Something Big: An Extending Furniture Object
My original idea was to make a chair that could be extended into a bench.
I wanted to use scissor-like extension. In the process I (i) wrote a
small Mathematica package the implements math string-style plotting,
(ii) experimented with Inkscape (iii) made a cardboard prototype and a wood prototype based on different
concepts, (iv) partially completed the full-size version using the
ShopBot to cut plywood.
Math Strings in Mathematica
Here is a Mathematica package I wrote to do
3-d Boolean function-based modeling.
Below is an initial sketch for a chair profile that I sketched in Inkscape
using Bezier curves.
I made a cardboard prototype using a vertical-planar scissor design.
This concept was limited by the fact that increasing the range of the
scissor motion beyond a certain point weakened and eventually severed
the geometry of the part.
The wooden prototype was the same as the final design. However, I choose
the tightening parameter to be slightly too large, so that the parts had
to be hammered into place. Needless to say, the prototype has limited
flexibility. Importantly, however, the prototype proved that the design
can be constructed with rigid parts using locking and rotating actions.
Full Size Parts
Although I did not complete the full-sized furniture object, the principle
has been demonstrated by the parts that I have constructed. In fact, the
only thing missing is more copies of the parts that I have already made.