Search found 172 matches

by acuteaero
Jan 06 2016 9:38pm
Forum: Large EV General Discussion
Topic: 1,000lb "Elec-tow’d” Electric Tow’d Dune Buggy Build Thread
Replies: 174
Views: 51590

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

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 weather i...
by acuteaero
Jan 06 2016 9:28pm
Forum: Large EV General Discussion
Topic: Toyota Prius 2008 battery upgrade
Replies: 1
Views: 1006

Re: 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 electr...
by acuteaero
Mar 23 2013 11:55pm
Forum: General Discussion
Topic: ES Meetup and Project Showcase at SF Maker Faire, May 18-19
Replies: 61
Views: 15185

Re: ES Meetup and Project Showcase at SF Maker Faire, May 18

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... https://lh3.googleusercontent.com/-IT790cE20pA/UU6GJBqxAzI/AA...
by acuteaero
Mar 23 2013 11:30pm
Forum: Large EV General Discussion
Topic: Questions for Toyota Prius owners.
Replies: 49
Views: 8466

Re: 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 capacit...
by acuteaero
Jan 19 2013 10:04pm
Forum: Motor Technology
Topic: Tabletop Engine Dyno *Build In Progress*
Replies: 34
Views: 11527

Re: Tabletop Engine Dyno *Build In Progress*

That load was a great choice. Be careful you don't set the wall on fire though,. 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 e...
by acuteaero
Jan 19 2013 9:57pm
Forum: Motor Technology
Topic: Tabletop Engine Dyno *Build In Progress*
Replies: 34
Views: 11527

Re: Tabletop Engine Dyno *Build In Progress*

A typical alternator can easily do way more than 12v. Most have diodes rated for 50-60v, so don't exceed that unless you know the exact ratings. If you run a higher voltage into the load, you can get much more power out of it for a given amount of heating. Pumping the power back into the pack drivi...
by acuteaero
Jan 19 2013 1:30am
Forum: Motor Technology
Topic: Tabletop Engine Dyno *Build In Progress*
Replies: 34
Views: 11527

Re: 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 and take th...
by acuteaero
Jan 19 2013 1:08am
Forum: Motor Technology
Topic: Tabletop Engine Dyno *Build In Progress*
Replies: 34
Views: 11527

Re: 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!

by acuteaero
Jan 19 2013 1:05am
Forum: Motor Technology
Topic: Tabletop Engine Dyno *Build In Progress*
Replies: 34
Views: 11527

Re: 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! https://lh6.googleusercontent.com/-Vlw6COdS3uU/UPSI7EzNewI/AAAAAAAABYo/jziZSn7zZMM/s720/IMG_20130111_174958.jpg New since last time: -Motor mounting plate: This I ended up designing as a ...
by acuteaero
Oct 27 2012 4:02pm
Forum: Battery Technology
Topic: Testing the HP ESP-135 Server supply and isolation modding.
Replies: 44
Views: 11045

Re: Testing the HP ESP-135 Server supply and isolation moddi

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 something, but...
by acuteaero
Sep 16 2012 6:50pm
Forum: E-vents
Topic: bairdco racing at adams, september 15, 2012
Replies: 114
Views: 18250

Re: 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 transporter...
by acuteaero
Aug 11 2012 8:33pm
Forum: Battery Technology
Topic: One KiloWatt 18S Bulk Charger
Replies: 158
Views: 17989

Re: Bulk Charge Controller

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 input/output w...
by acuteaero
Aug 09 2012 11:32pm
Forum: E-Bike General Discussion
Topic: CroBorg Super Commuter
Replies: 1029
Views: 119954

Re: CroBorg Commuter

I don't think it is quite there, but it is close. Acuteaero cut some joints apart, and they weren't quite "solid" but they are not separable except by cutting. 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...
by acuteaero
Aug 02 2012 1:02am
Forum: General Discussion
Topic: Small home cnc machine advice
Replies: 20
Views: 3131

Re: Small home cnc machine advice

video 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 ...
by acuteaero
Aug 01 2012 11:19pm
Forum: General Discussion
Topic: Small home cnc machine advice
Replies: 20
Views: 3131

Re: 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 of th...
by acuteaero
Aug 01 2012 11:11pm
Forum: Battery Technology
Topic: One KiloWatt 18S Bulk Charger
Replies: 158
Views: 17989

Re: Bulk Charge Controller

This unit is specifically being designed for these LED power supplies and 6S Lipo. It can be used for other purposes, or it can also be the starting point for some other design variations. Anyone want to make a variation? My 2c- I would install this in my charging system if it were set up to run at...
by acuteaero
Aug 01 2012 10:59pm
Forum: General Discussion
Topic: Small home cnc machine advice
Replies: 20
Views: 3131

Re: 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 on it...
by acuteaero
Aug 01 2012 8:16pm
Forum: General Discussion
Topic: Small home cnc machine advice
Replies: 20
Views: 3131

Re: 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 envelo...
by acuteaero
Jul 30 2012 8:23pm
Forum: Battery Technology
Topic: One KiloWatt 18S Bulk Charger
Replies: 158
Views: 17989

Re: Bulk Charge Controller

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 otherw...
by acuteaero
Jul 24 2012 6:48pm
Forum: E-Bike General Discussion
Topic: CroBorg Super Commuter
Replies: 1029
Views: 119954

Re: CroBorg Commuter

The supply got warm but not much heat was generated. So far they look great! A large AC timer would also work as a stop-gap. Can't get much simpler than that! These supplies are awesomely efficient. For so little surface area the temperature rise is really reasonable. I like the timer approach, com...
by acuteaero
Jul 24 2012 11:22am
Forum: E-Bike Technical
Topic: Anderson PowerPole question
Replies: 130
Views: 7066

Re: Anderson power poles

I've had no trouble using small hand tools to open or remove up to 10ga crimped connections made by anybody, which is what I and others here are discussing. If I wanted to open up 00 gauge crimps, I reckon I'd be using different tools and possibly different techniques. I'm a metalworker by trade an...
by acuteaero
Jul 23 2012 9:30pm
Forum: E-Bike Technical
Topic: Anderson PowerPole question
Replies: 130
Views: 7066

Re: Anderson power poles

Properly crimped wires can loosen, corrode, or both. Crimped and soldered wires can't do either of these things. "Cold welds"? I think you mean "points of contact". I have never had any problem prying open and teasing apart the strands of anybody's crimped connection when I wanted to. Ain't nothing...
by acuteaero
Jul 23 2012 8:56pm
Forum: E-Bike Technical
Topic: The Unofficial 'CroMotor' Owners Tech-Tips Thread
Replies: 487
Views: 83351

Re: 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 ... Guide.html
http://secure.chassisshop.com/pdf/Body-Fabrication.pdf
by acuteaero
Jul 23 2012 3:11pm
Forum: E-Bike General Discussion
Topic: Lipo on the way, What first?!
Replies: 12
Views: 943

Re: 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: https://lh4.googleusercontent.com/-ejDbvC-2vio/UA2t8ku8ryI/AAAAAAAAAzM/AjL9QDzOVrU/s640/0723121258.jpg I am runni...
by acuteaero
Jul 11 2012 8:57am
Forum: Motor Technology
Topic: Farfle joins the MENS club
Replies: 171
Views: 27381

Re: Farfle joins the MENS club

Thanks for the info on chain. The stock UM was fine at 5kw, this is two motors, rewound with a better copper fill, and spinning three times as fast with a slick centrifugal fan on the end, somewhat astro-esq. How much Hp do you think a well cooled 175x80mm outrunner can make? It should be a pretty ...