Jewel Bafang ?

[tepol]

Can any one tell me what the diameter of the axle is for this thing ?

I dont see any reference unless i missed it .

thanks

tepol

 

[mechaniker]

Can any one tell me what the diameter of the axle is for this thing ?

I dont see any reference unless i missed it .

thanks

tepol

the axle diameter on thread is 9,5mm outside, it is a BC-3/8"

regards
frank

PS: i want send you a technical drawing of the SWXK(jewel) but the attachment-function dont work since some weeks. anybody have an idea what i´m doing wrong? maybe i setup something wrong? when i go to the forum it has worked, maybe this function dont like me ;-)

 

[jbond]

My reading of UNIQUE——swxh series -Suzhou Bafang Electric Motor Science-Technology Co.,Ltd and JEWEL——swxk series -Suzhou Bafang Electric Motor Science-Technology Co.,Ltd is that they're standard sizes. 8mm and 10mm flats for the drop out width, 10mm and 12mm nuts, 100mm and 136mm drop out spacing, for the front SWXK and rear SWXH respectively.

 

[tepol]

the axle diameter on thread is 9,5mm outside, it is a BC-3/8"

regards
frank

PS: i want send you a technical drawing of the SWXK(jewel) but the attachment-function dont work since some weeks. anybody have an idea what i´m doing wrong? maybe i setup something wrong? when i go to the forum it has worked, maybe this function dont like me ;-)

Hi Frank,

I think I can see now that the thread is thicker towards the motor and less thick where it screw into the nut i.e. on the outside /furthest away point from motor

Is this what you mean by outside diameter ?

Or to put it another what bore size would I need to fit the axle ?


thanks

tepol

 

[mechaniker]

My reading of UNIQUE——swxh series -Suzhou Bafang Electric Motor Science-Technology Co.,Ltd and JEWEL——swxk series -Suzhou Bafang Electric Motor Science-Technology Co.,Ltd is that they're standard sizes. 8mm and 10mm flats for the drop out width, 10mm and 12mm nuts, 100mm and 136mm drop out spacing, for the front SWXK and rear SWXH respectively.

belief me, it is 3/8" this is metric outside diameter 9,5mm
if you look on the technical drawing you can read this "2-BC 3/8" for the axle diameter
As a bafang dealer i have the Motor here to check and also i have the technical documentation from Bafang SWXK here ;-)

maybe i make some photo on my website about this, as long i´m to stupid for the attachment it´s my only chance , wait i do it with some photo from axle and thread and torque washer


regards
frank

 

[jbond]

belief me, it is 3/8" this is metric outside diameter 9,5mm
if you look on the technical drawing you can read this "2-BC 3/8" for the axle diameter
As a bafang dealer i have the Motor here to check and also i have the technical documentation from Bafang SWXK here ;-)

Sorry, I'm getting it wrong.

It's a metric thread, right? With flats on the side to stop the axle rotating in the fork and to fit into a standard front fork dropout. Or is it a thread with no flats?

I really hate these mixed imperial measurements. I've been caught before with trying to fit EU 1" bearings in a US 2.54mm hole! A typical conventional front wheel uses an M10-0.1 thread I think. Or maybe not. Perhaps it's another of those bicycle insanities where it's a 3/8" USF thread that has been converted into a 9.5mm-0.99. It could be worse. It could be BSF or AN.

 

[mechaniker]

so , now i have it done on my website, Elektrofahrrad, pedelec zubehör

You only must scrool down, the last three picture is from swxk maybe this answer your question, i hope

Dont ask me why the chinese mixed mm and inch , i also relly hate and i belief there is no reason, the one who take responsibility for the thread maybe was an old guy and had learned to use inch and the one who design the motor was young has learned to use mm i have no idea

regards
frank

 

[flecc]

Dont ask me why the chinese mixed mm and inch , i also relly hate and i belief there is no reason, the one who take responsibility for the thread maybe was an old guy and had learned to use inch and the one who design the motor was young has learned to use mm i have no idea

regards
frank

Maybe it results from dealing with the USA and Europe and trying to please both Frank? As an engineer in Britain I've freely worked with both for many years, including mixing them. I do it all the time and find it an advantage, both Imperial and metric have their advantages in different applications and areas of life.

Conversation in tool hire shop:

Me: 5" masonry hole borer please.

Assistant: We only have them in millimetres.

Me, instantly: 127 mm.
.

 

[tepol]

belief me, it is 3/8" this is metric outside diameter 9,5mm
if you look on the technical drawing you can read this "2-BC 3/8" for the axle diameter
As a bafang dealer i have the Motor here to check and also i have the technical documentation from Bafang SWXK here ;-)

maybe i make some photo on my website about this, as long i´m to stupid for the attachment it´s my only chance , wait i do it with some photo from axle and thread and torque washer


regards
frank

I feel a bit stupid asking this but am I right in assuming flats is the term to describe axels that have been squared off i.e. so as you say they dont turn in the fork ?

To Frank ,

As crazy as this sounds - do you think it would be possible to screw a the jewel hub motor into my nova knee cruiser below ? ( see pics 13 /14 )

http://www.flickr.com/photos/28633046@N02/"

Or would i really need a the axle secured by nuts like in your typical bike frame / fork ?

Thanks,

tepol

 

[flecc]

am I right in assuming flats is the term to describe axels that have been squared off i.e. so as you say they dont turn in the fork ?

Yes. I'll leave Frank (Mechaniker) to answer your other queries.
.

 

[tepol]

Yes. I'll leave Frank (Mechaniker) to answer your other queries.
.

thanks Flecc

To Frank ,

Is that 28 mm bearing with ID of 12 mm that one you use in Jewel ? ( the far left one )

The thread for my bolt / axle is 9.5 , but the bearing I have is only 22 mm width with an ID thats maybe fraction bigger than 9.5 i.e. by 1mm i.e. 10.5 - 11 mm


tepol

 

[mechaniker]

Is that 28 mm bearing with ID of 12 mm that one you use in Jewel ? ( the far left one )

The thread for my bolt / axle is 9.5 , but the bearing I have is only 22 mm width with an ID thats maybe fraction bigger than 9.5 i.e. by 1mm i.e. 10.5 - 11 mm

Hi tetpol,

on the left side, diskbrake side is a a 28mm/12mm bearing if i remember right. but your idea dont work.
I had a look on your picture´s and i belief to know what you want do but i see no chance to do it this way.

it is more easy to design/modify your knee-cruiser new.
If i would like to do what you want do i would build the hub in the middle and use the right and the left wheel to keep the balance. I would build the forkarm for the motor a bit flexible because the angel you use the knee-wheeler is not always the same. So i would use a spring-mechanism

regards
frank

 

[tepol]

Hi tetpol,

on the left side, diskbrake side is a a 28mm/12mm bearing if i remember right. but your idea dont work.
I had a look on your picture´s and i belief to know what you want do but i see no chance to do it this way.

it is more easy to design/modify your knee-cruiser new.
If i would like to do what you want do i would build the hub in the middle and use the right and the left wheel to keep the balance. I would build the forkarm for the motor a bit flexible because the angel you use the knee-wheeler is not always the same. So i would use a spring-mechanism

regards
frank

Greetings Frank,

I know it would be too powerful , but what If I had 2 hub motors on either side of the rear wheels to sort the balance / power issue out , do you think it would work then ?

thanks

tepol