Available from Yama Seiki is the GV-1 vertical turning series, which features two different models with live turrets: the GV-1200M and GV-1600M. The machines’ Meehanite-casting columns are ribbed and thermally balanced to withstand stress without deforming. Their turning diameter ranges are 1,350 mm and 1,800 mm, respectively, with a maximum weight load of 5,000 kg and 8,000 kg. The machines use live-tooling spindles and CF-axis capabilities to complete turning, milling, contour milling and drilling operations on one machine.
The contact surfaces of all slides, spindles and ballscrew bearing housings are hand-scraped to increase precision, structural rigidity and load distribution. The crossrail is mounted with four sets of up/down-positioning mechanisms to provide strong locking/positioning at each point, ehich strengthens the overall rigidity of the crossrail and tooling spindle, the company says. The crossrail is designed with a box-shaped structure to prevent thermal displacement and ensure machine stability during turning operations. W-axis travel ranges to 800 mm to increase machine flexibility. Pre-tensioned ballscrews with ground box ways also increase rigidity for heavy-duty cutting.
Instead of using partial belts, the series uses gears to connect the spindle motor and work table. According to the company, when combined using a high-torque two-speed gearbox with a 40/6000i series spindle motor, the machine increases output for heavy-duty cutting.
The optional CF-axis and disc brake system uses a worm-gear drive system for transmission and easy backlash adjustment, the company says. The indexing accuracy reaches approximately 0.001 degree. Working with the live-tooling turret, the CF-axis and disk brake system enables the machine to perform multiple tasks, such as drilling, tapping, and milling operations (including cylindrical and polar coordinate interpolations).
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