Search found 749 matches

by PRW
Apr 18 2019 4:34pm
Forum: General Discussion
Topic: Aluminium vs steel contraction when frozen
Replies: 8
Views: 137

Re: Aluminium vs steel contraction when frozen

Honestly, it's well known brain-teaser as to whether the hole in a ring gets bigger or smaller when it's heated. The trick is to mentally uncoil the ring into a rod. When you heat a rod it obviously gets much longer than it does thicker and if re-bent into a ring it would have both a larger outside...
by PRW
Apr 18 2019 2:24pm
Forum: General Discussion
Topic: Aluminium vs steel contraction when frozen
Replies: 8
Views: 137

Re: Aluminium vs steel contraction when frozen

the above replies are exactly what I thought, logically - until my wife gave her opinion which confused the hell out of me.... Her view is that when metal expands, all the metal will get bigger - so the hole gets smaller. When the metal freezes, all the metal shrinks, so the hole gets bigger. My min...
by PRW
Apr 18 2019 4:57am
Forum: General Discussion
Topic: Aluminium vs steel contraction when frozen
Replies: 8
Views: 137

Aluminium vs steel contraction when frozen

So, I have a bearing outer ring stuck in a aluminium frame (the swingarm). The bearing has broken, leaving only the outer ring wedged in.

If I put the the swing arm in a freezer - would the aluminium extra contraction make it easy to extract? How brittle would the aluminium become if frozen?

Thanks
by PRW
Mar 30 2019 11:47pm
Forum: Battery Technology
Topic: where to get 20s 220v charger
Replies: 2
Views: 94

Re: where to get 20s 220v charger

thanks AW, great info. Will have a look.
by PRW
Mar 30 2019 10:52pm
Forum: Battery Technology
Topic: where to get 20s 220v charger
Replies: 2
Views: 94

where to get 20s 220v charger

Does anyone where to get a 20s 220v charger, that is reasonable quality?
thanks
by PRW
Mar 26 2019 1:39pm
Forum: Motor Technology
Topic: "Edge" DD hubmotor, 1500W, 35mm, Al core
Replies: 179
Views: 19769

Re: "Edge" DD hubmotor, 1500W, 35mm, Al core

Hey guys, Due to a loose screw on my disc brake, I've managed to yank out my phase/hall wires from my Edge motor. Anyone have tips for pulling apart the Edge motor so I can go in and try to repair the damage? I've taken out the screws, pulled apart the motor part of the way and now the edge of the ...
by PRW
Mar 25 2019 1:08am
Forum: Battery Technology
Topic: Universal charger?
Replies: 3
Views: 129

Re: Universal charger?

thanks Sunder/ Leftiebiker…...
by PRW
Mar 24 2019 11:30pm
Forum: Battery Technology
Topic: Universal charger?
Replies: 3
Views: 129

Universal charger?

Hi,
is the charger shown below universal? 110v is marked in red, but the similar chargers I can see on the internet are noted as 110v / 220v.
thanks
charger.jpg
charger.jpg (84.87 KiB) Viewed 105 times
by PRW
Mar 24 2019 3:55am
Forum: E-Bike Build Threads / Photos & Video
Topic: Stealth FUTR owners builds and pics
Replies: 2250
Views: 143609

Re: Stealth FUTR owners builds and pics

Allex wrote:
Mar 22 2019 8:15am
Its Fiberglass
So something like this
https://www.asp-rocketry.com/ecommerce/ ... ?cat_id=67
Allex,
I sent you a PM - can you have a look?
thanks
Peter
by PRW
Mar 19 2019 7:00pm
Forum: E-Bike General Discussion
Topic: First build, heavy rider, thinking BBSHD, seeking some advice/input
Replies: 10
Views: 376

Re: First build, heavy rider, thinking BBSHD, seeking some advice/input

Glasswalker, some more reading … bikes that fit BBSHDs https://electricbike.com/forum/forum/builds/ebike-building-directions/7635-bikes-that-are-compatible-with-a-bbshd-and-bbso2-kits/page1 and geared motors vs direct... http://www.ebikeschool.com/geared-hub-motors-vs-gearless-hub-motors/ I will hav...
by PRW
Mar 19 2019 1:17pm
Forum: E-Bike General Discussion
Topic: First build, heavy rider, thinking BBSHD, seeking some advice/input
Replies: 10
Views: 376

Re: First build, heavy rider, thinking BBSHD, seeking some advice/input

Actually, another alternative is a geared hub like the Mac 10T - great for commuting, in that you are not manually changing gears all the time. I am not sure of the hill performance vs the BBSHD, but you can have a play on this https://www.ebikes.ca/tools/simulator.html, and see what happens...
by PRW
Mar 19 2019 12:49pm
Forum: E-Bike General Discussion
Topic: First build, heavy rider, thinking BBSHD, seeking some advice/input
Replies: 10
Views: 376

Re: First build, heavy rider, thinking BBSHD, seeking some advice/input

I agree with the used downhill bike comments - as a heavier rider, it is much more comfortable (and safer for roads with unexpected kerbs etc) with full suspension, adjusted to suit your weight. BBSHD is a good choice as well - my wife has one, I have been so impressed at how it does off road, I am ...
by PRW
Mar 09 2019 2:29pm
Forum: E-Bike General Discussion
Topic: Battery Shipping USA to New Zealand
Replies: 8
Views: 414

Re: Battery Shipping USA to New Zealand

Well, at least you did not get busted for shipping them as something else than a battery. Sounds like more pain in the ass than it was worth to me though. Last china shipped battery I got, came labeled as a power supply. It burned my house down a year later. well, if I had sold them in a hurry, I w...
by PRW
Mar 07 2019 1:58pm
Forum: E-Bike General Discussion
Topic: Battery Shipping USA to New Zealand
Replies: 8
Views: 414

Re: Battery Shipping USA to New Zealand

An update on this, in case anyone finds the information useful. I ended up shipping the batteries well protected in 2 Luna ammunition containers. The shippers didn’t have a clue what to do with them - 2 days before there was a panicked email for a MSDS from the “manufacturer “. As none of them have ...
by PRW
Jan 22 2019 3:32am
Forum: Battery Technology
Topic: UK plug charger for Luna Cycle Mighty Mini
Replies: 6
Views: 186

Re: UK plug charger for Luna Cycle Mighty Mini

https://em3ev.com/shop/58v8-charger/

you may have to change the plug to the battery / check positive and negative
by PRW
Nov 13 2018 8:55am
Forum: E-Bike Build Threads / Photos & Video
Topic: A couple more Norcos
Replies: 10
Views: 840

Re: A couple more Norcos

I live in a world where innovation, design skill and craftmanship are valued. Not everything can or should be broken down to base material cost and compared to cheap alternatives - although if you do, there is still value here, where you add the original frame, design, fabrication, welding and paint...
by PRW
Nov 12 2018 6:06pm
Forum: Items for Sale - Used
Topic: NO LONGER AVAILABLE - Luna Mighty Mini 52v battery -
Replies: 4
Views: 800

Re: Luna Mighty Mini 52v battery - Sunnyvale, CA

Price dropped to $200, collect only
by PRW
Nov 10 2018 11:38am
Forum: E-Bike General Discussion
Topic: Battery Shipping USA to New Zealand
Replies: 8
Views: 414

Re: Battery Shipping USA to New Zealand

thanks Bigwheel, that's a good start for research.
by PRW
Nov 08 2018 12:16pm
Forum: E-Bike General Discussion
Topic: Battery Shipping USA to New Zealand
Replies: 8
Views: 414

Battery Shipping USA to New Zealand

so, I am off to NZ next week. The relocation services I am using doesn't have a clue what to do about batteries - I have 4 that I need to ship. Batteries are 18650 cells, all professionally made, no issues ever. I have 2 ammo containers - I was planning on discharging to around 3.6v/ cell, making su...
by PRW
Oct 30 2018 10:51pm
Forum: Items for Sale - New
Topic: Edge 1500W rear hub motor 26" with hubsinks Sunnyvale CA
Replies: 2
Views: 437

Re: Edge 1500W rear hub motor 26" with hubsinks Sunnyvale CA

Winstonk24 wrote:
Oct 30 2018 10:01pm
What are the windings?
this is the motor I bought -

https://laebike.com/products/generic-hub-1500w-bare. States 9.4kv.

This is a picture from the article in the first post.
edge150011.jpg
edge150011.jpg (75.11 KiB) Viewed 320 times
Screen Shot 2018-10-30 at 8.51.48 PM.png
That's all I know!
by PRW
Oct 25 2018 2:44pm
Forum: Items for Sale - Used
Topic: SOLD - (US) Sunnyvale, CA - Mac 10T and parts $50
Replies: 12
Views: 1018

Re: SOLD - (US) Sunnyvale, CA - Mac 10T and parts $50

Hi, sorry, this has just been sold and collected...
by PRW
Oct 23 2018 4:46pm
Forum: Items for Sale - Used
Topic: SOLD - (US) Sunnyvale, CA - Mac 10T and parts $50
Replies: 12
Views: 1018

Re: (US) Sunnyvale, CA - Mac 10T and parts $50

I am busy decluttering my life... by not having a car, I can't get to the post office! However, I will be in Walnut Creek this Saturday, if you want to meet up there in the afternoon
by PRW
Oct 23 2018 3:46pm
Forum: Items for Sale - Used
Topic: SOLD - (US) Sunnyvale, CA - Mac 10T and parts $50
Replies: 12
Views: 1018

Re: (US) Sunnyvale, CA - Mac 10T and parts $50

my problem is, I no longer have a car... so can't get to Sacramento!