Search found 14547 matches

by John in CR
May 04 2021 3:19pm
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 718

Re: Welding down a torque arm

Regen makes practically no sense anyways as it makes tiny trickle charges. I can't believe someone is still posting these kinds of anti-regen falsehoods in 2021. -Regen adds range, it's like getting 5% or more of free battery. -Reduces maintenance time and cost (I haven't changed a brake pad or fid...
by John in CR
May 03 2021 11:21am
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 718

Re: Welding down a torque arm

It's oh so easy to fabricate a nice thick clamping torque arm for that. Then 3 smallish welds to secure it in place leaving it easily removed later to restore the fork to original form if desired, but it would still function like a clamping dropout so the wheel is easy on and off to change change ti...
by John in CR
May 03 2021 5:31am
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 718

Re: Welding down a torque arm

Even cheap torque arms typically work fine as long as axle nuts are nice and tight. Once regen is introduced all through hole torque arms are proven inadequate in the long run unless you go with a ridiculously expensive solution like Nord Lock nuts that prevent axle movement more than the torque arm...
by John in CR
May 02 2021 11:59pm
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 718

Re: Welding down a torque arm

Since you don't want to weld on your bike, fabricate a nice thick .25" or thicker clamping type torque arm. Almost none of my builds have the axle nuts installed on the hubmotor axle. My clamping dropouts hold the motor wheel on running power from 11kw-32kw peak input with regen braking on eve...
by John in CR
Apr 30 2021 12:32am
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 718

Re: Welding down a torque arm

Since you don't want to weld on your bike, fabricate a nice thick .25" or thicker clamping type torque arm. Almost none of my builds have the axle nuts installed on the hubmotor axle. My clamping dropouts hold the motor wheel on running power from 11kw-32kw peak input with regen braking on ever...
by John in CR
Apr 27 2021 3:40am
Forum: Bike Mechanical & Structural
Topic: Hub motor not working
Replies: 7
Views: 281

Re: Hub motor not working

Probably theres is a difference in the quality of winding wire, like how much insulation coating is on the winding wire itself. And how does that coating affect the motor itself, eddie losses, core losses etc. Couldnt you just keep coating that magnet winding wire and get the thickness of coating y...
by John in CR
Apr 26 2021 3:38pm
Forum: Bike Mechanical & Structural
Topic: Hub motor not working
Replies: 7
Views: 281

Re: Hub motor not working

Whatever you do don't buy another from the same manufacturer. That's the worst winding job I've ever seen on a hubbie. Not only are the turns around the teeth not neet, tight and uniform, but the long spans of magnet wire just doesn't appear right and is sure to result in failure. Wires in a motor w...
by John in CR
Apr 25 2021 7:20am
Forum: EBike Technical
Topic: Nucular Electronics owner's thread (setup infos, FW updates, links etc.)
Replies: 497
Views: 48964

Re: Nucular Electronics owner's thread (setup infos, FW updates, links etc.)

Should the min throttle voltage be set to just above the current throttle voltage, or just above it? When I set the brake voltage to just below the current brake voltage, I hear noise coming from the motor. Even with it set this low, the voltage does not change in real time when applying the brake....
by John in CR
Apr 25 2021 12:47am
Forum: Bike Mechanical & Structural
Topic: Frame building fixtures.
Replies: 12
Views: 501

Re: Frame building fixtures.

I think your right, the horizontal 4x4 rails as a base, and able to insert wheels is a grate idea. Gives you a nice base for all the other add on's, and can be more universal. Being able to put the wheels in while your building is a super good idea, like you say, wheels, chainline, and length is qu...
by John in CR
Apr 25 2021 12:10am
Forum: EBike Technical
Topic: Killed 2 bafang SWX02 motors. Yes, two!!!
Replies: 32
Views: 637

Re: Killed 2 bafang SWX02 motors. Yes, two!!!

Electrics don't like going very slow at low partial throttle, because they are very inefficient running like that and phase currents (the pulses going to the motor) spike sharply. When running inefficiently it turns much more juice from the battery into heat instead of work. More typically low parti...
by John in CR
Apr 24 2021 11:49pm
Forum: EBike Technical
Topic: Nucular Electronics owner's thread (setup infos, FW updates, links etc.)
Replies: 497
Views: 48964

Re: Nucular Electronics owner's thread (setup infos, FW updates, links etc.)

Should the min throttle voltage be set to just above the current throttle voltage, or just above it? When I set the brake voltage to just below the current brake voltage, I hear noise coming from the motor. Even with it set this low, the voltage does not change in real time when applying the brake....
by John in CR
Apr 23 2021 3:21pm
Forum: Bike Mechanical & Structural
Topic: Tire failure modes.
Replies: 19
Views: 657

Re: Tire failure modes.

I'm with MarkZ and Zerodish. Flats are a real pain in the butt on ebikes with substantial batteries and motors. You have a motor, so just use tires made for motor vehicles. So what if it adds a few pounds and a couple extra pennies a day in electricity. It's definitely worth it to me, even if the o...
by John in CR
Apr 23 2021 2:31pm
Forum: Bike Mechanical & Structural
Topic: 8020 Aluminum Recumbent Frame?
Replies: 7
Views: 245

Re: 8020 Aluminum Recumbent Frame?

Recommending use of a dull cutting tool is one of the strangest things I've heard on the forum. Yes aluminum and brass drill differently because they are softer and more ductile, so significantly higher rpm than used to drill steel is recommended. Sharp tools work best on aluminum (with adequate lu...
by John in CR
Apr 23 2021 10:38am
Forum: Bike Mechanical & Structural
Topic: 8020 Aluminum Recumbent Frame?
Replies: 7
Views: 245

Re: 8020 Aluminum Recumbent Frame?

Recommending use of a dull cutting tool is one of the strangest things I've heard on the forum. Yes aluminum and brass drill differently because they are softer and more ductile, so significantly higher rpm than used to drill steel is recommended.
by John in CR
Apr 23 2021 10:27am
Forum: Bike Mechanical & Structural
Topic: Tire failure modes.
Replies: 19
Views: 657

Re: Tire failure modes.

I'm with MarkZ and Zerodish. Flats are a real pain in the butt on ebikes with substantial batteries and motors. You have a motor, so just use tires made for motor vehicles. So what if it adds a few pounds and a couple extra pennies a day in electricity. It's definitely worth it to me, even if the on...
by John in CR
Apr 21 2021 7:18pm
Forum: Bike Mechanical & Structural
Topic: Working rear triangle to accommodate different hub widths. How much is too much
Replies: 11
Views: 477

Re: Working rear triangle to accommodate different hub widths. How much is too much

Steel you can bend and take it as far as you dare. Aluminum you can't bend, so just 5-10mm at the most, because aluminum doesn't do well under stress. You can't do the threaded rod stretching with aluminum. Steel ebikes are the way to go, then you can't easily mod and make any changes you want. If g...
by John in CR
Apr 21 2021 9:41am
Forum: Bike Mechanical & Structural
Topic: Frame building fixtures.
Replies: 12
Views: 501

Re: Frame building fixtures.

After just free-styling it on my ebike builds for the past 12 years, I'm gonna build a jig... Something easy like this one https://www.youtube.com/watch?v=0NdjDi95NFA but long enough and with 4"x 4" uprights so I can do the wheel holding like this guy does https://www.youtube.com/watch?v=I...
by John in CR
Apr 21 2021 4:40am
Forum: Bike Mechanical & Structural
Topic: EEB/Enduro physical tuning
Replies: 6
Views: 346

Re: EEB/Enduro physical tuning

Let's see that seat mount to make sure it's still strong enough. From the pic it looks to me hanging there on something than may dump you onto the tire.
by John in CR
Apr 13 2021 1:39am
Forum: EBike General Discussion
Topic: Hardware for a 120Volt 20ha series?
Replies: 11
Views: 422

Re: Hardware for a 120Volt 20ha series?

Forget the gasser unless you need more than 80-100km non-stop range. What is exactly what i need. I'm gonna be doing thousands of miles. It's my main mode of transport. I dont drive cars I havent driven a car in 16 years with the exception of re-upping my drivers license since I moved to another st...
by John in CR
Apr 09 2021 9:59am
Forum: EBike Technical
Topic: Modifying a Hub Motor
Replies: 55
Views: 1588

Re: Modifying a Hub Motor

You can't rewind a motor to make it able to make more torque at any voltage. A rewind accomplishes nothing that you can't accomplish by changing the voltage and current, unless you are able to fit more total copper around the stator teeth than the factory. If you want better performance from the sam...
by John in CR
Apr 09 2021 9:40am
Forum: EBike General Discussion
Topic: Hardware for a 120Volt 20ha series?
Replies: 11
Views: 422

Re: Hardware for a 120Volt 20ha series?

Forget the gasser unless you need more than 80-100km non-stop range. Then just get a real motor and boost your performance to exceed the gasser. I embarrass gassers every time I ride my ebikes and would never consider buying one of those smoke belching, noise making maintenance hogs.
by John in CR
Apr 05 2021 1:35am
Forum: General Discussion
Topic: Lightweighting and aerodynamic optimization of a subcompact car.
Replies: 78
Views: 1635

Re: Lightweighting and aerodynamic optimization of a subcompact car.

You know about golf ball dimples and how they help the golf ball fly further. Well, you can gain 14% fuel mileage with a dimpled car. :shock: https://youtu.be/8wG-gr_IRHQ?t=322 8) I've often wondered about dimpled surfaces for planes, cars, and boats to reduce drag, because when I was on the water ...
by John in CR
Mar 29 2021 6:30pm
Forum: Health and Food
Topic: What did you cook today??
Replies: 286
Views: 38481

Re: What did you cook today??

Sorry I'm just not into whether food looks pretty, so it's unlikely I'll post pics. Tonight is a special treat that you'll have to picture in your mind how good it will taste, and that's chicken hearts and livers with bacon en brochette with lots of veggies to go with it...sauteed bok choy, big leaf...
by John in CR
Mar 24 2021 7:58pm
Forum: EScooters/EMotorcycles
Topic: 260v Dirt Bike 2021
Replies: 37
Views: 1269

Re: 260v Dirt Bike 2021

Wouldn't there be less current draw? Yes, but so what. If you ust take the same battery and divide it into 4 65V packs and put them in parallel required for the same power at 4X the current. With the packs paralleled at the cell level the battery will be under the same stress, but will arguably be ...
by John in CR
Mar 21 2021 10:46am
Forum: Motor Technology
Topic: Hub motor rewinding, what thickness of enamelled copper wire?
Replies: 25
Views: 978

Re: Hub motor rewinding, what thickness of enamelled copper wire?

If you overheated a motor already, then the only way to get better performance is to increase cooling, change how your ride to make less heat, and/or include temperature sensing so your controller will automatically cut back current at a given motor temp and cut power completely if temps continue t...