Halloween 2018: Fusion360ing
One of Haruko's most iconic pieces is her bracelet/cuff that is connected to Atomsk - she wears it on her left hand through just about the whole show, and the chain link that's attached to it corresponds to one on Atomsk's beak. In a few sequences, you can hear it clink, so it's very obviously metal.
The tough part here was there there's no obvious seam in the shots and artwork where she's wearing the cuff. It's snug around her wrist, so it has to be just big enough for her to get her hand through, yet small enough to fit well. I'll have to design a pull-on cuff for accuracy, though my hands are pretty big, so I may have to do some hidden trickery if I can't get a pull-on cuff to be accurate enough.
The cuff is also not super wide on her forearm, just a little more than her entire wrist joint, and is made up of three sections: two symmetrical outer segments that pancake a middle section with a smaller outer diameter and three extrudes sections. The lines between those sections appear to be painted black. Looking at the artwork, there are holes drilled around the outer sections that appear chamfered, and we only ever see two of these at a time in shots or in artwork. They appear to be about a third of the size of the outer sections, in terms of diameter. With that logic, I think there are probably four holes drilled around each outer section. The thickness is about a centimeter, maybe more, and it's lined with what looks like red fabric. The chain link, when flat, sits off the cuff just a bit, and can move freely where it's connected. It also appears to have a taper, but if you look at the artwork you realize that's all just exaggerated perspective.
Okay, I can work with that.
The first thing I did was sit down in Fusion 360 and mock up a quick design. I like using Fusion for these sorts of things because you can edit user parameters and change them later on the fly, so it'll be easy for me to tweak measurements on the cuff as I prototype it.
Once I had something I liked, I exported and STL and sent it to the printer. I was doing some additional work and noticed that it was printing way larger than I had intended - ack! I quickly made some adjustments, kicked off a new print, and went to bed. In the morning, I work up to this!
It's a nice first prototype, but there are few things I definitely need to fix. It's still way too big, and much too wide. Thankfully because I set up my parameters nicely in Fusion, with about five minutes worth of work I had a new version that I could print.
This version was much more what I was looking for size wise, but I can go a tiny bit smaller on the inner diameter. It still hangs pretty loosely off my arm, which I definitely don't want, so I may have to revisit my methods. Also, the link isn't moving freely, so I need to fix that, but it's super close. I will re-print it tonight.
I also wanted to use Fusion for the bass guitar motor. The motor that's on the back of Haruko's bass looks very similar to a lawnmower pull starter, so I grabbed one off of Amazon and used the dimensions to spec out a cover for it. I realize a few things: 1) the one on Haruko's guitar is probably sunk in by at least a centimeter, if not more, and 2) you really can get anything on Amazon.
I'm going to try this design for now. I'll print it in blue, print a new handle in orange-red, and paint the motor with yellow to get an authentic looking pull mechanism. I can probably have it trigger a small speaker to play a noise when pulled, but first things first...I don't have anywhere I can really mount this at the moment. The back of my blue Fender Strat (also homemade) already contains an Arduino mod. So I'm really just designing this for fun, and for future additions to this costume.
Once the bracelet is finaled, I'm going to see what it would take to cast it or have it machined. But I still have a lot of costume to finish, so it's time to start digging around the internet for the missing pieces.
The tough part here was there there's no obvious seam in the shots and artwork where she's wearing the cuff. It's snug around her wrist, so it has to be just big enough for her to get her hand through, yet small enough to fit well. I'll have to design a pull-on cuff for accuracy, though my hands are pretty big, so I may have to do some hidden trickery if I can't get a pull-on cuff to be accurate enough.
The cuff is also not super wide on her forearm, just a little more than her entire wrist joint, and is made up of three sections: two symmetrical outer segments that pancake a middle section with a smaller outer diameter and three extrudes sections. The lines between those sections appear to be painted black. Looking at the artwork, there are holes drilled around the outer sections that appear chamfered, and we only ever see two of these at a time in shots or in artwork. They appear to be about a third of the size of the outer sections, in terms of diameter. With that logic, I think there are probably four holes drilled around each outer section. The thickness is about a centimeter, maybe more, and it's lined with what looks like red fabric. The chain link, when flat, sits off the cuff just a bit, and can move freely where it's connected. It also appears to have a taper, but if you look at the artwork you realize that's all just exaggerated perspective.
The first thing I did was sit down in Fusion 360 and mock up a quick design. I like using Fusion for these sorts of things because you can edit user parameters and change them later on the fly, so it'll be easy for me to tweak measurements on the cuff as I prototype it.
Once I had something I liked, I exported and STL and sent it to the printer. I was doing some additional work and noticed that it was printing way larger than I had intended - ack! I quickly made some adjustments, kicked off a new print, and went to bed. In the morning, I work up to this!
It's a nice first prototype, but there are few things I definitely need to fix. It's still way too big, and much too wide. Thankfully because I set up my parameters nicely in Fusion, with about five minutes worth of work I had a new version that I could print.
This version was much more what I was looking for size wise, but I can go a tiny bit smaller on the inner diameter. It still hangs pretty loosely off my arm, which I definitely don't want, so I may have to revisit my methods. Also, the link isn't moving freely, so I need to fix that, but it's super close. I will re-print it tonight.
I also wanted to use Fusion for the bass guitar motor. The motor that's on the back of Haruko's bass looks very similar to a lawnmower pull starter, so I grabbed one off of Amazon and used the dimensions to spec out a cover for it. I realize a few things: 1) the one on Haruko's guitar is probably sunk in by at least a centimeter, if not more, and 2) you really can get anything on Amazon.
Once the bracelet is finaled, I'm going to see what it would take to cast it or have it machined. But I still have a lot of costume to finish, so it's time to start digging around the internet for the missing pieces.
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