The object is made of an upholstered metal frame resting on heavy-duty plywood rocking legs. It contains a pressure sensitive switch in the seat, which when activated, starts up a vibrating motor. Unplugged, it is suitable for children.
I tend to do only high level planning and then work out the details as I go along, so I have very few design notes and I ended up changing it up a fair amount when I encountered fabrication constraints. The notes are here, though, in case you are interested in my minimal design process.
After making this one, I made two more, in different mustache styles. I used the same basic technique so I didn't take any in progress pictures, but I include some finished pictures. The second is a blond walrus mustache style, which I associate strongly with the 70's so I tried to make the legs kind of 70's blobby/colorful. The final one is a Fu Manchu style, with a Chinese red set of legs.
Step 1: Saddle frame overview
- about 8 feet of 1" square stock of mild steel
- 18 springs reclaimed from an abandoned mattress
- about 10 feet of coiled wire spring from the same mattress
- oxy-acetylene torch
- MIG welder
- angle grinder
- soap stone or chalk
- grinding wheel
- welding table (not essential but it helped)
- metal chopsaw (angle grinder can be used instead)
I drew a picture of half of the top-down view of the frame (including spring layout), and half of the side view (without springs). I drew some guide lines as well to help me keep track of what curves went where.