progress report: materials testing manotech associates jina kim forrest liau david lin teresa wang
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Progress Report:Materials
TestingManoTech AssociatesJina KimForrest LiauDavid LinTeresa Wang
Review of Project Goals
Fulfills two criteria: Low-cost materials Anatomically user-matched
Does not include: Detailed hand aesthetics (color, texture, etc.) Articulating joints
Progress Overview
Interview with Charles Mathis
“Clay Block” Materials
Reversible Glove Possibilities
The 4-Step Process
Interview with Charles Mathis ManoTech met Charles last Thursday, 3/9 Watched and practiced making wax molds
Wax
Advantages Gives better detail and shape of hand in final mold little shrinkage Is relatively easy to use Allows for mistakes
Disadvantages Must be maintained at 120 degrees F in a larger
pot or deep-fryer
Kidz EZ Cast Mold
Advantages MoldGel sets in 4 – 5 min. Works at room
temperature
Disadvantages Lumpy mixture Water leaks from bottom Air bubbles reduce detail
5-Minute Molding Putty
Advantages Not messy Takes ~10 minutes to set at
room temperature
Disadvantages Requires significant amount of
material Difficult to mold exactly around
the hand and maintain shape
Mini Casting Kit
Advantages Comes in a kit
Disadvantages Vapor and powder is toxic Requires 4 – 8 hours for mold to set around hand
Cannot be used
Gypsum-based Plaster of Paris Advantages
Cures at room temperature in 1.5 hours
Retains detail of initial mold
Disadvantages Hardened material is brittle,
easily cracked Transfers bubbles and
cracks to solid hand
Brushable Latex
Advantages Brushes on easily Reversible Maintains shape Able to use leftover latex
Disadvantages Needs ~10 coats with a 20-minute incubation
between coats
RTV Polyurethane
Advantages Very elastic Potential to be reversed
Disadvantages 30-minute pour time Messy By dipping, creates non-uniform layer Dipping twice gave a thin coat that rips
Summary of Materials
Initial Mold
Solid Hand
Reversible Mold
Wax EZ Mold Molding
Putty Casting Kit
Plaster of
Paris
Brushable
Latex RTV
Polyurethane
Prosthetic Hand
Silicone
Rubber Polyurethane
Foam
Schedule
March April May6 13 20 27 3 10 17 24 1 8 15
Init. Mold Solid Hand Rev. Mold Fin. Und. Prod. PrototypeMaj. Test.B. PlanPoster/present.
Materials Selection Process Optimization
TODAY
Future Plans Procedures
Improve reversible mold-making method
Materials Optimization Solid hand mold Prosthetic
Hardness & Elasticity Testing Underlayer: silicone rubber Reversible material: latex, RTV polyurethane
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