Freeform machining of ophthalmic toric lens mould using fast tool servo-assisted ultra-precision diamond turning process
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2020-10-12 |
| Journal | Journal of Micromanufacturing |
| Authors | Ishan Anand Singh, Gopi Krishna S., T. Narendra Reddy, Prakash Vinod |
| Institutions | Central Manufacturing Technology Institute |
| Citations | 3 |
Abstract
Section titled āAbstractāThis research aims to establish a methodology for machining of toric lenses, using fast tool servo-assisted single point diamond turning and to assess the generated surface for its characteristics. Using the established mathematical model, toric surface is explained to understand the geometry and to generate the parameters required for fast tool servo machining. A toric surface with a major diameter of 18.93 mm and a minor diameter of 15.12 mm has been cut on the intelligent ultra-precision turning machine (iUPTM). The surface profile and surface roughness were measured. After analysing the measurement data of the machined surface, on two perpendicular axes of the toric lens, form accuracy of 0.49 Āµm peak-to-valley (PV), and surface roughness of 12 nm in Ra, 4-8 nm in Sa are obtained. From the experimental results obtained, it can be concluded that the proposed method is a reasonable alternative for manufacturing toric lens mould.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
Section titled āReferencesā- 2008 - Introduction to ophthalmic optics
- 2012 - Handbook of optical systems, volume 5: Metrology of optical components and systems
- 2011 - Proceedings of SPIEāthe international society for optical engineering
- 2018 - Diamond turn machining theory and practice