Advent window with magnets
That’s when I had the idea of changeable pictures. I don’t glue the coffee capsules onto a canvas; instead, I glue a magnet onto the back of the capsule and then attach them to a whiteboard. This enables me to reuse the coffee capsules and create different images.
- The weight of the capsule has to be taken into consideration when choosing the magnets. Because of the shear force, the weight has to be multiplied by 6 to calculate the required adhesive force.
- The thickness and type of surface (magnetic board) plays an important part. Ideally, it should be steel with a thickness of at least 2 mm.
- The distance between the magnet and the surface is crucial. Even a distance of half a millimetre between the magnet and the metal surface can half the adhesive force of the magnet.
- Neodymium magnets are not suitable for outdoor use because they could rust.