Search found 188 matches

by Buk___
Dec 10, 2017 7:31 pm
Forum: E-Bike General Discussion
Topic: Car replacement in London/Other Cold Weather
Replies: 3
Views: 33

Re: Car replacement in London/Other Cold Weather

Hey everyone. I have just accepted a secondment to London to build a new branch of my boss' business. It's happening Nov-Dec. 2018, with an ideal launch date of Jan 2019, so just under a year away. My wife wants to try to live without a car there, despite having two young children. She believes own...
by Buk___
Dec 10, 2017 4:43 pm
Forum: E-Bike Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1683
Views: 469473

Re: Your Creation's Before & After Pics

eCue wrote:
Dec 10, 2017 3:54 pm
Friction drive ?
Does it rub you the wrong way :)
by Buk___
Dec 10, 2017 4:39 pm
Forum: Motor Technology
Topic: OpenSource firmware BMSBattery S/Kunteng KT controllers STM8
Replies: 1062
Views: 25429

Re: OpenSource firmware BMSBattery S/Kunteng KT controllers STM8

2. Original will be erased so not possible to restore. Anyway, the controller is cheap, buy 2 units! So, no way to take a copy of the existing firmware before uploading yours and then put it back if things aren't working out? 4. Sorry don't know to what are you referring about This thread covers it...
by Buk___
Dec 10, 2017 4:04 pm
Forum: Motor Technology
Topic: OpenSource firmware BMSBattery S/Kunteng KT controllers STM8
Replies: 1062
Views: 25429

Re: OpenSource firmware BMSBattery S/Kunteng KT controllers STM8

Four questions: Is the S12SN controller compatible with your firmware? If so, having programmed it with your code, can the original code be easily restored? If so, what is required to upload your code to it? Finally, would using a DC-DC booster with a settable constant current output between the bat...
by Buk___
Dec 10, 2017 11:16 am
Forum: E-Bike Technical
Topic: v-brake front fork mounting points?
Replies: 7
Views: 83

Re: v-brake front fork mounting points?

Not sure if replying to oneself is the done thing here, but I found some further info that whilst not definitive at least seems consistent and reasonably authoritative here, which I'll post in case the title draws anyone else to this thread. From: "goodrichbikes" Subject: Re: Frame Canti Boss Locati...
by Buk___
Dec 10, 2017 8:25 am
Forum: E-Bike Technical
Topic: v-brake front fork mounting points?
Replies: 7
Views: 83

Re: v-brake front fork mounting points?

I would guess that height above the rim for the boss could be measured right off the particular v brake you plan to use. Or just copy a fork, or rear stay measurement. Distance from center of axle to the center of the boss, for that wheel size. Then like Chalo said depending on the wheel you plan t...
by Buk___
Dec 10, 2017 3:55 am
Forum: E-Bike Technical
Topic: v-brake front fork mounting points?
Replies: 7
Views: 83

Re: v-brake front fork mounting points?

Since they are all interchangeable (arms for Vbrake all fit all the Vbrake bosses), then yes. But there are a number of bosses that look similar and are similarly--but not identically--placed, for other kinds of brake arms. See the Sheldon Brown site for info on the various systems. (best first pla...
by Buk___
Dec 09, 2017 1:47 pm
Forum: Motor Technology
Topic: Game Changer Page 3 with video of 1700amps!!!!
Replies: 84
Views: 9351

Re: Game Changer Page 3 with video of 1700amps!!!!

i know the old style connectors suck by todays standards. (the new stuff is quite nice actually. but lets be honest, if you are messing around like we are with currents well into the triple digits you need to think hard about what you are doing. and everyone knows that there are people that will th...
by Buk___
Dec 09, 2017 12:59 pm
Forum: E-Bike Technical
Topic: v-brake front fork mounting points?
Replies: 7
Views: 83

v-brake front fork mounting points?

Not strictly an E-bike question -- though my purpose is e-bike -- are there any standards defining the dimensions of front fork V-brake mounting points?

Thanks, Buk.
by Buk___
Dec 09, 2017 10:50 am
Forum: E-Bike Technical
Topic: Speed vs Range
Replies: 20
Views: 3201

Re: Speed vs Range

DrkAngel wrote:
Dec 09, 2017 8:23 am
Mapped performance of an old hub motor.
26" wheel outputs a continuous 23mph.
System A is showing 36 inch wheel in the screen shot???!
by Buk___
Dec 09, 2017 9:59 am
Forum: E-Bike General Discussion
Topic: OpenEbike - open source frame design
Replies: 8
Views: 188

Re: OpenEbike - open source frame design

Ok. Well, let's see what we can achieve with just bolts. Here's the problem. Without triangulation or the cell ends being braced by continuous closure, there is very little material to prevent this from happening: HexagonSpacerShear.jpg Also, producing hexagons from sheet -- through a subtractive p...
by Buk___
Dec 09, 2017 7:52 am
Forum: E-Bike General Discussion
Topic: OpenEbike - open source frame design
Replies: 8
Views: 188

Re: OpenEbike - open source frame design

... the honeycomb structures are going to be covered with 1 mm of flat metal sheet to reinforce it. Just covering the honeycomb will do almost nothing for its strength. Those coverings would need to be permanently bonded to the top and bottom edges of the cells to give any extra rigidity. In a manu...
by Buk___
Dec 08, 2017 8:12 pm
Forum: E-Bike General Discussion
Topic: OpenEbike - open source frame design
Replies: 8
Views: 188

Re: OpenEbike - open source frame design

- ultra light - we use honeycomb structure to reduce mass Those honeycomb spacers might look cool; but they are not triangulated and will flex in plane and could shear under high stress or impact. Yes. I thought that the lightweight honeycomb structure used in aerospace were typically sandwich stru...
by Buk___
Dec 08, 2017 7:31 pm
Forum: Motor Technology
Topic: Game Changer Page 3 with video of 1700amps!!!!
Replies: 84
Views: 9351

Re: Game Changer Page 3 with video of 1700amps!!!!

i am talking about using proper milspec connectors rated for the task, not stuff to fix dodgy undersized connectors. The military use it on their military spec connectors; for 15 years of corrosion free, vibration proof connections. NASA use it on their space spec connectors to ensure 15 years of g...
by Buk___
Dec 08, 2017 12:46 pm
Forum: General Discussion
Topic: can you help me source this LED?
Replies: 5
Views: 87

Re: can you help me source this LED?

yes. found the company myself, but couldn't find the PCB only on their website. seems they do special complete lamps only. Oh, okay. (I just thought that as they have a webpage dedicated to the LED part number, it might be an old part that has been superseded. Perhaps if you contact them, they migh...
by Buk___
Dec 08, 2017 10:57 am
Forum: General Discussion
Topic: can you help me source this LED?
Replies: 5
Views: 87

Re: can you help me source this LED?

this is a led from a desk lamp. powered by a constant current power supply 12V 500mA. diameter of the PCB is 24mm. tried to find this thing on ebay or aliexpress but w/o success. no idea what to search for. i searched for "high power led" "12v 5W" "COB" "24mm" a combination of it ... any help would...
by Buk___
Dec 08, 2017 9:51 am
Forum: Motor Technology
Topic: Game Changer Page 3 with video of 1700amps!!!!
Replies: 84
Views: 9351

Re: Game Changer Page 3 with video of 1700amps!!!!

flippy wrote:
Dec 08, 2017 7:19 am
if you are really paranoid you can get milspec stuff.
It IS milspec stuff. US Army, Navy and Airforce, Nasa, Nato, .... It's the real deal.
by Buk___
Dec 08, 2017 9:48 am
Forum: E-Bike General Discussion
Topic: OpenEbike - open source frame design
Replies: 8
Views: 188

Re: OpenEbike - open source frame design

conrader wrote:
Dec 08, 2017 4:09 am

- ultra light - we use honeycomb structure to reduce mass
Those honeycomb spacers might look cool; but they are not triangulated and will flex in plane and could shear under high stress or impact.
by Buk___
Dec 07, 2017 11:59 am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38174

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

Arlo1 wrote:
Dec 07, 2017 11:26 am
Seems like its the motors doing it. To hold a car on a slope like that the amount of energy used is VERY small!
This seems to indicate that hill start assist on the Tesla is done using the brakes not the motor.
by Buk___
Dec 06, 2017 6:33 pm
Forum: E-Bike Photos & Video
Topic: 'Triangle power'
Replies: 10
Views: 580

Re: 'Triangle power'

Mongo1 wrote:
Dec 06, 2017 12:38 pm

Here are a couple of images. I don't do much off-roading right now so haven't had a problem of light bouncing around (if needed I can always mount it on handlebar).

light small 2.jpg

light small front.jpg
Thanks! Looks like a neat way to get the light where you want it.
by Buk___
Dec 06, 2017 5:06 pm
Forum: Motor Technology
Topic: Game Changer Page 3 with video of 1700amps!!!!
Replies: 84
Views: 9351

Re: Game Changer Page 3 with video of 1700amps!!!!

Looks interesting! Horribly expensive, but a tiny amount goes a very long way, seemingly lasts for ever (at least 15 years they claim), and it works miracles on PC/server cards, which is where I first used it years ago. It's also very strange stuff. You can safely wipe it along a set of edge connec...
by Buk___
Dec 06, 2017 4:15 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Mid-Drive Build - comments and recommendations welcome
Replies: 30
Views: 1021

Re: Mid-Drive Build - comments and recommendations welcome

markz wrote:
Dec 06, 2017 4:04 pm
I do not charge to 4.20V/cell, but I charge the entire pack to 62 instead of 63
Hm. 62V / 10S = 6.2/cell? Special cells!
by Buk___
Dec 06, 2017 1:31 pm
Forum: E-Bike General Discussion
Topic: Visually distinguishing screw-on freewheels from "cassette freewheels"?
Replies: 19
Views: 293

Re: Visually distinguishing screw-on freewheels from "cassette freewheels"?

Yet, even those riding low power PAS are usually simplifying their drive train pretty soon. It's my intent that I should pedal most of the time, at least until my body can no longer sustain it. Whether that will pan out in reality time will tell. I also want the bike to be usable -- I mean really, ...
by Buk___
Dec 06, 2017 12:18 pm
Forum: Motor Technology
Topic: Game Changer Page 3 with video of 1700amps!!!!
Replies: 84
Views: 9351

Re: Game Changer Page 3 with video of 1700amps!!!!

Arlo1 wrote:
Feb 02, 2016 10:45 pm
... maybe with some silver grease under that so they conduct well.
Have you (anyone here?) tried Stabilant 22 contact enhancer for this purpose?
by Buk___
Dec 06, 2017 9:50 am
Forum: E-Bike General Discussion
Topic: Visually distinguishing screw-on freewheels from "cassette freewheels"?
Replies: 19
Views: 293

Re: Visually distinguishing screw-on freewheels from "cassette freewheels"?

Do you know of any (UK) BS that sells an 11-28T screw-on freewheel? If so, link name/address please. . De nada. Hm. Apparently, that literally translates as "there's nothing to be thankful about"; but can also mean "You're welcome". The only interpretation I can muster for its use in the quoted con...