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3D Modelling and Printing of Microtonal Flutes University of Wollongong Research Online Faculty of Law, Humanities and the Arts - Papers Faculty of Arts, Social Sciences & Humanities 1-1-2016 3D Modelling and Printing of Microtonal Flutes Matthew Dabin University of Wollongong, [email protected] Terumi Narushima University of Wollongong, [email protected] Stephen T. Beirne University of Wollongong, [email protected] Christian H. Ritz University of Wollongong, [email protected] Kraig Grady North American Embassy of Anaphoria Island, [email protected] Follow this and additional works at: https://ro.uow.edu.au/lhapapers Part of the Arts and Humanities Commons, and the Law Commons Recommended Citation Dabin, Matthew; Narushima, Terumi; Beirne, Stephen T.; Ritz, Christian H.; and Grady, Kraig, "3D Modelling and Printing of Microtonal Flutes" (2016). Faculty of Law, Humanities and the Arts - Papers. 2798. https://ro.uow.edu.au/lhapapers/2798 Research Online is the open access institutional repository for the University of Wollongong. For further information contact the UOW Library: [email protected] 3D Modelling and Printing of Microtonal Flutes Abstract This project explores the potential for 3D modelling and printing to create customised flutes that can play music in a variety of microtonal scales. One of the challenges in the field of microtonality is that conventional musical instruments are inadequate for realising the abundance of theoretical tunings that musicians wish to investigate. This paper focuses on the development of two types of flutes, the ecorr der and transverse flute, with interchangeable mouthpieces. These flutes are designed to play subharmonic microtonal scales. The discussion provides an overview of the design and implementation process, including calculation methods for acoustic modelling and 3D printing technologies, as well as an evaluation of some of the difficulties encountered. Results from our 3D printed flutes suggest that whilst further refinements are necessary in our designs, 3D modelling and printing techniques offer new and valuable methods for the design and production of customised musical instruments. The long term goal of this project is to create a system in which users can specify the tuning of their instrument to generate a 3D model and have it printed on demand. Keywords microtonal, flutes, printing, modelling, 3d Disciplines Arts and Humanities | Law Publication Details Dabin, M., Narushima, T., Beirne, S. T., Ritz, C. H. & Grady, K. "3D Modelling and Printing of Microtonal Flutes." Proceedings of the 16th International Conference on New Interfaces for Musical Expression (NIME 2016). Brisbane, Australia: Queensland Conservatorium Griffith University, 2016. 286-290. This conference paper is available at Research Online: https://ro.uow.edu.au/lhapapers/2798 3D Modelling and Printing of Microtonal Flutes Matthew Dabin Terumi Narushima Stephen Beirne University of Wollongong The Arts, English and Media Australian Institute for NSW, Australia University of Wollongong Innovative Materials [email protected] NSW, Australia University of Wollongong [email protected] NSW, Australia [email protected] Christian Ritz Kraig Grady Electrical, Computer and University of Wollongong Telecommunications NSW, Australia Engineering [email protected] University of Wollongong NSW, Australia [email protected] ABSTRACT these instruments rely on non-3D printed hardware (such as This project explores the potential for 3D modelling and pickups, bridges, necks and machine heads) for their sound printing to create customised flutes that can play music in production [7]. a variety of microtonal scales. One of the challenges in the In contrast, our project takes advantage of 3D printing's field of microtonality is that conventional musical instru- unique ability to customise designs for the purpose of creat- ments are inadequate for realising the abundance of the- ing flutes that can play microtonal tunings not possible on oretical tunings that musicians wish to investigate. This standard instruments. 3D CAD software is used to gener- paper focuses on the development of two types of flutes, the ate 3D models of the flutes and these are then printed using recorder and transverse flute, with interchangeable mouth- high resolution inkjet based 3D printing technology (Objet pieces. These flutes are designed to play subharmonic mi- Connex 350). Comparisons between the theoretical models crotonal scales. The discussion provides an overview of the and actual 3D printed flutes allow for greater understand- design and implementation process, including calculation ing of the acoustics of microtonal wind instruments. The methods for acoustic modelling and 3D printing technolo- long term goal of this new approach is to create a system gies, as well as an evaluation of some of the difficulties en- in which, instead of the manufacturer dictating the tuning, countered. Results from our 3D printed flutes suggest that musicians are able to customise the tuning of their instru- whilst further refinements are necessary in our designs, 3D ment for their own unique needs and have it printed on modelling and printing techniques offer new and valuable demand. methods for the design and production of customised mu- 1.2 Microtonality sical instruments. The long term goal of this project is to create a system in which users can specify the tuning of their Microtonality is a label that refers to tuning systems that instrument to generate a 3D model and have it printed on include intervals smaller than the regular semitone, but it demand. can also refer more generally to any scale other than the con- ventional Western system of 12-tone equal temperament. It is often assumed that 12-tone equal temperament, best rep- Author Keywords resented by the 12 black and white notes of the keyboard, is 3D printing, acoustic modelling, design, flute, microtonal a universal standard, and most of the music we hear today tuning, recorder in the West is built around this scale. In reality, however, many other systems of tuning are possible. For example, a rich variety of scales with many more notes than just 1. INTRODUCTION 12 are found in music from different cultures of the world, 1.1 Background and Western music itself has a long history of different tun- In recent years, there have been several examples of musical ings also. Microtonal tuning is a rapidly expanding area instruments made with 3D printing. Many of these projects in which musicians from various genres are experimenting tend to replicate existing instruments for comparison with with a diverse range of tuning systems in their search for the sounds of the original model, such as a 3D printed copy new resources for making music. In the future, instead of of a Stradivarius violin [20] or a 3D printed flute [25]. Oth- a single system, it is likely that musicians will adopt many ers have used 3D printing to create new instrument bod- different approaches to tuning. ies or shells for electric guitars, drums and keyboards, but 1.2.1 Microtonal Instruments One of the challenges in the field of microtonality is that conventional musical instruments are inadequate for real- ising the abundance of theoretical tunings that musicians Licensed under a Creative Commons Attribution wish to investigate. Already there is significant interest in 4.0 International License (CC BY 4.0). Copyright instruments with microtonal capabilities, such as keyboards remains with the author(s). [16] and re-fretted guitars [22], but there seem to be very NIME’16, July 11-15, 2016, Griffith University, Brisbane, Australia. few microtonal wind instruments on the market. Flutes are of particular interest because they are consid- 286 ered to be amongst the oldest instruments in existence and longer. This is why instrument building is often an iter- they are also found in many cultures around the world [18]. ative subtractive process in which the instrument maker There are different types of flutes, from side-blown to end- begins with a longer tube and then gradually reduces the blown examples, as well as whistles, ocarinas, panpipes and length until a desired tuning is achieved. Another reason so on. For our project we chose to focus on two types of for this manual tuning requirement is due to traditional flutes: the recorder, or fipple flute, because they are rela- manufacturing processes resulting in variations between one tively easy to play and maintain a stable pitch, and a simple produced instrument and another. Contrary to this, 3D transverse flute, without movable parts such as keys for the printing is an additive technique that allows for very exact time being, in order to begin with a minimal design. manufacture of physical components and parts based on 3D Zoran demonstrated that a replica concert flute could be design models. Hence, manufacturing variations between produced with 3D printing [25] but there were problems different produced instruments are significantly reduced and with water-tightness of walls and decomposition of material, the key task is to design an accurate 3D model. which meant the flutes were not musically viable. More re- cently, Harrison has also developed software for 3D printing 2.1 Calculation and Methodology various flutes, whistles and shawms [10], but none of these Producing a complete mathematical model of a wind instru- are designed to play microtonal scales. Furthermore, there ment is a challenge. While a model may very accurately is no literature explaining or validating the mathematical match a particular style and tuning system, when certain methodology behind these designs. characteristics of the instrument are changed the model may It is possible for wind players to achieve microtonal pitches diverge greatly from what is expected. To calculate the de- on their instruments using normal performance techniques sign parameters of wind instruments a number of techniques such as adjusting their embouchure, or varying the speed have previously been explored. The two main methods are and direction of the air stream. It is also common for cross- direct numerical simulation and approximation of acoustic fingerings to be used [4] and much research has been done impedances by bore segmentation.
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