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The Yama Seiki GV-1 series vertical turning centers offer heavy-duty cutting capabilities to complete turning, milling, contour milling and drilling applications on one machine. The series includes the GV-1200 model, which offers a maximum turning diameter of 1,350 mm and maximum weight load of 5,000 kg, and the GV-1600, which has a maximum turning diameter of 1,800 mm and maximum weight load of 8,000 kg. Both models are well-suited for machining large-diameter, heavy and asymmetrical workpieces.

The GV-1 series feature a heavily ribbed and thermally balanced bed and column cast of Meehanite for high rigidity. According to the company, the series can withstand greater stress without deforming and maximizes vibration damping. The contact surfaces of all slides, spindles and ballscrew bearing housings with the machine bed are hand-scraped for improved assembly precision, structural rigidity and load distribution.

The moving cross rail structure features a reduction drive mechanism driven by a servomotor. When the cross rail moves to the position, two sets of live locking bolts engage with the column and cross rail, followed by four sets of hydraulic cylinders which automatically lock to ensure rigidity. According to Yama Seiki, the box-shaped cross rail structure resists thermal displacement and ensures stability. The cross rail can be moved up and down, supported by the column’s high-low boxway design. 

The W-axis travel ranges to 800 mm for greater flexibility. The ram feed is balanced with two sets of hydraulic cylinder weights to minimize the workload of the servomotor and extend the life of the ballscrews and bearings. The square ram on the tooling spindle features a closed-type design and is fixed with four sets of wedges, further increasing structural rigidity and machining accuracy, the company says.