I designed and CNC milled a two piece mould foot that can be used to create negative soft rubber moulds. These moulds can be used for experimenting with different casting solutions and techniques. The positive master mould can also be used for shell forming techniques with a leather and other materials. Continue Reading →
An important criteria for the low cost prosthetics program is cheap and locally available materials. We started experimenting with local fibers that can be found throughout Indonesia. In combination with a resin they can form strong and lightweight parts, especially the pineapple fibre looks promising. Next step would be to find a local polyurethane like resin made from biological ingredients.
I finally seized the chance to experiment with wet forming leather. Since it was Tommy’s birthday and I had a bottle of Arak to share with him, I decided to try to mould the leather into a nice giftwrap. Continue Reading →
We used a two component rubber resin of polyurethane type for this prototype. The wedge shaped rubber will provide exponential resistance as the prosthetic foot bends forward. The rubber also packs around the metal hinge pin to reduce shear stress. Continue Reading →
To get some feedback on the potential of the rubber wedge foot, we CNC milled a sketch at HONFablab Indonesia. We used massive wood of the Keruing type and a flip part setup to create the parts. Continue Reading →
This is an illustration of the a design principle for the 50dollar prosthetic leg program. The basic principle is to use a a rubber wedge that will create exponential resistance as the foot fends. The amount of resistance can be varied by casting different stiffness of rubber or by creating open “pockets” within the cast rubber. The design is largely based upon design input from Haakon Karlsen at MIT FabLab Lyngen. Continue Reading →
I made the layer chair as an example of how to work with large organic surfaces on the shopbot. It was also a good excuse to make something a bit more refined and comfortable for the interior of the HONFablab. It is parametric design made in Grashopper, which makes it very easy to adjust the sitting profile, width, height, material thickness and so on. The Grasshopper definition uses two input curves. One for the midprofile of the seat, and one for the sideprofile. The definition outputs cutting lines, alignment holes and “trim lines” for making the inside of the seating more organic. In a way it is 2.5D process with manual control of the steps used to create the 3D surface.
The reactive machine enables you to adjust the parameters of a design by shuffling markers on the glass surface. This first iteration was made in one day using the ShopBot in the HONFablab. More documentation coming soon. Continue Reading →
This is an ongoing experiment into a grasshopper definition that creates furniture from a single curve. More info coming soon. Continue Reading →
HONF organized a workshop on spen source design and digital fabrication. I presented my views, approach and findings so far in my research. In the coming year, HONF will organize an open design competition in the style of the Unlimited Design Contest. HONF has a very high level of sharing and openness in their work, at the same time many other artists in Yogyakarta are very protective. It will be very interesting to see how javeneese culture will merge with open design practises. Continue Reading →