BEGIN:VCALENDAR
VERSION:2.0
PRODID:Linklings LLC
BEGIN:VTIMEZONE
TZID:Asia/Hong_Kong
X-LIC-LOCATION:Asia/Hong_Kong
BEGIN:STANDARD
TZOFFSETFROM:+0800
TZOFFSETTO:+0800
TZNAME:HKT
DTSTART:19911015T033000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTAMP:20251218T030653Z
LOCATION:Meeting Room S423+S424\, Level 4
DTSTART;TZID=Asia/Hong_Kong:20251215T170200
DTEND;TZID=Asia/Hong_Kong:20251215T171300
UID:siggraphasia_SIGGRAPH Asia 2025_sess113_papers_1426@linklings.com
SUMMARY:MiGumi: Making Tightly Coupled Integral Joints Millable
DESCRIPTION:Aditya Ganeshan (Brown University), Kurt Fleischer (Pixar Anim
 ation Studios), Wenzel Jakob (École Polytechnique Fédérale de Lausanne (EP
 FL)), Ariel Shamir (Reichman University), Daniel Ritchie (Brown University
 ), and Takeo Igarashi and Maria Larsson (University of Tokyo)\n\nTradition
 al integral wood joints, despite their strength, durability, and elegance,
  remain rare in modern workflows due to the cost and difficulty of manual 
 fabrication. CNC milling offers a scalable alternative, but directly milli
 ng traditional joints often fails to produce functional results\nbecause m
 illing induces geometric deviations---such as rounded inner corners---that
  alter the target geometries of the parts. Since joints rely on tightly fi
 tting surfaces, such deviations introduce gaps or overlaps that undermine 
 fit or block assembly. We propose to overcome this problem by (1) designin
 g a language that represent millable geometry, and (2) co-optimizing part 
 geometries to restore coupling. We introduce Millable Extrusion Geometry (
 MXG), a language for representing geometry as the outcome of milling opera
 tions performed with flat-end drill bits. MXG represents each operation as
  a subtractive extrusion volume defined by a tool direction and drill radi
 us. This parameterization enables the modeling of artifact-free geometry u
 nder an idealized zero-radius drill bit, matching traditional joint design
 s. Increasing the radius then reveals milling-induced deviations, which co
 mpromise the integrity of the joint. To restore coupling, we formalize tig
 ht coupling in terms of both surface proximity and proximity constraints o
 n the mill-bit paths associated with mating surfaces. We then derive two t
 ractable, differentiable losses that enable efficient optimization of join
 t geometry. We evaluate our method on 30 traditional joint designs, demons
 trating that it produces CNC-compatible, tightly fitting joints that appro
 ximates the original geometry. By reinterpreting traditional joints for CN
 C workflows, we continue the evolution of this heritage craft and help ens
 ure its relevance in future making practices.\n\nRegistration Category: Fu
 ll Access, Full Access Supporter\n\nSession Chair: Peng Song (Singapore Un
 iversity of Technology and Design (SUTD))\n\n
END:VEVENT
END:VCALENDAR