If you’ve been to the right events, you’ve seen them before – the cars with an external cage that let the car complete a somersault in the forward direction under heavy braking. They’re impressive, but it’s possible to take things even further. Enter [mastermilo82] and the RollKa.
The RollKa follows on from the RollGolf, which was a straightforward roll car build. Built around a Ford Ka, it eschews the external cage for a more radical design. The Ka has been shortened, and designed to fit within two enormous steel rims which wrap around each side of the car. Additional idler wheels have been welded to the Ka’s roof to enable it to effectively roll within the outer steel rims.
It’s a rather eccentric design, known as a diwheel. We’ve seen impressive electric versions before, but at least at this stage, this project appears to lack any advanced control systems and gets by on sheer luck and welding prowess. The build is still at an early stage, with episode three starting some early movement tests under power. It’s a testament to what can be achieved with a spacious garage and some imagination, and we can’t wait to see what happens next! Video after the break.
When working on classic vehicles, and especially when modifying them outside of their stock configurations, things can get expensive. It’s a basic principle in economics: the rarer something is the more money somebody can charge you for it. But if you’ve got the skills and the necessary equipment, you can occasionally save yourself money by custom-fabricating some parts yourself.
After changing the gear ratio in his 1971 Ford F100, [smpstech] needed to adjust his speedometer to compensate. Unfortunately, a commercial speedometer reducer and the new cables to get it hooked up to his dash would have run into the hundreds of dollars, so he decided to try designing and 3D printing his own gearbox. The resulting development process and final product are a perfect example of how even a cheap desktop 3D printer, in the hands of a capable operator, can do a lot more than print out little toy boats.
The gearbox contains a large ring gear driven by a smaller, offset, spur gear. This compact inline package drops the speed of the input shaft by 25.5%, which [smpstech] mentions is actually a bit slower than necessary, but it does give him some wiggle room if he decides to change his tire size.
Even if you’re not looking for a speedometer reducer for a nearly 50 year old truck, there are some lessons to be learned here in regards to 3D printed car parts. The first version of his gearbox, while functional initially, ended up looking like a deflated balloon after being exposed to the temperatures inside the F100’s engine bay. His cheapo PLA filament, which is probably fine for the aforementioned toy boats, simply wasn’t the right material for the job.
[smpstech] then reprinted the gadget in HTPLA, which needs to be annealed after printing to reach full strength. Usually this would involve a low-temperature bake in the oven, but he found that simmering the parts in a pot of water on the stove gave him better control over the temperature. Not only did the HTPLA version handle the under-hood conditions better, it was also strong enough that he was able to use a standard die on the connections for the speedometer cables to create the threads instead of having to model and print them. Definitely a material to keep an eye on if regular PLA isn’t cutting it for you.
OK, we haven’t heard of a Ford Cylon either. However, there is now a Mustang Cobra out there that has been given a famous Cylon characteristic. [Monta Elkins] picked himself up an aftermarket third brake light assembly, hacked it, and installed it on said Mustang.
The brake light assembly contains 12 LEDs, which unfortunately, are not individually addressable. Additionally, by the looks of it, the brake light housing was not meant to be opened up. That didn’t get [Monta] down though. There’s more than one way to skin a cat, but he chose to use a hot knife to open the assembly, which worked quite well. A rotary cutter tool was used to cut the traces between the LEDs allowing them to be individually controlled with an Arduino. A Bluetooth module allows him to control the new brake light from his smartphone. There are different modes (including a special mode that he shows off at the end of the video) that can be selected via a Bluetooth Terminal app.
There is no schematic or code link in the video itself or the description, but [Monta] did hit the high points. Therefore, it shouldn’t be too hard to replicate.
Does everyone watch a load of videos on YouTube that are somewhat on the unadmissibly geeky side? In my case I might not care to admit that I have a lot of videos featuring tractors in my timeline. The mighty Russian Kirovets hauling loads through the impossible terrain of the taiga, tiny overloaded 2WD tractors in India pulling wheelies, and JCB Fastracs tearing around the British Fenland. You can take the girl off the farm, but you can’t take the farm out of the girl.
So my recommendations have something of an agricultural flavor. Like the video below the break, a 1917 silent film promoting the Ford Model B tractor. This one was eye-catching because it was a machine I’d not seen before, a rather unusual three-wheeler design with two driving wheels at the front and a single rear steering wheel.
During the early years of the twentieth century the shape of the modern tractor was beginning to evolve, this must have been a late attempt at an alternative. Speaking from the viewpoint of someone who has operated a few tractors in her time it does not look the easiest machine to control, that cloud of exhaust smoke surrounding the driver would not be pleasant, and the operating position hanging over the implement coupling at the rear does not look particularly comfortable or safe.
The film has a charming period feel, and tells the tale of a farmer’s son who tires of the drudgery of manual farm labor, and leaves for the city. He finds a job at the tractor factory and eventually becomes a tractor salesman, along the way meeting and marrying the daughter of a satisfied customer. He returns home with his bride, and a shiny new tractor to release his father from ceaseless labor. Along the way we gain a fascinating look at agriculture on the brink of mass mechanization, as well as the inside of a tractor factory of the time with an assembly sequence in which they appear to use no fasteners.
All of this is very interesting, but the real nugget in the story lies with its manufacturer. This is a Ford Model B tractor. But it’s not a Ford Model B. Confused? So, it seems were the customers. The Ford we all know is the Michigan-based motor company of Henry Ford, who were already very much a big name in 1917. This Ford however comes from the Ford Tractor Co, of South Dakota, an enterprise set up by a shady businessman to cash in on the Ford brand, manufacturing an already outdated and inferior machine backed up by dubious claims of its capabilities.
On the staff was an engineer called Ford who lent his name to the company, but he bore no relation to Henry Ford. The company didn’t last long, collapsing soon after the date of this film, and very few of its products survived. It did have one legacy though, the awful quality of one of its tractors is reputed to have been the impetus behind the founding of the Nebraska Tractor Test Laboratory, the place where if you sell a tractor in the USA, you’ll have to have it tested to ensure it performs as it should. In their museum they house one of the few surviving Ford Model B tractors.
Meanwhile the Ford in Michigan produced their own very successful line of tractors, and their Fordson Model F from the same year is a visible ancestor of today’s machines. But as the video below shows, there’s nothing new about a fake.
In a world filled with 3D printed this and CNC machined that, it’s always nice to see someone who still does things the old-fashioned way. [Headquake137] built a radio controlled truck body (YouTube link) from wood and polystyrene using just a saw, a Dremel, a hobby knife, and a lot of patience. This is one of those builds that blurs the lines between scale model and sculpture. There aren’t too many pickup trucks one might call “iconic” but if we were to compile a list, the 6th generation Ford F-series would be on it. [Headquake137’s] model is based on a 1977 F100.
The build starts with the slab sides of the truck. The basic outline is cut into a piece of lumber which is then split with a handsaw to create a left and a right side. From there, [Headquake137’s] uses a Dremel to carve away anything that doesn’t look like a 1977 F100. He adds pieces of wood for the roof, hood, tailgate, and the rest of the major body panels. Small details like the grille and instrument panel are created with white polystyrene sheet, an easy to cut material often used by train and car modelers.
When the paint starts going on, the model really comes to life. [Headquake137] weathers the model to look like it’s seen a long life on the farm. The final part of the video covers the test drive of the truck, now mounted to a custom chassis. The chassis is designed for trails and rock crawling, so it’s no speed demon, but it sure does look the part riding trails out in the woods!
[Headquake137] managed to condense what must have been a 60 or 70 hour build down to a 14 minute video found below.
Driving a brand new 670 horsepower Roucsh stage 3 Mustang while wearing virtual reality goggles. Sounds nuts right? That’s exactly what Castrol Oil’s advertising agency came up with though. They didn’t want to just make a commercial though – they wanted to do the real thing. Enter [Adam and Glenn], the engineers who were tasked with getting data from the car into a high end gaming PC. The computer was running a custom simulation under the Unreal Engine. El Toro field provided a vast expanse of empty tarmac to drive the car without worry of hitting any real world obstacles.
The Oculus Rift was never designed to be operated inside a moving vehicle, so it presented a unique challenge for [Adam and Glenn]. Every time the car turned or spun, the Oculus’ on-board Inertial Measurement Unit (IMU) would think driver [Matt Powers] was turning his head. At one point [Matt] was trying to drive while the game engine had him sitting in the passenger seat turned sideways. The solution was to install a 9 degree of freedom IMU in the car, then subtract the movements of that IMU from the one in the Rift.
GPS data came from a Real Time Kinematic (RTK) GPS unit. Unfortunately, the GPS had a 5Hz update rate – not nearly fast enough for a car moving close to 100 MPH. The GPS was relegated to aligning the virtual and real worlds at the start of the simulation. The rest of the data came from the IMUs and the car’s own CAN bus. [Adam and Glenn] used an Arduino with a Microchip mcp2515 can bus interface to read values such as steering angle, throttle position, brake pressure, and wheel spin. The data was then passed on to the Unreal engine. The Arduino code is up on Github, though the team had to sanitize some of Ford’s proprietary CAN message data to avoid a lawsuit. It’s worth noting that [Adam and Glenn] didn’t have any support from Ford on this, they just sniffed the CAN network to determine each message ID.
The final video has the Hollywood treatment. “In game” footage has been replaced with pre-rendered sequences, which look so good we’d think the whole thing was fake, that is if we didn’t know better.
Click past the break for the final commercial and some behind the scenes footage.