Machining some lock rings

 

Big Kart New Beginnings

After brining it to the BD car show in 2022 and remembering what a blast it was to drive, I got interested in working on the Big Kart again.  It's getting new everything, starting with drive units based on the newer Ioniq hybrid HSG.  Real blog post when I've made more hardware progress, but for now enjoy this picture of some 3d-printed aluminum motor housings with internal water cooling channels. All the way on the left is the stock housing.

Press Tool Trick

Picked up from a technician at work who'd pressed many a bearing:  Put a magnet in the back side of the press tool so it sticks to the bottom of the arbor press ram

Tool sticks to the ram and automatically squares itself!  No need for 3 hands to hold the part, the press tool, and the arbor press lever:

Installing some new bearings in a bike wheel front hub:

Finally some lathe tool organization

3d printed dovetails - the AXA sized holders are just big enough to fit two screws into a 20x40mm aluminm t-slot extrusion:

 

Hopper Stabilization Hardware Progress

 More little drone motors, flywheels, and motor drive mounting brackets:

New MJF printed structure to hold everything:

This is almost everything, shooting for 1kg total when it's done, not much left for the protective shells, foot, and control PCB.

A hilarious situation

There will be a proper blog post

 

Balancing Leg

It balances!

The inertia changes significantly as the "body" moves up and down the leg - for the controller, I got feedback gains with LQR for the maximum and minimum extension cases, and linearly interpolate between those gains as the leg extends.

Leg + reaction wheel doing stuff

Running off a bench supply and offboard micro, controlling with a joystick.  There's an IMU attached too, so hopefully soon it'll be doing some 1-DOF balancing:

New capacitor for Yottacoil

Another CPW, another round of tesla coiling.  Last time the primary capacitor caught on fire, so I helped Michael and Austin cobble together a new one out of the Eurofarad caps the coil originally used.  I designed some bus bars and MITERS undergrads got them waterjet cut for us.

216 M6 socket head cap screws and 36 crimps later:

Successfully ran 2 evenings with 0 capacitor fires and 1 boost converter fire:

Reaction wheel motor assembly

Dovetail Vise Fixtures

Reaction wheel assembly

Still needs a motor, of course, but it's taking shape

Someone asked what the step on the inside of the reaction wheel was for:

Reaction Wheel Mount Op 1, Pulley Weight Reduction

 

Reaction Wheel

Back to making shiny things