As I’m getting the hang of using a 3D printer, I’ve decided to start creating an original robot.
Completion Image
- The project involves making a four-legged spider-type robot.
- The goal is to achieve something akin to Tachikoma from “Ghost in the Shell,” but the primary aim is to establish the basics.
- I intend to make it autonomously mobile by equipping it with distance sensors, among other things. Eventually, I want to implement features that support human life.
- The image is as per the video below.
Configuration Diagram
I’m planning to decide on the features as I build, but for now, the goal is to make it walk around a room without hitting obstacles.
- The size will be about small enough to fit on a palm, roughly 150mm x 150mm.
- The entire casing will be made with a 3D printer.
- Eight servo motors are used in total, two for each leg.
- For the microcontroller, a Raspberry Pi Pico is applied.
![](https://shimaharu-lab.com/wp-content/uploads/2024/01/E382B9E382AFE383AAE383BCE383B3E382B7E383A7E38383E38388202024-01-0620231430.png)
Design of the Chassis
I’ve started with the legs.
I designed three parts in Fusion360: the tip of the leg, the leg itself, and the connection to the main body.
Though I say three parts, the leg and the body connection are designed as a common component, so in reality, there are only two distinct designs.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhu-ttF43WFs33CS02xeAE9zJQH3TfI4Cgp59JVCFmE6jxiRWXyGgVMwL3-yngAXlABFa7WcSp76gUDOWbkNq68_PWNuztbAz9sz0xA3D6pJyzLf0OJlTOzEtwTwdkjLxkAudxwM_USYs6udBCKYFNsOfZlnpqx_AJzfdaeTR0vEpvhCUNFzNy5e2s3k5Q/s320/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88%202024-01-06%20233232.png)
I’ve incorporated the following servo and horn, with thanks to the creator. I plan to use a servo called MS18.
![](https://booth.pximg.net/c/620x620/0fcb1d0a-e10d-47cb-8be9-185fb5163da4/i/5069331/d8623ceb-a935-49f4-8753-5f67c8e69dcf_base_resized.jpg)
I’ve also started on the body, and it’s in the picture, but I’ve managed to print it with the 3D printer.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpWdouNBzNNx25-266-L8pL8A1FtV0NgSnE1X21sjH06Kh5ATEsKW1U-nssgYVUUQxrvQHzsRTciNm6AxVHjEaQXagkZHIXzUxxxOJjfbxD-okFmi65yNzvCKi9vC8romjUn53kMta3gSHuZng1D9MJvWMAkiX75LBAnii4sII4K0tLtEWQx68-GemXZY/s320/IMG20240106234354.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3QSh1frdtj8Um_mrH8qF5DtygdUjppyybzKffEdbia2SpVnAmZHojrYG_JbHt7J844hEGn80v5A3uSHjAHP91QfSuYbCYirPxRd9kJ5pJikneZSyya9Rjr0Rl4VKXYXxM7B4ONMfq1NuZJI0T54WK2SVq9XFSxLbGhUUal_9NmoU_6v6nObly__pdxfM/s320/IMG20240106234408.jpg)
Next, I guess I’ll move on to circuit design and get the legs moving.
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