Does the hanger-fit width rule hold on fabrics with published KES-FB bending rigidity and weight?

What it found

hanger-sweep could not find measured fabric constants and swept them. This run uses a published KES-FB table (Ramaiah et al., fibre2fashion PDF, Table 3) for four fabrics: cotton single jersey, elastane single jersey, cotton shirting and heavy cotton suiting (bending rigidity 0.0066–0.125 gf·cm²/cm, weight 12.5–24.6 mg/cm²). On an M tee shape the best arm half width of the stock hanger is the half shoulder + 1 cm in all 12 cases (4 fabrics × stretch stiffness 40, 150, 800 N/m), best error 0.18–0.83 cm RMS; the suiting at 40 N/m nearly ties with +2 cm (0.83 vs 0.87). Bending rigidity and weight are sourced; stretch stiffness is swept because the table lacks it; the garment geometry and the tee mass scale are hanger-fit's assumptions for every fabric; the source fabrics are unfinished.

A figure from its own output

Paper, code and results

• README and method
• Experiments and results
• Code
• Tests

More in Laundry-hanging robots

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• Should a laundry-hanging arm also steer clear of the other arm's next pick? A paired test on 1000 loadsShould a laundry-hanging arm also steer clear of the other arm's next pick? No: paired on 1000 loads, lookahead loses to avoiding the current pick in 14 of 18 settings and ties in 4, by up to 11 an hour. Stylised: inputs are placeholders.
• What does it cost two laundry-hanging arms to empty the same dryer pile?What does it cost two laundry-hanging arms to empty one dryer pile and wait for each other? Blocking at 0.30 m clearance takes aiming from 201 to 191 garments an hour and blind pinching from 179 to 151; a third arm adds only 3 to 5. Stylised: clearance and spacing assumed.
• Can a laundry hanger be printed in two halves on a 220 mm bed, and is the bolted joint strong enough?Can a laundry hanger be printed in two halves on a 220 mm bed, and is the bolted joint strong enough? A half-lap hub joint with two M4 bolts lets every width up to XXL print on a 220 mm bed; the joint (safety factor 3.7–13) is then weaker than the arm (40–70), and printed pegs fail. Stylised, assumed material constants; nothing printed.
• Does the hanger-fit width result survive when its assumed fabric constants are swept two orders of magnitude?Does hanger-fit's "arm 1 cm wider than the half shoulder" survive 162 swept fabrics (bending rigidity 0.003–1, weight ×0.5–2, stretch 40–800 N/m, strip depth 10–30 cm)? Best offset is +1 cm in 151 and +2 cm in 11, all of them stretch 40 N/m; bending rigidity alone moves the best error under 10%. Constants swept, not sourced.

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Other research topics

Proper scoring & elicitation28Effort & peer prediction9Verification games & slashing19Detection & tolerances14Markets as routers13Prediction-market design9Paying contributors8Decentralised training systems23Digital twins & sim-to-real164LLM chip design loops40Robot manufacturing loops53Ambient AI assistant46Self-replicating manufacturing34Simulation-first design64Engineered clothing45Task-specific AI accelerators40Algorithmic chip-design loops42Open-source purpose-built robots44The software-engineering loop43Adversarial human imitation41Open-source residential construction41Autonomous multi-angle capture34Sensing, imaging and 3D31Energy supply and dense energy storage39Robot societies among people31Agentic co-design of low-cost robots27Laundry-hanging robots25Machine learning on qualitative data23Robots on the building site27Civilizations & group psychology1History & human sciences1

Produced with AI assistance (Claude). Results are from the code in this repository and are simulated or stylised unless the abstract says otherwise; nothing here implies affiliation with or endorsement by any lab, researcher or company cited. MIT licensed.