6 micron],' added Carter.

Doosan DB 130C/CX's are travelling-column machines with large X-, Y- and Z-axis travels (4,000 x 2,000 x 2,000mm), equipped with linear scales to optimise accuracy. They each have a high-torque spindle (25kW 2,500rev/min) with a three-range gearbox for heavy-duty machining and fast/high removal rates, a 130mm boring spindle, a 700mm W axis (for extra reach across the table), a continuous B-axis rotary table that can be indexed every 0.001 degrees and a fixed-address 60-position tool changer.

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