Search found 23 matches

by azad
Feb 26 2020 10:56am
Forum: E-Bike Technical
Topic: Why does Freewheel disassemble into parts?
Replies: 15
Views: 338

Re: Why does Freewheel disassemble into parts?

amberwolf wrote:
Feb 24 2020 1:31am
some systems use a sprag (roller) clutch, but it may require a redesign of axle and mounting hardware, and sprocket adapter.
Like the scooter clutch? I was thinking of remodeling on that lines but then it would be very difficult to adjust big scooter sprocket alongside crank-set and motor.
by azad
Feb 26 2020 5:04am
Forum: E-Bike Technical
Topic: How to disassemble motor adapter from sprocket/freewheel?
Replies: 12
Views: 337

Re: How to disassemble motor adapter from sprocket/freewheel?

OK, here is what I would do if you have no welder and how have the drilled holes: Get a small offcut of steel plate 6,8,10,12mm thick Drill a 1/2" hole in the centre and file square to take a socket wrench drive Drill and tap two threads corresponding to the drilled holes in your adapter Tighten do...
by azad
Feb 26 2020 5:02am
Forum: E-Bike Technical
Topic: How to disassemble motor adapter from sprocket/freewheel?
Replies: 12
Views: 337

Re: How to disassemble motor adapter from sprocket/freewheel?

you still haven't tried the one nearly surefire way to get it off: cut the freewheel itself. you use a dremel or similar, and cut thru the freewheel all the way to the threads. because of the adapter's flange, this will be difficult for the part that intersects it, and you'll have to grind the free...
by azad
Feb 24 2020 5:40am
Forum: E-Bike Technical
Topic: How to disassemble motor adapter from sprocket/freewheel?
Replies: 12
Views: 337

Re: How to disassemble motor adapter from sprocket/freewheel?

I guess the dynamic torque from your drive motor is doing it up very tight. Now you have two opposing slots can cut in the face, can you weld a large nut to a piece of flat steel inserted into both slots and use an impact wrench? I don't have a welder and wouldn't want to buy one for an adapter :) ...
by azad
Feb 24 2020 2:21am
Forum: E-Bike Technical
Topic: How to disassemble motor adapter from sprocket/freewheel?
Replies: 12
Views: 337

Re: How to disassemble motor adapter from sprocket/freewheel?

I assume you're trying to save the threaded adapter? Grip remains of freewheel in vice with soft jaws (or blocks of wood) and use a pipe wrench on the collar of the adapter. If you suspect a thread locking compound has been used, first heat the assembly to >100°C. If that doesnt work you have to ca...
by azad
Feb 23 2020 6:58am
Forum: E-Bike Technical
Topic: Why does Freewheel disassemble into parts?
Replies: 15
Views: 338

Re: Why does Freewheel disassemble into parts?

Freewheels are designed to overrun (rotate the outside relative to the inside) only when not under load-- when there's not significant tension on the chain. On a normal bike, that's the way it works. You pedal, the freewheel locks up, and the chain applies tension. When you stop pedaling, the freew...
by azad
Feb 23 2020 6:50am
Forum: E-Bike Technical
Topic: Why does Freewheel disassemble into parts?
Replies: 15
Views: 338

Re: Why does Freewheel disassemble into parts?

its notched for a shaft key way, are you using a key? is your shaft notched for a key? like a woodruff key? https://duckduckgo.com/?q=shaft+key+way&t=h_&ia=images&iax=images&iai=https%3A%2F%2Fwww.machinedesign.com%2Fsites%2Fmachinedesign.com%2Ffiles%2Fuploads%2F2016%2F01%2FKeyTypes.gif Yes there is...
by azad
Feb 23 2020 6:49am
Forum: E-Bike Technical
Topic: Why does Freewheel disassemble into parts?
Replies: 15
Views: 338

Re: Why does Freewheel disassemble into parts?

I can't tell from the pictures, but is is possible that the freewheel is experiencing some lateral forces due to improper chainline, acceleration induced flex, etc, that put force on it in a way it wouldn't normally experience? Perhaps exasperated by chain tension? Just spitballing. I had a go cart...
by azad
Feb 22 2020 10:10pm
Forum: E-Bike Technical
Topic: Why does Freewheel disassemble into parts?
Replies: 15
Views: 338

Re: Why does Freewheel disassemble into parts?

It is a standard single speed bicycle freewheel. It is not the thread direction issue. Somebody intentionally breaks it when I leave it unattended. I have replaced 3 until now and the same thing happened with each of them. the lid has counter clockwise opening and freewheel rotates clockwise all th...
by azad
Feb 21 2020 9:43pm
Forum: E-Bike Technical
Topic: Why does Freewheel disassemble into parts?
Replies: 15
Views: 338

Re: Why does Freewheel disassemble into parts?

It is a standard single speed bicycle freewheel. It is not the thread direction issue. Somebody intentionally breaks it when I leave it unattended. I have replaced 3 until now and the same thing happened with each of them. the lid has counter clockwise opening and freewheel rotates clockwise all the...
by azad
Feb 21 2020 10:03am
Forum: E-Bike Technical
Topic: Why does Freewheel disassemble into parts?
Replies: 15
Views: 338

Why does Freewheel disassemble into parts?

Hi, I have a single speed freewheel sprocket in the mid-drive setup (i.e. with a freewheel crank). The freewheel has an adapter attached to it for motor mount. Freewheel gets disassembled on the way while driving resulting in all the ball bearings scattered on the road. In the picture you see the di...
by azad
Feb 06 2020 9:28am
Forum: E-Bike Technical
Topic: How to disassemble motor adapter from sprocket/freewheel?
Replies: 12
Views: 337

Re: How to disassemble motor adapter from sprocket/freewheel?

Look. Sheldon Brown / Traditional Thread-on Freewheels https://www.sheldonbrown.com/freewheels.html I don't understand! I am not trying to open a freewheel. I have an "adapter" tightly screwed in the freewheel. In the picture you see one full freewheel with the adapter and one dismantled freewheel ...
by azad
Feb 05 2020 4:09am
Forum: E-Bike Technical
Topic: How to disassemble motor adapter from sprocket/freewheel?
Replies: 12
Views: 337

How to disassemble motor adapter from sprocket/freewheel?

Hi,

I have a sprocket with pre-installed adapter for motor shaft. I would like to take apart/disassemble the two (i.e. separate the sprocket/freewheel from the adapter). What is the most suitable way to do that? (already tried putting it in vise but it slips).
sprocket_with_adapter.jpg
sprocket_with_adapter.jpg (104.56 KiB) Viewed 286 times
by azad
Nov 30 2019 3:44am
Forum: E-Bike Technical
Topic: Why doesn't a li-ion battery take load?
Replies: 24
Views: 2021

Re: Why doesn't a li-ion battery take load?

Do you mean Ah where you've used amps by mistake? If so, maybe you got ripped off, sold crappy packs. New or used, which cells used? Link? Have you checked cell voltages? What charger? Yes it is Ampere hour. Yes the voltage are 4.3 at full charge. I am using 2x2A 36V chargers to charge each 10 batt...
by azad
Nov 30 2019 2:59am
Forum: E-Bike Technical
Topic: Why doesn't a li-ion battery take load?
Replies: 24
Views: 2021

Why doesn't a li-ion battery take load?

Hi, I've been using a 36V motor that draws ~13A current at peak. I initally used a set of three lead-acid (12V 12A) batteries in series. They had sufficient power to easily pull not only my weight but also payload of 10kg more. They gave me a speed of 35km/h at full speed. I have now replaced them w...
by azad
Nov 15 2019 2:46am
Forum: E-Bike Technical
Topic: Conversion of a e-bike into a trike
Replies: 5
Views: 734

Re: Conversion of a e-bike into a trike

Hodala here on ES has a thread about a kit that might work. THere are some European "trikes" that are built with narrow-spaced front wheel pairs. There is also a bike called the Juggernaut (a few threads here on ES talk about it) that uses two fatbike wheels on narrow-spaced interconnected forks. I...
by azad
Nov 14 2019 11:42pm
Forum: E-Bike Technical
Topic: Conversion of a e-bike into a trike
Replies: 5
Views: 734

Conversion of a e-bike into a trike

Hi, I'm planning on converting my bike into a trike. It is a standard 28" bicycle that I'd already converted into e-bike. I'm interested in a cost effective solution replacing/augmenting perhaps front wheel fork as back wheel has 7-speed shimano and could be much more complicated. I'm not as much in...
by azad
Oct 30 2019 9:02pm
Forum: E-Bike Technical
Topic: How to stop motor shaft nut from coming off?
Replies: 18
Views: 1085

Re: How to stop motor shaft nut from coming off?

This is how motor shaft looks.
by azad
Oct 30 2019 8:43pm
Forum: E-Bike Technical
Topic: How to stop motor shaft nut from coming off?
Replies: 18
Views: 1085

Re: How to stop motor shaft nut from coming off?

The shaft is right hand threaded. If it's on the right side of the bike, motor torque will be applied in in a way that tends to unscrew the nut. Usually, this tendency would be mitigated by the key keeping the sprocket from rotating on the axle. But it looks like you don't have a key on the motor s...
by azad
Oct 30 2019 8:39pm
Forum: E-Bike Technical
Topic: How to stop motor shaft nut from coming off?
Replies: 18
Views: 1085

Re: How to stop motor shaft nut from coming off?

Hi, The motor shaft nut comes off of sprocket and shaft rotates inside the sprocket without the sprocket being rotated. How can I stop the nut from falling off? Is the sprocket deeper than the one that came with the motor? It looks like the nut would usually tighten up against the shoulder of the s...
by azad
Oct 30 2019 8:38pm
Forum: E-Bike Technical
Topic: How to stop motor shaft nut from coming off?
Replies: 18
Views: 1085

Re: How to stop motor shaft nut from coming off?

Is there a key in that keyway? Is the shaft and sprocket tapered? As a first-try solution I'd thorough degrease all parts and use loctite on the threads. Blue is normal strength, red is much stronger but beware you'll need to apply heat if you ever wanted to get it apart again. I think there isn't ...
by azad
Oct 30 2019 8:55am
Forum: E-Bike Technical
Topic: How to stop motor shaft nut from coming off?
Replies: 18
Views: 1085

How to stop motor shaft nut from coming off?

Hi,

The motor shaft nut comes off of sprocket and shaft rotates inside the sprocket without the sprocket being rotated. How can I stop the nut from falling off?
by azad
Sep 20 2019 9:37pm
Forum: E-Bike Technical
Topic: ebike mid-drive DIY parts for MY1018
Replies: 2
Views: 308

ebike mid-drive DIY parts for MY1018

Hi, I'm in the process of building a mid drive bike and have realized it is not easy to acquire parts for it. Mainly, it seems that the manufacturers in China sell whole kits and refuse to sell individual parts. Specially, what I am looking for is the freewheel crank-set and motor bracket for MY1018...