The Optimum D420x1000 lathe (often also marketed as the Optiturn D420) is a professional-class machine, known for its robustness and precision, ideal for machine shops and maintenance. In 2014, it represented the top of the range for medium-sized conventional turning. Here are the main technical features: 1. Working Capacity and Dimensions · Center height: 210 mm · Distance between centers: 1,000 mm · Maximum turning diameter over bed: 420 mm · Maximum turning diameter over slide: 250 mm · Maximum diameter over pocket (bridge): 590 mm · Bed width: 250 mm (induction-hardened and ground prism structure). 2. Headstock and Spindle · Spindle mount: Camlock DIN ISO 702-2 No. 6 (D1-6). · Spindle bore (bar passage): 52 mm (an excellent value for this size, allowing for the machining of large-diameter bars). · Spindle Taper: CM 6. · Speed ​​Range: 45 – 1,800 rpm. · Number of Speeds: 16 steps (oil bath gear change). 3. Feeds and Threads · Longitudinal Feeds: 0.05 – 1.7 mm/rev (17 steps). · Cross Feeds: 0.025 – 0.85 mm/rev (17 steps). · Metric Thread: 0.2 – 14 mm/rev (39 types). · Inch Thread (TPI): 72 – 2 threads per inch (45 types). · Modular/Diametric Thread: Supported for a wide range of pitches. 4. Tailstock · Tailstock Attachment: CM 4. · Quill Stroke: 120 mm. · Quill Diameter: 50 mm. 5. Motor and Mechanical Data · Main motor power: 4.5 kW (approximately 6 HP), 400V three-phase power supply. · Coolant pump: 100 W integrated. · Total weight: approximately 1,550 kg (the heavy weight ensures the absence of vibrations). · Overall dimensions: approximately 2,025 x 915 x 1,615 mm. Strengths of the 2014 model (Shown) · Meehanite cast iron base: Unique casting that provides extreme rigidity. · Digital readout (DPA): The 2014 model usually features the 3-axis DPA 21 system with glass optical scales, essential for decimal precision without backlash errors. · Central lubrication: Present on the carriage to facilitate maintenance of the guides. · Safety: Complies with CE regulations with mechanical foot brake for immediate stop. It is a "heavy" machine that should not be confused with hobby lathes; Requires installation on a level, solid surface to maintain precision tolerances.