Danobat Mikroturn Vertical 1500V4

The Danobat Mikroturn Vertical 1500V4 is the largest hard turning lathe Danobat lists, with a maximum turning diameter of 1,500 mm (59 in). The page's headline for the vertical family, large workpieces up to 1500 mm in diameter and 2000 kg in weight, takes its diameter from this model. Turning height is 350 mm (13.8 in), the same as on every Mikroturn Vertical.

Those proportions describe the work: big, flat rings. Large bearing races are the obvious candidates, and bearings are one of the two sectors Danobat names for the machine. A part 1,500 mm (59 in) across and at most 350 mm (13.8 in) tall would be awkward on a horizontal spindle and sits naturally on a vertical table with a magnetic chuck.

Being a V4, it turns OD and ID at the same time, which Danobat credits with cycle time savings of up to 40%. On rings this size a single finishing pass is long, so the saving is measured in real minutes per part. Spindle speed is 200 rpm.

Holding microns over a metre and a half is a thermal problem before it is a mechanical one. Danobat's answers are a natural granite base and spindle housing, heat sources and vibrating elements placed outside the machining area, and hydrostatic bearings throughout: ≤ 0.1 µm guaranteed run-out error on the main spindle, 1 µm positioning and 0.2 µm repeatability on the guideways. Quoted workpiece results for the family are ≤ 2 µm dimensional tolerance and ≤ 0.5 µm roundness. Floor space is 37 m² (398 sqft).