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Single Point Diamond Turning (SPDT)

SPDT is an ultra-precision machining process, which delivers Optical Profiles with Form and Figure errors within sub-micron Tolerances & Super-Smooth surfaces with roughness contained within few nanometers.

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Description

HOW SPDT IS ACHIEVED?  

SPDT Process is a Near-Ideal combination of: Precision Diamond Tool of Designated Geometry, Controlled Precision Turning Operations, Deterministic Material Removal, Meticulous Machining Protocols, Detailed Dimensional Metrology and Accurate Surface Characterization


WHY SPDT IS REQUIRED?

  • To Develop Optical Surfaces with Sub-Micron Form & Figure Error and Single Digit Nanometric Finish
  • To Deliver Near-Theoretical Optical Performances
  • To extend the Optical Performances from Spherical to Non-Spherical Surfaces
  • To Develop Systems with Budgets on Weight, Volume & Foot-Print
  • To Deliver Neo-Compact Precision Modules.

 CAPABILITIES:

At the Diamond Turning Facility of OPTICA the following Optical Profiles can be developed:

  • Flats
  • Rotationally Symmetric Conic Profiles (Spherical, Oblong Elliptical, Prolate Elliptical, Parabolic,Hyperbolics)
  • Off-Axial Components
  • Toric Surfaces (with Fast & SlowTool Servo Accessory)
  • Lenslet Arrays
  • Freeform Surfaces with limited definitions
  • Ultra-High Precision Mechanical Modules with definable geometries

We can process the following Materials at our Facility:

 

Metals:

Non-Ferrous Metals, Aluminum & Al-Alloys, Brass, Bronze, Copper & Cu-Alloys, Nickel, Electro-less Nickel, Tin, Antimony, Silver, Low-Carbon Steels & Special High-HRC Steels

 

IR Materials:

Germanium, Silicon, Calcium Fluoride, Zinc Sulphide, Zinc Selenide, Chalcogenide Glasses and IRG-Series

 

Polymers:

PMMA, Poly Carbonate, (COP) Cyclo Olefin Polymer (ZEONEX etc), Polystyrene, Poly Ether Imide, ULTEM etc.


SURFACE PROFILE QUALITY PARAMETERS:

 

The surface quality of the Diamond Turn-generated profile depends on the Substrate Material, Workpiece Geometry, Precision Diamond Tools deployed, Design specifications, Work-piece Applications, Operating conditions etc.


At OPTICA, we routinely develop surface profiles with better than one wavelength Power (Form) Error, λ/3 – λ/10  (PV) Figure Error, λ/20 – λ/50 (RMS) Figure Error and Finish within 2-10 nm (Ra) of Roughness.


The Profile surface quality can be tailored as per the customers’ requirements.

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