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  1. Dogu-ya

    AT-One electric inline skates (quick update Dec 2020)

    Hi Vanarian, Been so long, I stopped working on this project for awhile. My 2 way clutch works fine during testing but it was a nightmare getting it to work under load. Obviously 3d printed parts would not stand much force, so I had a prototype made in mild steel and it was very hard to get it...
  2. Dogu-ya

    AT-One electric inline skates (quick update Dec 2020)

    Small update, Got my old 3d printer out to make some prototypes. Getting the printer repaired, set up and calibrated and printed parts to fit with each other took almost all my time till now. Starting to print a few clutch designs I have for a proof of concept.
  3. Dogu-ya

    Question about coaster brake design

    Hi guys, I have a question regarding one component in coaster brakes, the clutch spring. Also known as retarder spring, clutch tensioner, etc. I've been reading H.P Townsend's coaster brake patent and in it, he describes his clutch spring, M as providing resistance needed for relative rotation...
  4. Dogu-ya

    AT-One electric inline skates (quick update Dec 2020)

    Only RWD or FWD, depends on how it feels when accelerating, that will be a later stage. Currently working with RWD design, just because it seems conventional. The clutch allows for freewheeling both forwards and backwards.
  5. Dogu-ya

    AT-One electric inline skates (quick update Dec 2020)

    I'm impressed by these little bldc motors, they put out a lot of horsepower for their miniature size. https://grabcad.com/library/5065-bldc-outrunner-motor-1
  6. Dogu-ya

    AT-One electric inline skates (quick update Dec 2020)

    I'll be fabricating a frame for larger wheels. I skate slalom so the idea of losing the middle wheels is daunting too since I'm only on my middle wheels most of the time. I'm betting 2 outer wheels only has horrible maneuverability. Can't help it though, since I'm going the old fashioned...
  7. Dogu-ya

    AT-One electric inline skates (quick update Dec 2020)

    I'll start with a basic ESC, read a lot of horror stories about VESCs and FOC mode blowing up because of bad parameterising. I modelled the skate frame I have (minus all the fancy geometry), gained a slight appreciation for the considerations that go into the skate frame and wheels. Skate...
  8. Dogu-ya

    AT-One electric inline skates (quick update Dec 2020)

    Oddly, or maybe not so unexpectedly after all, the size of a 20Nm assembly is really close to that of a 40Nm. I'm thinking my design is just not up to snuff, ratchet and pawls or trapped roller clutches are not good at small scale, I might look into sprags. Back to the drawing board. That's...
  9. Dogu-ya

    AT-One electric inline skates (quick update Dec 2020)

    Not sure if I should start my own post or hijack this one(?) Seems most inline skate discussions happen here. I am done drafting my "small-scale" 2 way clutch, Inventor is telling me it will fail at ~3Nm, which is bad... A few short calculations imply that torque needed is 7.5 ~ 15Nm. Probably...
  10. Dogu-ya

    AT-One electric inline skates (quick update Dec 2020)

    It's the beginning, previously I've messed with high powered lasers, 3d printing, high voltage generators, robotics, etc. Too many hobbies, too little time. Friction drive is quick and dirty, I've played around with the idea for a while but decided it wasn't ideal. I realise hub motors have...
  11. Dogu-ya

    AT-One electric inline skates (quick update Dec 2020)

    Hi new to this forum, been a long time stalker of this thread. I've also wanted to design and build my own electric inlines for a long time, I am finally determined to start. Been procrastinating by going to the army for 2 years, going to university, getting a job for 3 years as an engineer...
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