Niigata HN100D-II BAR

Niigata's HN100D-II BAR is a 1,000 mm pallet horizontal machining center with a boring-bar spindle, aimed at large parts with deep, accurate bores. The pallet is 1,000 mm × 1,000 mm, the workpiece can be φ2,300 mm × 1,850 mm, and the W-axis quill feeds out 555 mm (21.9 in) on a φ130 spindle.

Niigata's worked example is the end plate of an injection molding machine. Such plates are large, need precise tie-bar bores, and are tedious to re-fixture. With the quill, the deep holes are finished from one side in a single chucking, and the pallet changer lets the next plate be set up while the first is cut. The maker lists the two-pallet changer and a high-speed ATC under productivity for the series.

The travels are 2,030 mm (79.9 in) in X, 1,500 mm (59.1 in) in Y and 1,200 mm (47.2 in) in Z. All three linear axes rapid at 20 m/min, an even figure that sits between the smaller and larger BAR models, and W moves at 5 m/min. Standard pallet load is 3,500 kg (7,716 lb). The 5,000 kg (11,023 lb) option is restricted to the NC table, which also brings 0.001° indexing in place of 1°.

At the spindle, the machine gives 1,836 N·m (1,354 lb-ft) up to 3,500 min-1 with BT50 tools. Core cooling of the spindle is standard. Structurally Niigata stresses the square-slide column traverse design, with the column guides, ball screw and spindle centred on one line, and a double column that guides the head on both sides. Magazine capacity starts at 62 and extends to 255 tools.