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  1. J

    Metal 3D Printed RC Friction Drive - Development / Build Log

    Have you seen this system: http://www.instructables.com/id/Bicycle-BoosterPack-a-3D-Printed-Portable-Electric/ Sounds like what you are describing. I decided to do my own design as the parts count for that setup seemed overly complicated (over 20 3d printed parts, vs my 3 parts). Also, it...
  2. J

    Metal 3D Printed RC Friction Drive - Development / Build Log

    I had assumed my plastic design wouldn't hold up to the abuses of daily use, so I had planned on using my prototype until it failed and then doing any re-design needed and then getting it printed in metal. However, the plastic version is holding up great and the weight is very minimal (not sure...
  3. J

    Metal 3D Printed RC Friction Drive - Development / Build Log

    It's actually holding up great and has made me put off buying a VESC, since the VESC would cost more than my entire build. Someone who weighed about 200 lbs was doing some repeated runs up a steep road on my bike, and afterwards I checked the temp of the motor and it was extremely hot (close to...
  4. J

    Metal 3D Printed RC Friction Drive - Development / Build Log

    Yeah, with my latest design I'm getting zero slippage which is great, even up steep hills. I think this rotational design is good because the more resistance you put into the tire the more the motor rides up it and really digs into the tire. Previously I was thinking of gluing a tube around the...
  5. J

    Direct driving the chainring with an R/C Motor

    Hey Amberwolf, Since I was new to the electronics side of things and R/C motors in general I decided to start with a friction drive after reading the lengthy Kepler thread. Last weekend I spent a lot of time designing and refining the design and it's working really well so far. I created a...
  6. J

    Metal 3D Printed RC Friction Drive - Development / Build Log

    I spent the weekend updating and refining the 3d printed design. The main issue is packaging as there is so little space where I'm mounting it, yet I need the parts very thick to make them stiff enough in plastic. After printing out 4 different designs I finally have something compact enough to...
  7. J

    Metal 3D Printed RC Friction Drive - Development / Build Log

    Spent a few hours designing Prototype 2 which will be printed in plastic via FDM. Here's an image of the design so far, if anyone is interested I can write up some more details and attach some other pics. Any input is welcome.
  8. J

    Metal 3D Printed RC Friction Drive - Development / Build Log

    Some updates on my build: I soldered some bullet connectors to the motor and ESC, as well as an XT60 connector to the ESC. Tested the motor out on both 3S and 6S, and the motor has some serious power on 6S. I laser-cut a simple bracket so that I could have a very early prototype (I call it...
  9. J

    Metal 3D Printed RC Friction Drive - Development / Build Log

    New parts have arrived! 1) KEDA 56-63 195KV Brushless Outrunner ($40) 2) 70A ESC ($20) 3) Another 2.2Ah 3S Lipo along with a Y-cable to connect both in series ($11 per battery) I put them on the scale to get an idea of the weight. For the main components I'm under 1KG which is great. Main...
  10. J

    Metal 3D Printed RC Friction Drive - Development / Build Log

    It's funny you should mention driving the rim directly, as I also thought of some alternatives to the standard friction drive. My first thought was to drive the chain/chainring directly but some quick math dictated a gearbox which would add a lot of weight. Then I thought of taking advantage of...
  11. J

    Metal 3D Printed RC Friction Drive - Development / Build Log

    I don't have any direct access to metal 3d printers, but I could ask for favors to maybe get it printed for free. However, in the past I've just used print service companies to get parts for personal projects. I plan to do all prototyping on my FDM printers (Type A Machines, Series 1) and...
  12. J

    Metal 3D Printed RC Friction Drive - Development / Build Log

    To gain some confidence on the electronics side of things, I ordered a cheap 2204 brushless motor, lipo battery, 20A esc, and a servo tester. I really suck at soldering but managed to get everything wired up and the servo tester worked great to control the ESC. I won't be using this motor/esc on...
  13. J

    Metal 3D Printed RC Friction Drive - Development / Build Log

    Hi All, I'm planning to build a friction drive system for my hardtail commuter bike and figured it might be good to document the process here. I am very new to the RC scene and have little experience with electronics, so it will be a learning process for me. However, I have a lot of experience...
  14. J

    Direct driving the chainring with an R/C Motor

    That's a nice motor! A little expensive for me though. It looks like they make some 110kv motors, but with a beastly 80mm diameter.
  15. J

    Direct driving the chainring with an R/C Motor

    Actually, I really did mean 3d printed (I work as an engineer in a related field to 3d printing). The 3d printed metal parts are quite strong (slightly higher than cast parts, but lower than forged). I've used several 3d printed stainless steel metal parts on my bikes and they held up to years...
  16. J

    Direct driving the chainring with an R/C Motor

    Thanks amberwolf. I do plan on running some sort of reduction gearbox, just haven't figured out what exactly. The 3d printed parts will be printed in stainless steel so wear shouldn't be too much of an issue. I did find some threads that have been interesting (especially the cycloidal gearbox...
  17. J

    Direct driving the chainring with an R/C Motor

    I'm thinking about creating an ultralight e-bike with an R/C motor that sits right behind the bottom bracket and has a custom 3d printed gear (shaped like a chain) that drives the front chainring in a 1x hardtail. It would be driving the chainring on the back side where the chain is not wrapped...
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