McCall, BrianTkaczyk, Tomasz S.2013-12-202013-12-202013McCall, Brian and Tkaczyk, Tomasz S.. "Rapid fabrication of miniature lens arrays by four-axis single point diamond machining." <i>Optics Express,</i> 21, no. 3 (2013) Optical Society of America: http://dx.doi.org/10.1364/OE.21.003557.https://hdl.handle.net/1911/75304A novel method for fabricating lens arrays and other nonrotationally symmetric free-form optics is presented. This is a diamond machining technique using 4 controlled axes of motion – X, Y, Z, and C. As in 3-axis diamond micro-milling, a diamond ball endmill is mounted to the work spindle of a 4-axis ultra-precision computer numerical control (CNC) machine. Unlike 3-axis micro-milling, the C-axis is used to hold the cutting edge of the tool in contact with the lens surface for the entire cut. This allows the feed rates to be doubled compared to the current state of the art of micro-milling while producing an optically smooth surfaceengArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttp://dx.doi.org/10.1364/OE.21.003557