Trikka Part Design Suggestions
A couple of things we suggest to consider when making Trikka parts – they are suggestions, not requirements.
Trikka is inspired by erector sets. Erector sets are modular toys where all parts can be connected to each other with nuts and bolts. The parts are multi-use. This works because the distance between the holes are the same in all parts. All parts are based on the same grid. Trikka tries to make this magic happen for its parts as well. The grid of Trikka uses a 30mm distance between the holes (or multiples thereof like 60mm, 90mm, 120mm etc. or for small parts half steps toward zero 15mm, 7,5mm). Whenever you add holes try to stay within this Grid. This will increase the likelihood of creative reuse of your parts by others. Some designers see this grid as a relief because it allows for quick decisions about how big or small something is. More about universal grids for everyday products and the origin of the 30mm-grid of Trikka you can read here & here.
Trikka aims to enable local repair, make and reuse. That’s why many parts in the catalogue are flexible when it comes to the choice of materials and also dimensions. Ideally Trikka parts can be made from a variety of materials using simple tools and still work in most designs.
The standard tolerance allows a size deviation of +/- 15mm from the values mentioned in the parts post. “Strong” material for example includes wood, metal or solid plastic but not bendable foil or foam.
Not affected by the tolerance is the number, position and diameter of the holes!
Tolerance may lead to cases where a part does not work in a design with that part (for example when the material is too weak or an uneven surface does not work). Le’s see if this really emerges and how big an issue it will be. Trikka is open research. Research with us.
The tolerance rule explains why bolts come in these steps:
10 – 30 – 50 – 70 – 90 – 110 – 130 – …
+/- 15mm allows to have all steps in between – for example 14mm.
A Trikka design-solution is a collection of open parts and a way to assemble them. Because there is a tolerance as to what materials parts are made of and what colour they are, there is not one final version of a Trikka design. When a Trikka design is made – turned into atoms – final decisions regarding colours, materials and even shapes are made. Different makers will get different results. But they all made the same Trikka solution – ideally you can disassemble them and swap parts between them.
To understand this better make sure not to miss what is said above about ↑ tolerance.
If you want to understand this better read here: “What is the final version in Open Circular Design?”