Which kinds of frame variants were considered?
We tested different materials for the frame: pipes, flat iron, iron sheets and plastics. In the end, we decided to use water blasted or lasered symmetric flat iron, because it’s easy to process and connect. You can screw or weld it together and also produce plug elements with this technique.
The pipe frame is too expensive and a further problem is the coating on the inside wall.
What improvements have been introduced?
We were able to reduce the flat iron to 4 mm by putting the engine directly on the center of the frame, so we could renounce the weighty translation.
Every element on the frame should be manufactured out of the same piece. Improvement was constantly part of our work, during and after the tests. We tried almost every opportunity or thought about it at least, to create a simple and stable frame.
Corrosion is prevented through galvanization and/or coating. The combination of stainless steel on bearings and coated steel on the frame seems to work very well.
What could be better?
The connection between the frame and the fixing rope will be the next development step. This connection weakens the frame a little. Something like a tension belt on the right fixing point would be optimal.
Mixer (without Frame)