Search found 5557 matches

by Chalo
Dec 14, 2017 2:32 am
Forum: General Discussion
Topic: Mounting odd hub into truing stand
Replies: 8
Views: 69

Re: Mounting odd hub into truing stand

If it weren't for the scabby welds holding the broached disc into the end of the hub tube, it would be plausible to find a fender washer that could center a small diameter thread or rod in the hub. But no. Schwines are for selling, not riding or servicing.
by Chalo
Dec 14, 2017 2:23 am
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 33
Views: 662

Re: Specific heat absorption capacity of disc brakes

Cool. If you don't like it, don't give up on roller brakes. Just try one of the bigger models.
by Chalo
Dec 13, 2017 10:32 pm
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 33
Views: 662

Re: Specific heat absorption capacity of disc brakes

Roller brakes feel mushy but work well, within their limits. BR-IM70, -IM80, and -IM81 are the ones to go for. They have better heat sinking and more powerful roller cams than other models. Like other drum brakes, they're impervious to weather and external contamination. Unlike other drum brakes, th...
by Chalo
Dec 13, 2017 10:24 pm
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 33
Views: 662

Re: Specific heat absorption capacity of disc brakes

markz wrote:
Dec 13, 2017 9:17 pm
Chalo wrote:
Dec 13, 2017 2:11 pm
pic
2 U-brackets to stiffen it up?
One of them is the fork arch that keeps the sliders working together.
by Chalo
Dec 13, 2017 6:12 pm
Forum: General Discussion
Topic: ? Gross Brake = 3000w Brushless Hub motor
Replies: 8
Views: 56

Re: ? Gross Brake = 3000w Brushless Hub motor

Brake horsepower for a hub motor is by definition mechanical output at the wheel, not electrical input. Your motor is doing maybe 3hp at 3000W under optimum operating conditions.
by Chalo
Dec 13, 2017 2:46 pm
Forum: General Discussion
Topic: Mounting odd hub into truing stand
Replies: 8
Views: 69

Re: Mounting odd hub into truing stand

amberwolf wrote:
Dec 13, 2017 2:30 pm
Why not just use a threaded rod with nuts, or a bolt or other metal rod of the correct diameter to emulate the axle?
The D-shaped hole causes the wheel to set up off center.
by Chalo
Dec 13, 2017 2:40 pm
Forum: E-Bike General Discussion
Topic: Freewheel Maintenance
Replies: 19
Views: 302

Re: Freewheel Maintenance

I can see them grinding to dust if you don't flush the sand out often enough though. That's why I pour oil through them on the dirt bikes, messy as that is. Here, the dry and gritty freewheels I flush out are full of rust, not dust. I wash out most of the crud with solvent, then squirt in enough Tr...
by Chalo
Dec 13, 2017 2:20 pm
Forum: General Discussion
Topic: can you help me source this LED?
Replies: 10
Views: 146

Re: can you help me source this LED?

It is strange that the manufacturer of the lamp wouldn't use a more common format of LED. But lately it seems that chip-on-board PCB LEDs come in all sorts of shapes and sizes. Every time I retrofit a light from tungsten or fluorescent, it seems that the available choices have changed (and that the ...
by Chalo
Dec 13, 2017 2:11 pm
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 33
Views: 662

Re: Specific heat absorption capacity of disc brakes

I definitely want to use a disc brake upfront if you use quality parts nothing else has its stopping power That's a generalization usually made by folks who'll pay $200 for a disc brake, but have never tried a linear-pull brake over $20. It just isn't true overall. In fact, it's usually only possib...
by Chalo
Dec 13, 2017 6:35 am
Forum: Polls & Surveys
Topic: Would you put solar panel on your electric vehicle
Replies: 4
Views: 180

Re: Would you put solar panel on your electric vehicle

Me? Maybe, depending on lots of factors. Like, does the vehicle have a roof anyway? What's the power that could be produced from a suitably sized panel versus how much juice does the the vehicle use? Is there any reason to have a separate power system for lighting and accessories (that could be used...
by Chalo
Dec 13, 2017 6:10 am
Forum: General Discussion
Topic: can you help me source this LED?
Replies: 10
Views: 146

Re: can you help me source this LED?

You can get 1W or 3W individual LED emitters that are only about 8mm in diameter, and that have forward voltages of about 3.5V. Three or four of those epoxied to a 24mm disc heatsink of your liking, and soldered in series, would fit in the same package and do the same job. Add a resistor or a power ...
by Chalo
Dec 13, 2017 5:44 am
Forum: E-Bike General Discussion
Topic: OpenEbike - open source frame design
Replies: 17
Views: 312

Re: OpenEbike - open source frame design

For Bolts use what Airplanes use , AN bolts. Don't do that. AN fasteners are not extra strong or extra good; they're only extra expensive. And they are highly traceable and certified, which doesn't help us nearly as much as it does the aerospace industry. They're also plated with super toxic cadmiu...
by Chalo
Dec 13, 2017 4:51 am
Forum: E-Bike Technical
Topic: Specific heat absorption capacity of disc brakes
Replies: 33
Views: 662

Re: Specific heat absorption capacity of disc brakes

My bike has v-brakes on it which we all know barely work in the rain , luckily the fork has a disc mount so will be putting a mechanical caliper and a 180mm disc on it for wet weather stopping power. You'd think that disc brakes didn't get wet, or something. My first disc brakes (Mountain Cycle Pro...
by Chalo
Dec 13, 2017 4:36 am
Forum: E-Bike General Discussion
Topic: Freewheel Maintenance
Replies: 19
Views: 302

Re: Freewheel Maintenance

As soon as you build a hub motor bike with too much speed to pedal, the freewheel bearings are spinning most of the time, and heated by the motor contact. But you understand that there is still no radial or axial load on the bearings while they turn, unless you've overtightened the chain? I don't s...
by Chalo
Dec 13, 2017 4:21 am
Forum: E-Vehicles General Discussion
Topic: Madness. Why such slow penetration for hybrid?
Replies: 60
Views: 1057

Re: Madness. Why such slow penetration for hybrid?

solera ebiker wrote:
Dec 12, 2017 7:35 pm
Judge Roy Moore
1/2 hour to victory!
Noted
by Chalo
Dec 12, 2017 11:44 pm
Forum: Battery Technology
Topic: Question about hobby charger amperage fluctuation
Replies: 8
Views: 69

Re: Question about hobby charger amperage fluctuation

That sounds like they're balancing, but not charging per se. Maybe do that once in a while, but bulk charge on a routine basis?
by Chalo
Dec 12, 2017 6:36 pm
Forum: Battery Technology
Topic: Super glue nickel strips to 18650?
Replies: 13
Views: 286

Re: Super glue nickel strips to 18650?

No, i mean high melting point because batteries in the closed case can get very hot and the solder with low melting point can start losing their electrical characteristics. The higher the melting point is, the safer the contacts will be. Just how hot do you think batteries can get before self-destr...
by Chalo
Dec 12, 2017 6:08 pm
Forum: E-Bike General Discussion
Topic: Aluminum vs Steel vs Carbon E-bike Frames
Replies: 23
Views: 690

Re: Aluminum vs Steel vs Carbon E-bike Frames

For DIY, steel wins. You can bend it, weld things to it, braze things to it-- all without weakening it substantially. It's usually formed into round tubing of customary diameters, which is very convenient when trying to attach things. There's nothing wrong with aluminum if you can use the frame as i...
by Chalo
Dec 12, 2017 5:43 pm
Forum: E-Bike General Discussion
Topic: Freewheel Maintenance
Replies: 19
Views: 302

Re: Freewheel Maintenance

You need to use grease. I'm not sure what you're talking about, but every freewheel I've ever come across in 30 years of working on bikes was oil lubricated. Grease causes pawls to stick down and the freewheel to malfunction. It's not the worst idea to grease the bearing balls, separately from the ...
by Chalo
Dec 12, 2017 4:48 pm
Forum: E-Bike Technical
Topic: Batteries in a series and parallel question
Replies: 7
Views: 119

Re: Batteries in a series and parallel question

My first e-bike used two 12Ah SLA batteries with a 400W rated can motor, and it was very limited in its capabilities. On my second e-bike, I used three 17Ah to 22Ah SLA batteries with a 1000W rated hub motor. It was better, but very heavy, and still not a great performer. I think I'd have enjoyed th...
by Chalo
Dec 12, 2017 3:51 pm
Forum: E-Bike Technical
Topic: Batteries in a series and parallel question
Replies: 7
Views: 119

Re: Batteries in a series and parallel question

That's right. Discount half the rated capacity of SLA batteries if you want them to last for more than a handful of charges.

Those batteries suck. Trust all of us who've been there and done that.
by Chalo
Dec 12, 2017 3:15 pm
Forum: General Discussion
Topic: Mounting odd hub into truing stand
Replies: 8
Views: 69

Re: Mounting odd hub into truing stand

The only way I can think of is to modify a matching trike axle to use as a mandrel. Just a few days ago, I trued a wheel like that on a godforsaken Schwinn Meridian. I put the trike in a workstand and trued it using the tip of my left thumb as an indicator point. I trued the left wheel by putting an...
by Chalo
Dec 12, 2017 2:58 pm
Forum: Battery Technology
Topic: Question about hobby charger amperage fluctuation
Replies: 8
Views: 69

Re: Question about hobby charger amperage fluctuation

In the final stage of charging, it is common for chargers to cycle on and off. They turn on and battery voltage rises to the maximum value, and then the charger turns off automatically. Then the battery voltage falls a little bit, and the charger turns back on. This cycle continues until the battery...
by Chalo
Dec 12, 2017 2:48 pm
Forum: E-Bike General Discussion
Topic: Freewheel Maintenance
Replies: 19
Views: 302

Re: Freewheel Maintenance

Most freewheels that I have are White ind. single. Very easy to service. They had better be! You can buy at least ten ACS Main Drive freewheels at my shop for the price of a single White Industries freewheel. I don't think I could ever get enough life out of the sprocket teeth to make one cost-effe...
by Chalo
Dec 12, 2017 2:38 pm
Forum: General Discussion
Topic: Dirt bike fork on an ebike?
Replies: 14
Views: 200

Re: Dirt bike fork on an ebike?

Most of the moto lower triple clamps I have worked with were press fitted with steer tubes. Those are difficult but not impossible to retrofit with replacement steer tubes. Some are clamped on, and those are easy. In either case, to change to a different diameter steerer, you either have to ream the...