On the 27th of February 2025, 5 days after BBB Brawl, an idea would form, and over the course of the following 5 and a half months, it would take form.
Introducing Corruption!
And I know what you are thinking, why hasn’t this log been made till now?
A simple reason. I wanted to keep this build relatively secret.
So let’s start from the beginning.
With a pile of old parts lying around, I placed them together to see what ideas would form. Rather quickly, the idea formed a 4-wheeled bot with small front wheels and big back wheels driven with my old 22mm brushless converted gearmotors and the drive belts from Data Breach MK1-MK2.
Old drive motors, wheel hubs and mounts all went into the build with mods/ upgrades needed.
Over the whole of March, I worked on the CAD. At first, I wanted to reuse Data Breach’s retired axe module, but I also explored a lifter design. I was happy with the drive design, but the weapons just weren’t working for me.
Near the end of March, I settled on a different direction. After years of wanting to give spinners a shot, I figured, why not now? This was an early version of the CAD. The design went through a few changes as I prototyped the design with 3D printed mockups.
While prototyping, I got the aluminium hubs modded. I chopped off the old C clip ends, and I then tapped the ends to take M5 bolts that’ll retain the wheels on the hubs.
The first tpu wheel and the weapon pulley test fitted. The pulley is fitted over a Flash Hobby D-series brushless motor. The inside of the pulley has been designed to interlock with the motor can. The bolts were simply to keep the pulley in place.
I quickly got to the point of printing the first of the TPU wrap-around armour.
The prototype chassis with electronics fitted. At this point, the weapon area was revised based on helpful feedback from Ari. I also got the 10mm diameter silver steel rod that’ll become the dead shaft for the weapon. I drilled it hollow before tapping it to take M6 bolts on either side.
In April, I realised a rather glaring issue with the design that was important to change. The back of the robot was made up of 3 sections, with the middle being a TPU part that doubled as the motor mount. Hindsight makes us fools of us all 
I quickly changed to a single-part back panel made from HDPE, like the rest of the chassis.
The wire loom was divided between both sides of the bot. The left side housed the FT switch, left drive motor and the battery, while the right side housed the right drive motor, main wire loom, fuse, LED and all the ESCs. The drive ESCs were two BBB brushless ESCs, and the weapon ESC was the Repeat Robotics Vortex 80A ESC. You can also see the weapon motor mounted in the middle while being supported on both ends.
The Hardox parts arrived: 6mm disks and forks with 3mm wedges for the anti-HS setup.
Test-fitted to the prototype assembly. The disks are roughly 96mm in diameter.
Learning from my mistakes from 2023, I upgraded my conversions to have a brass spacer to stop the motor can shifting.
2 of the 4 brushless gear motors ready for action. Around this time, Corruption was signed up for Capital Punishment.
Originally, I planned to have an aluminium hub for the weapon, but I was convinced to try a TPU hub with embedded spacers to save money on machining.
The whole weapon assembled weighs 360g, including bearings, spacers, M6 x 16mm bolts, TPU hub and disks. I went with M6 bolts cause I had a huge supply of them from my FW builds.
Test fitted to the bot with the newly bought belts. Originally, the weapon was going to be a 1:1 ratio, but the slightly larger hub made it 1.33333:1. In the end, the weapon would have a tip speed of 196mph.
Time to cut out the HDPE! Lots of pockets were designed to save weight, which would be needed as Corruption was pushing close to the weight limit.
To aid in the weight saving, I ground the ring gears of the gearboxes into the squares; they are not perfect, but they’ll do their job.
With parts machined and the gearboxes reassembled and regreased, it was time to start the assembly.
The 3mm base and spare were quickly made 2 days later, with some weight-saving slots added.
Originally, I wanted the weapon motor to be mounted with Aluminium mounts, but weight was too tight, 8mm HDPE to the rescue.
Weight check. Not much weight to play with and a little too close for comfort.
As always, I take what I’ve learnt from the build to set up changes for the next version. One of those changes was a lighter and smaller battery. Pulling the trigger for this build, I got 2 3s 850mah LiHv lipos, the loss of 150mah was worth the 30 grams saved. And the tasty sweet was also nice.
Side by side, the 1000mAh battery borrowed from Data breach. such a size and weight difference.
Making the last of the spares.
And with that, Corruption was ready for Capital Punishment. I’ll write up the event report in a day or two. Typing is hard.
