CNC CNC Sr. no Parameters Specifications 1 Machine axes X, Z, C, B ( Four axes) , Refer fig-1 for axes. 1.1 Machine Configuration Ultra-Precision four axis CNC single point diamond turning machine for on-axis turning of spheric, aspheric, toroidal surfaces, machining of diffractive surfaces, etc. 1.2 Max work piece capacity 700 mm diameter x 300mm long 1.3 Base Structure Monolithic composite polymer granite/ Natural granite base. 1.4 Vibration Isolation Vibration isolation system (air) with self-leveling 1.5 Computer System Specifications Intel i5 2.4 GHz processor, 16GB DDR3 1600MHz memory, external customer Ethernet connection, DVD RW Drive, 500GB 7200 RPM Hard Drive, 22” wide display, USB ports. Windows 7 Professional / QNX real time operating system. 1.6 Control System UPx™ Control System with optional Adaptive Control Technology OR Delta Tau 1GHz Power PMAC Embedded Real-time 64-bit Linux Motion Controller Windows 7 based HMI with a Touch / Swipe Gesture Interactive display / 1.7 Programming Resolution 0.01 nanometer linear / 0.0000001° rotary 1.8 Desired Functional performance Form Accuracy (P-V): ≤ 0.15μm on 75mm diameter convex sphere having radius of curvature 250 mm. Surface Finish MACHINE
4.5 Drive System Brushless DC motor 4.6 Axial Stiffness ≥ 875 N/μm 4.7 Radial Stiffness (at nose) ≥ 260 N/μm 4.8 Moment Stiffness ≥ 15N-m/micro rad 4.9 Positioning Accuracy ≤ ± 1.0 arc seconds 4.10 Feedback Resolution ≤ ± 0.005 arc seconds 4.11 Maximum Speed (Positioning Mode) ≥ 10 RPM 4.12 Motion Accuracy Axial/Radial : ≤ 0.1μm 4.13 Coning error ≤ 1 nm/mm 5 Rotational Axes C Axis 5.1 Type Air Bearing (liquid cooled) / Slot type thrust bearing ( Steel shaft, bronze journal) 5.2 Travel 360° (Bi-directional) 5.3 Drive System Brushless motor 5.4 Positioning Accuracy ≤ ± 2.0 arc seconds 5.5 Feedback Resolution ≤ 0.026 arc seconds 5.6 Maximum Speed (Positioning Mode) ≥ 3,000 rpm 6 Work holding Spindle 6.1 Type Air bearing type 6.2 Thermal control system for work spindle liquid cooled closed loop chiller to maintain temperature within ± 0.1° C 6.3 Speed Range 50 to 5,000 rpm or more, bi-directional
6.4 Swing Capacity 700mm diameter 6.5 Working Load Capacity (Radial) ≥ 85 Kg 6.6 Axial Stiffness ≥ 228 N/μm 6.7 Radial Stiffness (at spindle nose) ≥ 98 N/μm 6.8 Drive System Brushless motor 6.9 Motion Accuracy Axial/Radial: ≤ 50 nm 7 Software CAM software package: It should generate part program for ultra-precision machining of 2D and 3D optical surfaces using X, Z, C, B machine axes. It shall have provision for corrective feedback functionality. This software shall also support CNC programming for aspheric, diffractive and freeform surfaces and shall have provision for various inputs like importing of CAD files (STEP and IGES). 8 Work piece Balancing system Balancing system ( both hardware and software) for balancing of work spindle, mounting fixture and work piece 9 Air Temperature Control System Floor standing system with flexible machine attachment. It shall be attached to machine enclosure. It shall maintains air temperature to ± 0.1 °C 10 Optical Observation system Camera ( with zoom lens) with magnetic base and on screen display. 11 LVDT Probe LVDT probe to measure and locate work piece position. LVDT shall have fixture to mount it on the Z slide or B tabletop. 12 Utility cabinet Utility cabinet with required Hydraulics, Pneumatics, and Electrical systems to operate machine 13 Hydraulic system Hydrostatic pump unit with oil reservoir tank 14 Electrical cabinet CE certified cabinet to house electrical system
4.4 Travel 360° 4.5 Drive System Brushless DC motor 4.6 Axial Stiffness ≥ 875 N/μm 4.7 Radial Stiffness (at nose) ≥ 260 N/μm 4.8 Moment Stiffness ≥ 15N-m/micro rad 4.9 Positioning Accuracy ≤ ± 1.0 arc seconds 4.10 Feedback Resolution ≤ ± 0.005 arc seconds 4.11 Maximum Speed (Positioning Mode) ≥ 10 RPM 4.12 Motion Accuracy Axial/Radial : ≤ 0.1μm 4.13 Coning error ≤ 1 nm/mm 5 Rotational Axes C Axis 5.1 Type Air Bearing (liquid cooled) / Slot type thrust bearing ( Steel shaft, bronze journal) 5.2 Travel 360° (Bi-directional) 5.3 Drive System Brushless motor 5.4 Positioning Accuracy ≤ ± 2.0 arc seconds 5.5 Feedback Resolution ≤ 0.026 arc seconds 5.6 Maximum Speed (Positioning Mode) ≥ 3,000 rpm 6 Work holding Spindle 6.1 Type Air bearing type
6.2 Thermal control system for work spindle liquid cooled closed loop chiller to maintain temperature within ± 0.1° C 6.3 Speed Range 50 to 5,000 rpm or more, 6.4 Swing Capacity 700mm diameter 6.5 Working Load Capacity (Radial) ≥ 85 Kg 6.6 Axial Stiffness ≥ 228 N/μm 6.7 Radial Stiffness (at spindle nose) ≥ 98 N/μm 6.8 Drive System Brushless motor 6.9 Motion Accuracy Axial/Radial: ≤ 50 nm 7 Software CAM software package: It should generate part program for machining of 2D and 3D optical surfaces using X, Z, C, B machine axes. It shall have provision for corrective feedback functionality. This software shall also support CNC programming for aspheric, diffractive and freeform surfaces and shall have provision for various inputs like importing of CAD files (STEP and IGES). 8 Work piece Balancing system Balancing system ( both hardware and software) for balancing of work spindle, mounting fixture and work piece 9 Air Temperature Control System Floor standing system with flexible machine attachment. It shall be attached to machine enclosure. It shall maintains air temperature to ± 0.1 °C
10 Optical Observation system Camera ( with zoom lens) with magnetic base and on screen display. 11 LVDT Probe LVDT probe to measure and locate work piece position. LVDT shall have fixture to mount it on the Z slide or B tabletop. 12 Utility cabinet Utility cabinet with required Hydraulics, Pneumatics, and Electrical systems to operate machine 13 Hydraulic system Hydrostatic pump unit with oil reservoir tank 14 Electrical cabinet CE certified cabinet to house electrical system 15 Warranty One Year onsite warranty 16 Flat vacuum chuck 16.1 Size 100mm ( 1 nos) 16.2 Size 150mm ( 1 nos) 16.3 Size 200mm ( 1 nos) 17 Spray mist coolant system Spray mist coolant system with 2 Nozzles. 18 Optical tool setting system To locate precise location of tool relative to spindle centerline. It shall have features for inspection of tool tip. 19 Self‐Leveling System for Air Vibration Isolation Dampers It shall provide self-maintenance of the machine’s air isolation system to ensure both proper float and table levelness as weight is added or removed from the Z‐axis slide or main work spindle.