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Manufacturer: WMW NILES (Germany)
Model: DH 250/4 (also seen as DH 250‑4 or DH250/IV)
Purpose: Specialized relieving/hob‑relieving lathe, also suitable for back-turning and grinding
Max turning diameter over bed: 300 mm
Max turning diameter over rear slide: 250 mm
Max turning length / distance between centres: 630 mm / 1,000 mm
Centre height (bed / rear slide): 300 mm / 150 mm
Relief and cross-slide swivel range: 360° each
Turning spindle bore: Ø 27 mm
Tool quick draw-back: 40 mm
Relief turning stroke: 0–32 mm (stepless within 4 steps)
Spindle speeds: 1–400 rpm (stepless within 4 ranges)
Back‑turning rebound speed: Up to 2.5–630 rpm
Longitudinal feed range: 0.063–10 mm/rev (18 settings)
Threading (metric/inch/module/DP): Metric: 0.4–71 mm; Inch: 0.016–0.56″; Module 0.16–4.5×p; DP 200–6
Power requirement: 380 V / 50 Hz; motor 9 kW or 16 kW depending on config
Machine weight: Approx. 5 t–6.5 t
Floor space requirement: ~3,400 × 1,500 × 1,600 mm
