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    Knocking noise from geared grunt hub motor

    Bought a geared front hub motor from China and got it spinning using this controller. As the no load speed increases (I haven't put it on a rim yet) there is a mechanical knocking noise coming from it (at lower RPMs it turns smoothly). The vendor claims I'm using the wrong controller. Has...
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    AGEING

    If you could live life backwards: You start out dead and get that out of the way. Then you wake up in an old age home feeling better every day. Then you get kicked out for being too healthy. Enjoy your retirement and collect your pension. Then when you start work, you get a gold watch on your...
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    Hydrogen Explosion at Japanese Nuclear Plant!

    Not wishing to detract from the heroic efforts of the workers at the plant, but it seems more like a farce to me. Why did they have the backup generators in a place where they could be flooded? If there was more openness then surely someone could have pointed out the risk in that? How come...
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    AGEING

    'We will be able to live to 1,000' By Dr Aubrey de Grey
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    The Most Prophetic warning of our time?

    That's exactly the fatalistic feudal attitude which the Enlightenment fought to overcome by placing man at the centre of the world. Worryingly it's this misanthropic environmentalist/climate alarmist fear which the political elite are promoting as a way of securing a last vestige of authority.
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    Needed...endless sphere trick questions for registration

    Direct potential new members to a short essay on ebike/elecrtical basics. Then set a short comprehension test. Maybe 3 questions.
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    The futility of the Prius and the end of the world …

    You wrote This makes no sense in the context of the rest of your post. Surely you meant to say
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    The futility of the Prius and the end of the world …

    Think the Earth is finite? Think again The more the merrier as far as I'm concerned. ps. I drive an ev because I'd prefer to live in a city with cleaner air where we don't have to wipe up black dust in our houses.
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    Put the Knife Down

    This thread reminds me of a Brendan Behan quote above the bar in a local pub - "I have never seen a situation so dismal that a policeman couldn't make it worse."
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    the importance of heating/cooling your batteries

    There was a video posted recently of a guy giving a lecture on lithium ion cell chemistry, can't find it atm. IIRC he said that 50degC was the temp at which the organic solvent in the cells starts to degrade. My headways get up to 35degC after a half hour run at 25degC ambient and I haven't...
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    8 kWh Battery pack advice

    I'm not you sure you want to be sitting on top of 144 - 180V DC with the possibility of melting snow in the equation. This is one application where I'd want to keep the system voltage at ~50V max and gear to that.
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    Currie / Tongxin Geared Hub repair

    There may be some useful info in this thread about a similar toothless planetary gear hub motor called a TARN.
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    General Discussion "allowable" topics

    EDIT: Refined proposal: 1. Rename 'The Cesspool' to 'Everything Else'. 2. Move 'General Discussion' into this section. 3. Rename 'Other Toxic Discussions' to 'Potentially Offensive Topics' and keep the caveat 'WARNING: This area may contain offensive posts or controversial topics.' 4. Make...
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    General Discussion "allowable" topics

    I voted other. The problem is partly one of structure. Placing 'General Discussion' near the top of the forum list gives it too much prominence. I enjoy reading off topic (ie. non EV) stuff and agree that it helps build the community. I can fully understand Bob taking offence to his thread...
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    Have you heard this...it's really old

    There was a young woman from Bude, Who went for a swim in the lake, When a man in a punt, Put his pole in her ear, And said: "Oi, you can't swim 'ere, it's private!"
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    Can I solder directly to Headway 38120 cells?

    I soldered directly onto Headway 38120L cells to make four 5p4s packs each of which is the same size as a single 38AH Greesaver SLA batt. I couldn't use the screw terminal 'S' cells because the batt boxes in my moped weren't big enough. I've got over 1500km on my cells and they show no sign of...
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    TOOLS FOR BIKE BUILDERS

    Excellent work valy, keep posting please. I'd like to see if you can get better results with the bender with thicker walled pipe, if/when you get round to it. Do you have any details about that pump, where to buy, seems to have a decent flow rate and draws well from a shallow reservoir. Cheers.
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    Working in a robotics lab

    Hmmm, ipad..........polished turd, very apt. :lol: It is precisely the law of supply and demand which ensures that on average the value of a thing reflects the amount of socially necessary labour power required to make it. When demand outstrips supply commodities sell for greater than their...
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    Working in a robotics lab

    Congrats on your new post, glad to see someone working on replicating the action of tendons. This is my favourite bit of robotics kit. -KxjVlaLBmk Fully automated CF layup anyone? Mclaren F1s for everyone? Shouldn't be too long before the manufacture of anything is affordable, if the cost of a...
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    How would you evaluate these batteries?

    At least 3C for a 20Ah pack should give decent cycle life, assuming you have a good BMS.
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    No luck soldering aluminum cell tabs. What am I doing wrong?

    I'd forget about soldering the tabs and buy some clips like these. Fold the tabs together and slip some clips over them. Cover in kapton tape. Job done. :D EDIT: Balance wires can be soldered to a thin strip of copper which the tabs are then folded on to. It maybe a good idea to put the kapton...
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    How would you evaluate these batteries?

    Erm?....check the specs for real a123 26650 cells?...
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    Even Newer 4 to 24-cell Battery Management System (BMS)

    Answer in 'Resources & EV Related Parts' section.
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    Throttles, connectors, accessories, - Where to buy them?

    JST-XH 8s (9 wire) connector cable/pigtail for Celllog from hobbydream and in their ebay shop.
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    !@#$@!# connectors!

    5pcs 6 pin JST-XH male connector #24AWG silicone wire 20cm Price： usd$1.66 5pcs 6 pin JST-XH female connector #24AWG silicone wire 20cm Price： usd$1.72
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