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    kWeld - "Next level" DIY battery spot welder

    Hi, I bought a kWeld last year with 4 of those big super caps which Frank was selling separately. I got around 1150A which for steel is enough but i have problems with 0.2 nickel and most of the time only one spot of the two is sticking. I make 3 pairs of spots weld but i am using it for...
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    Yamaha Pw custom controller + battery

    Hi uiui85, I didn't bought that bike in the end, I started making my own ebikes. If you want a good controller just use a Vesc. I think the torque sensor can also be adapted with a little tinkering.
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    My RC Mid Drive with Single Stage Reduction

    I have no ideea how you achieve such high powers.. [75 phase amps] .. even if i set it to 50 amps it feels inefficient and rough, probably because of small 10t sprocket. I set it to 30 amps and it feels good and smooth enough. I've never seen more than ~350W on VESC app, with 30A battery...
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    My RC Mid Drive with Single Stage Reduction

    Why worry ? just set the MOSFET temperature start and limit values and power will be gradually reduced from start to end limit tempeature. I would say 60C to 70C is pretty safe. That's an interesting point because for me this motor had a more satisfying 'brushless' sound with a characteristic...
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    My RC Mid Drive with Single Stage Reduction

    Unfortunately i don't have access to a dynamometric stand, but i feel that it has a little more torque at same phase amps than turnigy d5035. I guess it can't be that bad then. What's more to like about this motor is that it runs cooler than D5035. I remember that turnigy was warming up easily...
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    My RC Mid Drive with Single Stage Reduction

    Hi Balor I managed to measure the no load current of this chinese 6384. At 14.5v supply i got 0.8A current consumption. I still think this motor beats everything in this price range. It has enough torque, sounds good and is cheap. Wouldn't go back to turnigy in this setup. FZBob Did you get...
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    My RC Mid Drive with Single Stage Reduction

    Hi BalorNG, Sorry for late reply, but i left my bike in my work town and now i'm home, so it will be a few weeks until i get back.
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    My RC Mid Drive with Single Stage Reduction

    No keyway -> D-shaped shaft. I have 3 grub screws holding on it. No problems until now. I will put at least a clamp meter on the wires and check for current. Im not sure about this one, you mean the 3 coil resistance of the stator ?
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    My RC Mid Drive with Single Stage Reduction

    I was playing with it on VESC application and with a 14v power supply it was showing a power of ~3w. I didn't hook up a power meter but 1.5A seems too much for no load current. Maybe you were using more input volts, i'm not sure. I see metal chips sticking to the rotor, but Turnigy was also...
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    My RC Mid Drive with Single Stage Reduction

    And you din't even wait for my review .. may Aliexpress fulfill your wish :lol: This motor has really the biggest stator of all with the outside dimension being roughly equal to D5035. There is a catch .. the rotor is not suported on both ends of the axis as Turnigy ones.. and sometimes when...
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    My RC Mid Drive with Single Stage Reduction

    Whoah i think we are going too far with the numbers here.. this motor is just a little bit longer than D5035. I expect it to be a little more torquier but i don't think it's stronger than Turnigy 6374. It would be too good to be true at half the price of Turnigy motors. Still, i do think that...
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    My RC Mid Drive with Single Stage Reduction

    New toy time: This puppy with chinese pedigree is very close in size to the orange D5035 but it's much heavier(~+250g) and at half the price! I wonder if it's more copper in there.. I didn't test it yet cuz i had a hell of a time enlarging the 8mm ID of 11t sprocket to 10mm as this...
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    My RC Mid Drive with Single Stage Reduction

    I'm not sure if he passed the planning phase but it is sure a nice ideea. In the meantime I found this planetary which resembles to the cyclone one and looks like a though one: https://s.click.aliexpress.com/e/BWrqh4GY I think a 3d printed enclosure / motor adapter wouldn't be hard to make. It...
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    My RC Mid Drive with Single Stage Reduction

    I have the new bike, its Cannondale Habit Carbon 2 SE. Currently has 13kg but i will put it on a weight loss diet until it reaches 12kg. Maximum weight without batteries should not exceed 15kg because i have to put it on a roof rack and i'm not the strongest. We have 3kg to play with for the...
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    My RC Mid Drive with Single Stage Reduction

    Paul's drive is really slick, but I would still prefer to develop mine. I'm going today after the new bike and begin doing the CAD stuff. In simple terms 3:1 primary belt reduction and 6:1 secondary 25h chain reduction. Compact as possible. I'm aiming at around 800w. Speed doesn't really matter...
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    My RC Mid Drive with Single Stage Reduction

    Grantmac you mean the CYC x1 pro? That's a nice drive but it costs big bucks. I don't really want to spend 1k, I'd rather improve my skills at building a drive myself. The goal is to be able to climb the steepest hill without pedaling and light enough for me to lift it on a roof rack. My...
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    My RC Mid Drive with Single Stage Reduction

    You're right that gears needs lubrication and probably belt would be the most simple solution. I was struggling to find a planetary gearbox for rc motors, do you have any example? FZBob My gearing is 46t - 28t, I cannot go lower then this. I have the same problem as you, bad knees, and I'm...
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    My RC Mid Drive with Single Stage Reduction

    FZBob I have an ideea which you also had in the past. But it seems feasible to me now. What if i put another alu plate in front of the motor plate and mount 2 spur gears for a primary reduction of 3:1 (45t-15t), will a mod 1 spur gear survive ? (let's forget the freewheel for now) These are...
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    My RC Mid Drive with Single Stage Reduction

    That's a serious 2kw of power but was it first stage or second stage reduction ? If it was second stage that's really good, my only concern is that it's really rough. When the motor develops torque i feel the whole crank is vibrating like hell. What was the size of the small sprocket which you used?
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    My RC Mid Drive with Single Stage Reduction

    That box for the bike is really neat. Do they allow max 100Wh per battery or per 'luggage' ? If it's per battery then a lot of trick can be made by splitting the battery. I made some improvements for my motor bracket. The plastic was not dissipating heat and i was constantly overheating. Now...
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    My RC Mid Drive with Single Stage Reduction

    I made a shaft support with a bearing: It made a big difference in chain slackening. No more shaft flexing. The problem with the chain climbing on the big chainwheel i think it's because my motor is right above the chainwheel and the chain is tangent(vertical) to it. I saw that your motor...
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    My RC Mid Drive with Single Stage Reduction

    Today i reprinted the motor mount in PLA. Took it in my hands and it felt very stiff .. stiffer than ABS for sure. I thought to myself: Nice, i won't have any more problem with chain become slack and climbing on the chainwheel teeth. Guess what ? i was wrong.. and the culprit is (drum-roll...
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    My RC Mid Drive with Single Stage Reduction

    It's pretty good but it does have some flex to it. The corner sides of the motor plate crack because of the printing/layer orientation but it's still holding up. I will reprint the motor mount with another orientation and that should solve the problem. I could also increase the temperature...
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    My RC Mid Drive with Single Stage Reduction

    How could you set the limit so high ? If i set motor amps higher then 30A i get cogging at full load. I tried increasing battery amps but that didn't solve it(lowering it solves it, but then power decreases), the maximum motor current without cogging is 29A. At this level battery amps barely hit...
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    My RC Mid Drive with Single Stage Reduction

    It seems that wiring the motor to a star connection should eat less current at an increased voltage. Which results in less electrical losses and an increased efficiency. The FETs on the VESC will be more happier too. I was playing around with the bike on a stand and checking the current...
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