[Kartbuilding] question about lawnmower powered wooden go-kart

[Stephen Burke]

Hi Jules,

Sorry for the delay in getting back to you.
Please find attached a PDF showing what I suggest. I have also attached
a 3D eDrawing, in a Zip file, to this email.

What I suggest is as follows:
See 1. on the PDF. You will have to cut 2 grooves into your output
shaft, using a (new blade) hacksaw and file.
See 2. on the PDF. Get some flat steel bar 20mm x 5mm around 80mm long.
Bend into an "n" shape, so it will fit into the groove made on the
output shaft.
See 3. on the PDF. Using a hacksaw and file, remove a single groove to
accommodate the bent "n" shape of metal.

Using a long bolt, tighten the lot together onto the end of the Engine
Shaft.
Using this method, there is no way the pulley wheel would rotate on its
own, and would be fully attached to the engine output shaft.

The above procedure is very similar to what I done for my kart. See:
http://kartbuilding.net/gallery/v/Kart_Clearance_and_Memories/DSC01217.JPG.html
http://kartbuilding.net/gallery/v/Kart_Clearance_and_Memories/DSC01214.JPG.html

http://kartbuilding.net/gallery/v/Kart_Clearance_and_Memories/DSC01070.JPG.html


Let me know what you think.

Thanks also for the photos. Please email on some more.
I have concerns about "100_0974" where the engine is shown on the rear
of the kart.
The engine it too high. The engines output shaft, where the pulley is,
should be lower down to the rear axle. See the attached image.

Feel free to email on some more images. It was many years ago when I
made my lawnmower powered wooden go-kart, and of course I didn't take
any photos!
Also, I'd like to put the photos on the kartbuilding.net gallery at
http://kartbuilding.net/gallery/v/OtherPeoplesKarts/  to help other people.

Let me know how the kart goes.

Best of luck,
-steve



On 26/07/2010 23:42, Julie Swanson wrote:
> Attached are some pictures of the drive shaft and pulley. I'm thinking
> of going and buying another pulley that doesn't have the thickness
> this one does (the knob on one side) but am also thinking I could
> hacksaw that off or wait and see what you suggest. I think the drive
> shaft is iron or steel, something that rusts has to have iron in it,
> right? A magnet sticks to it at any rate.
>
> I was thinking maybe I could cut the knob off the pulley and bolt it
> on (or try to find a thinner one w/o the knob; couldn't find one at
> the store that size) and then buy a thin drill bit that will drill
> into metal and drill at an angle through the pulled and into the drive
> shaft and then sink a thin finishing nail or metal pin in there and
> cut and file it off flush to the angled V of the pulley. Do you think
> that would work, 2 or three little pins like that?
>
> Thanks for taking a look at this.
>
> Jules
>
> ----- Original Message -----
> From: Stephen Burke
> To: Julie Swanson ,
> Sent: Mon, 26 Jul 2010 17:26:52 -0400 (EDT)
> Subject: Re: question about lawnmower powered wooden go-kart
>
>
>
>
>   
>   
>
>
> Hi Jules,
>
>
>
> If you could send on a few images of the drive shaft, that would make
> things easier.
>
>
>
> This 2" flat circle. Is is steel or aluminium?
>
> Could you drill into this 2" flat circle? I take it, that its 2"
> diameter. What thickness is it?
>
>
>
> If you could email on a few images, I can draw in on them the best way
> to attach a pulley.
>
> Also if you could take some images of the pulley wheel you want to
> attach I'll be able to explain more.
>
>
>
> -steve
>
>
>
>
>
>
>
> On 26/07/2010 20:02, Julie Swanson wrote:
>
>   
>
> My son and I are building a go cart according your websites plans
> (we're on drawing 17) and we're having a problem securing pulley wheel
> to engine output shaft. The notes given say that the author may be able
> to suggest some methods and options (we're hopeful; we've put a lot of
> time into this and a snag like this can't stop us now!). Our engine
> output shaft is just flat across the bottom, doesnt have anything where
> it would make sense to cut a groove or slot in the pulley wheel. Given
> that the output shaft is a cylinder with a flat circular base the bolt
> that holds the lawnmower blade goes into, we're not sure what we could
> do to keep the pulley from spinning independently of the output shaft.
>
>   
>
> Any suggestions as to how we could do this would be greatly
> appreciated. I'd send you a picture, but it's really nothing you can't
> envision by my saying that the base of the output shaft the pulley
> would be bolted to is just a flat circle about 2" in diameter, with a
> hole in the center of it that the bolt screws into--nothing else to
> describe. The engine is from an old Murray 22" push mower (3.5
> horsepower) if that helps; we bought it used ten years ago so it might
> be 15+ years old.
>
>   
>
> Thanks,
>
>   
>
> Jules
>

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