Latest Doosan Mynx VMCs measure up to heavy duty machining applications

This six-machine Doosan vertical machining centre range encompasses three sizes each in BT 40 or BT 50 variants. The Mynx 5400/40 and Mynx 5400/50 have X, Y and Z travels of 1,020 by 540 by 530 mm, and have a 1,200 by 540 mm table that can handle up to 800 kg. The Mynx 6500/40 and 6500/50 are the mid-range machines and have X, Y and Z travels of 1,270 by 670 by 625 mm, and a 1,400 by 670 mm table that can take loads up to 1,000 kg. The largest vertical machining centres are the Mynx 7500/40 and Mynx 7500/50 which provide users with 1,525 by 762 by 625 mm in X, Y and Z, and can accommodate 1,500 kg on their 1,600 by 750 mm tables. Doosan Mynx vertical machining centres all have an ultra-rigid, arch-shaped body in common which helps to optimise their static and dynamic stiffness characteristics. They also feature wide box guideways (induction-hardened and precision ground) for long term rigidity and accuracy. The sliding surface of the guideways is bonded with Rulon 142 (a fluoro-plastic resin that reduces friction) and is then hand scraped to achieve a perfect fit. Rigidity and machining accuracy are assisted by machine tables fully supported by the saddle in all positions with no overhang. Mynx vertical machining centres, depending on the specific model, are equipped with powerful belt or gear-driven spindles that accept either BT 40 or BT 50 Big Plus – Dual Contact face and taper tooling. Belt-driven models have spindles that are supported on both sides by four permanently greased and lubricated, high speed bearings. Spindles are driven by up to 22 kW motors at speeds ranging from 6,000 to 12,000 rpm and delivering up to 365.5 Nm of torque. The 6,000 rpm spindles offer optimum stiffness by using steel bearings. All three models can be equipped with gearbox drive to the spindle. Mynx machines can mitigate the effects of thermal expansion and deformation in a number of ways. These include: • directing heated air from the machine's spindle housing casting and replacing it with cooler air (estimated reduction in thermal growth on the Z-axis 30% compared to earlier Mynx machines); • an oil cooler that maintains the temperature of the oil as it circulates around the spindle and bearings; • high static and dynamic stiffness values achieved in the main castings that reduces deformation of the machine structure; • optical linear scales on X, Y and Z axes to ensure high (life-long) positioning accuracy (option); and • a coolant chiller that cools the workpiece and cutting tools during machining operations (option). These Mynx vertical machining centres have an increased Y-axis capacity which means that wider workpieces can be accommodated and machined. They also have faster rapid traverse rates on all three axes (30 m/min on X and Y axes and 24 m/min on the Z-axis). They also boast an improved automatic tool changer that provides increased tool storage capacity and faster tool-to-tool change times. Standard tool storage capacity for all machines is 24/30 tools, but this can be increased to 40 tools as an option. And, depending on the specific Mynx machine in question – tool length and tool weight capacities have also been increased.