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    1,000lb "Elec-tow’d” Electric Tow’d Dune Buggy Build Thread

    Just wanted to say I like this project very much, think you've done a great job with it so far and look forward to seeing it continue! I have a coworker who is building his second VW-buggy based EV now, it is a really cool platform for sure. He drives his first buggy to work often when the...
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    Toyota Prius 2008 battery upgrade

    I used to be involved with the "plug in prius" modification scene, but it has been years since that! It is certainly possible and can have good results, but has gotten less popular since there are many more plug-in cars on the market these days. The Gen 2 prius transmission can run completely...
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    ES Meetup and Project Showcase at SF Maker Faire, May 18-19

    I missed the "maker" registration deadline but I'd like to come the event and hang out if I can make it given the challenges that week in school... I will bring my crumby e-bike, or maybe something less crumby if I get it built in time... I met up with Bob Schneeveis on Thursday night and...
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    Questions for Toyota Prius owners.

    1. Not very, there are kits. Just a couple wires to the ECUs behind the glovebox. 2. Yes. "kill switch" style EV-mode is good for 52? 55? at that point the MG1 speed is at its physical limit and the car can't travel faster without spinning the ICE 3. Depends how you drive. Pack is very small...
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    Tabletop Engine Dyno *Build In Progress*

    I rather don't mind the idea of leaving some big scorch marks on the cube wall :twisted: That way my coworkers can remember me after I leave to go back to university... On the plus side setting the wall on fire means everything else is working really well, right?
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    Tabletop Engine Dyno *Build In Progress*

    That is a good way of thinking about it. I had assumed I would just run the resistive load only on this project, and there are some cases when you would want to do that... say to test an entire battery/controller system- but for most cases simply dumping back into the source battery through a...
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    Tabletop Engine Dyno *Build In Progress*

    o So Where Next? Unfortunately I start school again next week :| But I will try to continue to make some progress. It should be pretty straight-forward to get a very basic level of functionality working and get some numbers from it- I just have to try to turn off my perfectionist impulse...
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    Tabletop Engine Dyno *Build In Progress*

    And then I spent a few hours and built the resistive load: Three 28v/600w aircraft landing lightbulbs wired in Delta. This allowed me to do a real honest-to-goodness test! The results are encouraging! ZLHhCNCsB_4
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    Tabletop Engine Dyno *Build In Progress*

    I have gotten some good work in on the dyno project over my winter break- it's almost mechanically complete now! New since last time: -Motor mounting plate: This I ended up designing as a two-part system: The plate that bolts to the skid is used for any different sort of motor- the...
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    Testing the HP ESP-135 Server supply and isolation modding.

    I finally got around to doing this to some supplies and thought I'd share a couple of things based on my experience: I screwed around a bit trying to see if it made sense to attach the output leads somewhere else, like removing the "hot-swap" connector and soldering them somewhere, or...
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    bairdco racing at adams, september 15, 2012

    Thank you to everyone who came out! I had a great time meeting you/hanging out with you all. It was a great fun way to spend my birthday :) Luke's death bike totally fits into the Prius, leaving no doubt that it is a bicycle and not a motorcycle, and that the Prius is the ultimate e-race...
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    One KiloWatt 18S Bulk Charger

    I have tried to take my HLG supplies apart. The top aluminum cover plate is removable but it simply reveals a fully pour-potted assembly, there are no components protruding from the material, the side plates are fused to the sides of the potting. This also means that if you damage the...
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    CroBorg Super Commuter

    I would be curious to cut apart some test crimps made with the ebay crimper and the cheap copper collars, just you know, in the interest of seeing what happens. If you are in fact achieving cold welding inside the joint it would be a little bit of a BFD, I think. -Henry
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    Small home cnc machine advice

    Eeeeeeew why on earth did he conventional-mill the outside contour. Looks like depth-cuts of .050" with maybe a .125 tool, running a very high speed router spindle. Note the roughness of the finish on the walls of the cuts, and the typical chatter-marks in the inside corners. Once you've had...
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    Small home cnc machine advice

    Yes, that is the only way it will work. Small depth cuts reduce the rigidity required. The machine you originally posted will never cut steel, and might cut aluminum at a depth of <.02" per pass, with a small diameter, good, sharp tool. The accuracy will be mediocre and the finish on the edges...
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    One KiloWatt 18S Bulk Charger

    My 2c- I would install this in my charging system if it were set up to run at high voltage directly, I would probably get rid of the cell-by-cell monitoring and use Methods detector boards instead (or move the cell-by-cell monitoring to a daughterboard? Expandable? Optoisolated interface...
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    Small home cnc machine advice

    Feed and speed are important sure, power is good (it is not uncommon to use hobby outrunners to power a milling spindle, I know of a couple people here who do just that)... The key is rigidity, which most small machines lack. Rigidity is how much a material deflects for an amount of force put...
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    Small home cnc machine advice

    Machines like that are not nearly rigid enough for any serious machining of any metal. The frame, bearings and spindle are all not rigid enough. The chinese benchtop mills like http://www.littlemachineshop.com sells, or Grizzly, or Harbor freight, etc, are a step up in rigidity, but less work...
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    One KiloWatt 18S Bulk Charger

    My inspiration to use the HLG power supply in the first place is attributable to Shane Colton. http://scolton.blogspot.com/2010/05/super-mean-well-scooter-fast-charger.html , and since reading that post back in 2010 I have heard of several instances of people using LED power supplies (HLG and...
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    CroBorg Super Commuter

    These supplies are awesomely efficient. For so little surface area the temperature rise is really reasonable. I like the timer approach, combined with a cycle analyst if you want info. Those mechanical countdown timers like are used for the bathroom heater or spa jets are just fine, in the past...
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    Anderson PowerPole question

    Indeed the connectors I posted photos of are in a different class than the "amateur electrician" produced connections we're usually working with. I decided to do a little testing this morning to see what would happen. I crimped a powerpole 45 amp contact onto each end of a 6" piece of high...
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    Anderson PowerPole question

    Gen 1 prius main battery lugs Gen 2 prius main battery lugs (ultrasonically welded??) Insight If you were to try to "disassemble" any of these professionally made (or any other properly crimped) connection you would find it very tough going. Nobody uses solder in these kinds of...
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    The Unofficial 'CroMotor' Owners Tech-Tips Thread

    It would take a bit of thinking to implement it well but I bet it would be possible to apply dzus fasteners to the GB canopies, which would be very awesome. http://www.dzusfasteners.net/pages/Dzus-Meaurement-Guide.html http://secure.chassisshop.com/pdf/Body-Fabrication.pdf
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    Lipo on the way, What first?!

    This is my favorite piece of advice about building a big pack from HK Lipo. http://endless-sphere.com/forums/viewtopic.php?f=34&t=38171#p556607 Right now my desk at work looks like this: I am running two cycles on each pack with the computer logging the data from the charge/discharge. It is...
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    Farfle joins the MENS club

    It should be a pretty beefy motor, for sure. Got any idea what it might weigh all built? Start WAG: There's two parts to the power question- one is will it saturate and get really inefficient at the current levels you will need to run for 25 horsepower- It's got a heck of a lot of stator and...
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