Over the summer a friend
was selling some of his unused combat robot parts and I bought one of his hubmotor disks from one of his old robots. I bought the disk before I had any real plans for building a robot to use it. I originally wanted to do a vertical spinner like the robot it used to be in
, but with the disk at 6" dia the robot would have had to be comically large to have any stability. I thought about it some more and decided to do a horizontal spinner. After looking at many other horizontal spinners
i settled on the fairly generic design that many horizontal spinners share. Which is a semi triangular shape with weapon at the front and wheels at the back.
Now that I had the weapon and general design of the robot I could begin work on designing everything else. I first determined what components I wanted to use. I went with two Fingertech TinyESC's
and 1000rpm motors
with 2 1/4" wheels for drive because the combination is fast enough for a weaponed robot. I decided to run the robot at 3s or 11.1 v because I already had 3s lipo batteries and a charger left over from another project.
To actually design the robot I used Autodesk Inventor. I first modeled out the area needed by each robot component and then figured out how small I could make the robot and still fit everything. The other challenge was keeping it under weight. Designing it in a CAD program made everything easier than the other design method I use which is to physically lay out each component and then draw an outline on cardboard.