Okuma VTR-160A

The Okuma VTR-160A is a vertical turning machine for work up to 1,600 mm (62.99 in) in diameter, with a 1,250 mm (49.21 in) table that carries 10,000 kg (22,000 lbs). The table is the spindle here. It turns at 1–400 rpm while the tools ride on a ram hung from an elevating rail, so the figures that matter are swing, weight and torque instead of X and Y travel.

Okuma lists two drives. The standard one is 45/37 kW (60/50 hp) with 17.1/14 kNm (12,612/10,326 lb-ft) of torque. The option is 75/60 kW with 28.5/22.8 kNm (21,020/16,816 lb-ft), and no horsepower figure is given for it. On large rings and housings the cut happens far from the centre and at low table speed, which is where torque decides how deep a pass can go. A shop roughing forgings or hard-skinned castings should price the larger drive.

Vertical reach comes from two axes stacked together. The ram (Z) travels 900 mm (35.43 in), or 1,250 mm (49.21 in) as an option. The elevating rail (W) moves 600 mm (23.62 in), or 800 mm (31.49 in) as an option. Raising the rail clears tall parts, and lowering it lets the ram work on short ones without hanging far out of its housing. Maximum workpiece height is 1,250 mm (49.2 in), the same number as the optional ram stroke, so boring to the bottom of a part that tall points to the longer ram.

The table also works as a C-axis with a minimum control angle of 0.001°, and the magazine holds 23 tools. Okuma's page gives no speed or power for a rotating tool, so ask what the C-axis is paired with before counting on drilling or milling in the same setup.