As seen in my last post there were a few issues with my open RC build that needed resolving. The first was the front wheel axle snapping. I have since printed a whole collection of front axles with 100 % infill (solid). This makes them much stronger than when they were only 20%. As I printed a whole bunch I have spares at the ready if I need them.
The next thing to look at was the steering. Here I was having issues with the servo not centering the wheels with no input. This indicated there were binding issues but it seems the servo may have also been at fault. While playing with the trim settings on the transmitter the servo went crazy and melted itself. There was a lot of smoke coming out so I quickly ripped out the Lipo battery and took the car outside. The house stunk of burnt electronics.
The offending item was removed and remarkably caused no warping to the PLA chassis.
I fitted a new servo and adjusted how the servo linkage worked to make the wire straighter.
I also used a multitool to sand down the inside of the car body so that the servo rod no longer snagged on it. Lastly I added a washer between the servo saver and lower chassis.
These things combined have fixed the steering issues I was having. The steering now centers itself and responds a lot better than before.
I have been having a lot of fun printing TPU tyres at different settings and have made some progress with regards to producing tyres with more grip.
That said the TPU tyres always lacked the grip of a rubber tyre so I caved in and brought some Tamiya tyres. I will go back to TPU when making a heavy vehicle as part of the problem is that the f1 car is so light the tyres are not creating much friction with the ground.
The Tamiya tyres. I had no idea that these came in different compounds so I ended up with super soft rear tyres and standard front ones.
New rims had to be printed for the Tamiya tyres and the wheel ends up a bit bigger than the printed tyre version. You can see that the rear tyre almost touches the bargeboard. This is good as it increases ground clearance a little which should lead to less damage when driving over uneven terrain.
I have only tested the Tamiya tyres indoors at the moment on wooden floor but I can already tell they perform miles better than the TPU tyres. I did make a second video however of my second generation TPU tyres at the weekend. These were a step up from my previous attempt which were much too hard. These are printed at 10%. I still have not had much success with printing them at 5% at all.
Next time with the rubber tyres the lack of grip should be a thing of the past!