A couple years ago, I saw a picture of a ring surrounded by little gears, which would spin when the top and bottom were rotated (made by kinekt):
I asked my dad if we could make something like that, and he suggested making something larger. We designed a bracelet surrounded by gears which could be spun with a finger. I had a lot of help in the SolidWorks department, since I was pretty new at 3D modelling. This is what we came up with:
We 3D printed it cuz ain’t nobody gonna machine that.
This is actually the second one we printed, because the first one broke–multiple times. We added screws because they worked better at holding things together than the original epoxied-in caps. We also had to fiddle with the gears a bit to get them to turn smoothly.
I coated it in enamel paint (our 3D printing plastic isn’t very pretty), but as you can see it wore off a bit.
It’s fun to play with, but it doesn’t look amazing, and being big enough to fit over my hand it is awkwardly large. I’ve since fully redesigned it. Here are some of the iterations:
The last one is the version I’m making. I designed my own gears this time, instead of using someone else’s design as a base model. I made them bevel gears, so this time they’re actually meant to mesh at an angle to one another. I’m also splitting the body of the bracelet into two halves, which will snap together with magnets. The gears will be mounted on bearings.
It was an interesting experience making the gear models, but not only did I do all my calculations on a scrap of paper (long lost now) rather than an excel worksheet (like an intelligent person would have) I did a horrible job making the model. The final result is fine as long as you don’t wan’t to modify ANYTHING.
Don’t use the scaling tools kids. As tempting as it is.
3D sketches are their own special type of hell.
Also, if you don’t end up using a feature/sketch/plane/whatever, DELETE IT. DON’T LEAVE IT TO GIVE BIRTH TO LITTLE DEMON ERROR BABIES THEY WILL EAT YOUR MODEL AND YOUR SANITY
ok, sorry, done now
The original idea was to cast all the components, but my dad and I realized it would be possible to machine the body of the bracelet, which I’m currently doing. We’re going to try to machine the gears as well, because CNC is magic.
I’ll post pictures of the end product if/when I ever manage to finish it c:
This is what Ingemar and I worked on for a good part of April and May at our job.
We were assigned to build a 1/15 scale model of the Solar Probe Plus spacecraft to be used for rheometry testing: measuring the electric fields produced by the spacecraft to determine the best placement and length for the instrument antennas. The size and complexity of the model made machining quite educational!