One of my customers is interesting by cnс lathe machine, approximately parameters are below. 1. Parameters of the workpiece 1.1 Maximum diameter above the bed mm - 520 1.2 Maximum machining diameter mm - 350 1.3 Maximum machining length mm - 500 1.4 Standard chuck size inch - 10 2.CNC system 2.1 Siemens 828D 3. Spindle 3.1 Drive type - Belt drive 3.2 Spindle flange type A2-8 3.3 Through-hole diameter mm - 74 3.4 Bar diameter mm - 63 3.5 Spindle front bearing diameter mm - 120 3.6 Spindle speed rpm - 50-3500 4. Turret 4.1 Height to center of turret mm - 100 4.2 Number of tool positions - 12 4.3 Diameter mm - 380 4.4 Maximum diameter of the boring mandrel mm - 40 4.5 Cutter cross-section size mm 25 x 25 5. Feed 5.1 Positioning X, Z mm - ±0.005 5.2 Repeatability X, Z mm - ±0.003 6. X axis 6.1 Stroke in the X axis mm - 200 6.2 Traveling speed m/min - 24 6.3 Ball screw diameter and pitch mm - 40 x 10, class C3 6.4 Guideway width mm- 35 roller, class P4 7. Z axis 7.1 Z-axis travel mm - 510 7.2 Traveling speed m/min - 24 7.3 Ball screw diameter and pitch mm - 40 x 10, class C3 7.4 Guideway width mm - 35 roller, class P4 8. Hydraulic tailstock 8.1 Quill type MT-5 8.2 Quill stroke mm - 100 8.3 Tailstock travel mm - 300 8.4 Maximum clamping force kg - 20-25