For a long time I have wanted to build an RC car completely from scratch, but never quite had access to all of the tools required to do it by hand or been able to justify the cost of using rapid prototyping methods. After taking part in the Intel IOT Invitational and the Mediatek Linkit One challenge I found myself with a whole bunch of Amazon and Shapeways vouchers, so I decided it was time to make the dream a reality.
The goal of this instructable is twofold, for anyone who wants to replicate my project exactly, I will provide all of the files (including editable models) and instructions to do it, but more interestingly, I will try and explain my choices and processes so that anyone can take what I have learned and use it to build their very own one-of-a-kind RC car, based on mine, or straight out of their own imagination.
The first step when starting a project like this is to determine your goals and your limitations, these were mine, yours may be different.
Cost: I wanted to spend as little as possible (some further notes on that below)
Time: I wanted to get it done in 80 days for the 3D printing competition, this was a great motivation to keep working hard on it. The 3D modelling was by far the most time consuming.
Available Tools: No metal working facilities, hence why I chose laser cutting and carefully designed around having to do anything other than drilling and tapping afterwards.
Available Software: I am familiar with Solid Works, but now that Autodesk Fusion 360 is available free to hobbiests I used this as a project to learn on. I can't recommend it enough!
Potential Cost Reductions
I was fortunate enough to be able to fund almost the whole project with vouchers I won from various Instructables competitions, but this means that my choices would not universally be the cheapest options, here are some ideas if cash is tight.
The vast majority of the parts can be swapped out with alternatives that you probably already have if you are into RC.
|Part||Link to Supplier||Supplier||Cost (USD)|
|Front Axle||Aluminum 1:14 Tractor Axle||Asiatees||21.5|
|Rear Axle||Boom Racing SCX10 Axle||Asiatees||98|
|Driveshaft||Hardened Steel Adjustable Shaft||Asiatees||20.9|
|Gearbox||Alloy SCX10 Case ||Asiatees||21|
|Gears||Boom Racing Heavy Duty Gears||Asiatees||24|
|Wheels (Front)||75mm Wheel and Tyre|
|Wheels (Rear)||KRT 108MM Wheel and Tyre||Asiatees||13|
|Motor||7.5T Brushless Sensored Motor||Asiatees||57|
|Shocks||65mm Aluminium Shocks||Aliexpress||16|
|Servo||1:10th Scale Servo||Hobby King||15|