[Kartbuilding] Rear axle

Thu Jul 8 00:04:00 IST 2010

Hi Maxime,

Them wheels with the metal hub look good, although a little costly as 4
x €30 (we're Euros here too in Ireland). Perhaps you could get a
discount for buying 4 together.
Anyway, it looks like there are roller bearings inside those wheels. See
the black insert.

In my opinion, for the rear wheels, you will have to remove this black
insert (roller bearing sleeve). I'm not sure what inside diameter this
will leave then (probably 30 or 35mm diameter. The website says 25mm
diameter, presumably with the black roller bearing insert).
You have two methods to attach the rear wheels.
1. The quickest is to weld the metal hub to the rear axle. If you want
to remove the wheels afterwards, you have to grind/file off the weld.
This is the method I used on my karts. I had an angle grinder which I
could easily remove the weld.
2. Seeing as you have access to a lathe, you can turn two flange pieces.
You can weld a stub axle to the wheel, and then a flange at the end of
this stub axle. You can bold/attach/put a keyway of the other flange
onto the end of the main axle. You can then bolt the two flanges
together. See the attached image.

For the Sprocket Carrier and Disc Carrier, you have to make the same
decision.
Will you be happy simply welding the carriers to the rear axle, or do
you want to provide a keyway as is done in professional go-karts?
The following images show how I welded the carriers and wheels to the
rear axle:
http://kartbuilding.net/gallery/v/Off-Road_Kart/DSC04620.JPG.html
http://kartbuilding.net/gallery/v/Off-Road_Kart/DSC04607.JPG.html
http://kartbuilding.net/gallery/v/Off-Road_Kart/DSC04705.JPG.html

Let me know if you will be happy simply welding the carriers to the axle
or not. This will then influence the rear axle and how it should be made.

P.S. You could use the wheels with the plastic hubs for the front
wheels. This will save you money. The front wheels need to spin freely,
and thus don't have to be fixed to the front stub axles. A simple split
pin and washer on either side of the front wheels will work. See:
http://kartbuilding.net/gallery/v/Off-Road_Kart/DSC04597.JPG.html

Also, one last question, what bearings are you going to use for the rear
axle. Do you have any in mind?
The pillar bearings on the following page would be the easiest method:
http://kartbuilding.net/Freeplans/axle.htm

I hope this information helps.

-steve

On 07/07/2010 18:40, Maxime Bossens wrote:
>
> Hi,
>
>  
>
> Thanks for your email!
>
> I have access to a lathe in the city, so I will visit them to get more
> info.
>
>  
>
> This are my wheels (not bought yet)
> http://www.tente.be/EN/cat330/am2978_wielen.html
>
> price is 30€ (around 37$).
>
>  
>
> On my first kart I had these one:
> http://www.tente.be/EN/cat330/am2949_wielen.html (10€ = 15$)
>
> But the rim was plastic and it was hard to connect them to the axle
> (we did it with screws thorugh the rim and metal, welded to the axle
> but it broke)
>
>  
>
> I just buy sprocket carrier and disc carrier from ebay for 25mm axle
>
>  
>
> Thanks in advance
>
>  
>
> *Maxime Bossens*
>
> /maximebossens.be <http://www.maximebossens.be/>/
>
>  
>
> *Van:* Stephen Burke
> *Verzonden:* woensdag 7 juli 2010 19:29
> *Aan:* Maxime Bossens; kartbuilding
> *Onderwerp:* Re: Rear axle
>
>  
>
> Hi Maxime,
>
> Thanks for your email.
>
> Yes, it is quite tricky to get the sprocket and its carrier attached
> correctly to the rear axle. It is the same with the brake disc.
> There are a few methods for achieving above. What method you will use
> will depend on what resources you have available.
>
>     * It is possible to make a rear axle. Do you have a Metalwork
>       lathe? Would you know anyone in a Machine Shop who could turn
>       the rear axle on a lathe for you?
>     * If you had access to a Lathe, you can get special carriers
>       turned for the sprocket and brake disc.
>     * Getting access to a Lathe would be the best way to complete the
>       rear axle with 100% accuracy.
>
>
> If you don't have access to a lathe, you can still make the rear axle,
> but you have to be very careful, otherwise it will not be a full success.
> What wheels do you have? This will govern the type of homemade hubs
> you will need to use.
>
> If you want, email me a photo of the wheels, sprocket and brake disc
> you have, and I'll do up some images on the parts you need to get or make.
>
> Best of luck,
> -steve
>
>
> On 05/07/2010 08:51, Maxime Bossens wrote:
>
> Hi,
>
>  
>
> I just built a kart, but it was not really a succes:
>
> Sprocketcarrier was not welded right on the axle (so it id not make a
> nice circle when turning the axle)
>
> Same with brake disc
>
> Bad solution on how to attach wheels to axle (all wheels had bearings..)
>
>  
>
> So before I start to build a new one, I wanted to ask you some questions:
>
>  
>
> Is it possible to make the rear axle myself? How can I make it good?
>
> How can I attach wheels to it? (I don’t want to buy wheel hubs of 40$
> each..)
>
> How can I weld the sprocket carrier so it turns in a nice circle
>
>  
>
> Thanks
>
> Maxime
>
>  
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.burkesys.com/pipermail/kartbuilding/attachments/20100708/2410b29a/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: attach-rear-wheels-to-axle.jpg
Type: image/jpeg
Size: 62212 bytes
Desc: not available
URL: <http://lists.burkesys.com/pipermail/kartbuilding/attachments/20100708/2410b29a/attachment.jpg>