Step 1: Laser Cut Record (version)
The records were cut on a Universal 30 Watt VLS 2.30 with HPDFO (High-Power Density-Focusing Optics) lens to a theoretical precision of 1000dpi. The bit rate / sampling frequency of the original audio data is 16 bit / 44.1kHz but you could just listen the result around 8 bit / 12 kHz (the number is not well measured, but you could listen the quality) because of the melt on a material by laser beam and the motion of stepping motor (we guess). We've wrote a custom application with Processing to generate a spiral groove with peripheral circle and a center hole in a form of SVG file based on given audio data. The application provides parameters of diameter, sampling rate, rpm, amplitude, line space, and margin for adjustment. The resulted SVG file could be imported in other vector graphics software (e.g Adobe Illustrator, Corel Draw) for laser cutting. We also develop a way to produce a locked groove with audio data without coding, you could see the way at the end of this instructables.
You could see more information at Kazuhiro Jo and Mitsuhito Ando, cutting record - a record without (or with) prior acoustic information, Proceedings of NIME (New Interfaces for Musical Expression) 2013 , 26th-30th, May, 2013 (to be published).
Laser Cut Record - Daisy Bell