Campro NT-208Y

For shafts and chucked parts that need off-centre milling but not a second spindle, Campro builds the NT-208Y. It is an 8 in chuck box-way lathe with a Y axis of 100 (±50) mm, a 12-station BMT-55 live turret, a C axis and a tailstock.

The tailstock is what distinguishes it from the NT-208SY. Its quill is Ø80 mm (Ø3.1 in) with 120 mm (4.7 in) of travel and an MT-#4 taper, so a shaft can be supported while keyways, flats and cross holes are machined along its length. On a sub-spindle machine that support is not available.

Compared with the NT-208M, the gain is the Y axis itself. The NT-208M can only place a rotating tool on the spindle centreline and rely on the C axis. Here the tool can move across the part, which Campro describes as a real Y-axis allowing servo compensation. The cost is some turning envelope and speed: maximum turning diameter is Ø400 mm (Ø15.7 in) and turning length 520 mm (20.4 in), and X and Y rapid at 20 m/min and 10 m/min, with Z at 24 m/min.

The main spindle is the NT-208 standard: A2-6, 11 / 15 kW (20 HP), 4,200 rpm, with a Ø52 mm hole through the draw tube. Driven tools run to 5,000 rpm on a 2.2 / 3.7 kW turret servo motor, and tooling is □25 / Ø40 mm.

The Y-axis slide makes the machine tall. It measures 4,254 x 2,141 x 2,381 mm (W x D x H), weighs 4,700 kg (10,361 lb) and needs 30 kVA. The bed is the one-piece 30° slant casting with box ways that Campro uses across the M and Y models.