Belt drive conversion for 1/10 Adaptable Chassis (w/optional cooling fan)

cults3d

This is a belt drive conversion for the 1/10 chassis created by Duke Doks: https://cults3d.com/en/3d-model/game/casis-1-10-adaptable It will allows you to replace the plastic gearing setup with a pair of GT2 pulleys and a belt. https://www.youtube.com/watch?v=JLtfAw20FHk Some of the advantages of this are: - Noise reduction. Very quiet when running, especially compared to plastic gears meshing. Very little perceptible noise. - Long life. No need to worry about gears wearing against each other or risking them fusing due to heat build-up. - Various sizes of gear and belt lengths are available, allowing you to custom match for your own gear ratios. The rear drive shaft requires pulleys with a 12mm bore, and the motor (At least in my case) is approx a 3.1mm bore. You'll also need a pair of slim M3 nuts (Under 2.5mm tall) and 2 M3x25 bolt to attach the wheels to the new drive shaft. I've experimented a little bit with various gear sizes and I recommend a 20T/60T pair with a 180mm belt to start with if you just want to get up and running. Here's some example videos, listen with the sound on to hear how quiet it runs; 60T/20T: https://youtu.be/lQ09TutLLd4 30T/20T: https://youtu.be/gU9QkKt2PCw If your motor has 4 mount holes on the front you have a centre to centre range for the pulleys of 45mm – 53mm roughly, slightly less if a single pair. Remember to take into account the outer diameter of the pulleys as well when choosing your ratio and belt. You can use the following calculator to determine if your chosen pulleys and belt sizes will work in this range. Input the 2 sizes, the belt length and the centre distance will be listed at the very bottom: https://www.technobotsonline.com/timing-pulley-distance-between-centres-calculator.html The pulleys and gears are pretty cheap. This is two eBay sources I've used for mine: https://www.ebay.co.uk/itm/283138769685?ssPageName=STRK%3AMEBIDX%3AIT&var=585193856100&_trksid=p2060353.m2749.l2649 https://www.ebay.co.uk/itm/152626326388?ssPageName=STRK%3AMEBIDX%3AIT&var=452105864004&_trksid=p2060353.m2749.l2649 Update 21/3/22: Added a revised Fan mount. Removed braces and replaced with a single double width brace Update 20/3/22: Added a variant of the rear axle - Pulley_Axle_Insert.stl This has a small square recess on the underside that a slip of metal, roughly 6x22x1, can fit into. This gives a hard surface to tighten the grub screws from the driveshaft pulley to without going into the plastic. You can find brass strips on eBay around this width and thickness. Update 15/3/22: Added a mount (Fan_Mount.stl) for the 3 brace setup to attach a 40mm fan for cooling the motor. I used a Noctua fan and pulled the power for it from an unused slot on my receiver. Update 10/3/22: Added two new side mounts (3Brace_Left and 3Brace_Right) for an optional triple brace setup.