Making a stainless steel pocket bike

[daz71]

Good thort gadgit it was going to be adjustable but its being made exactly the same as ( wheel base, footpegs, and seat height) my gp3 rep , i like the way it handles and feels and i want to keep all my bikes the same .
Also my old b1 frame will be chopped for a mod 49cc datona motor.
Whats your wheel base on your gp3 mini measure . I will have to come over one day and have a go . lol

[schrodingers cat]

You might get away with it and I may be overly anal about these things but S/S has a nasty habit of workhardening and cracking esp when subjected to vibration.
I hope I'm wrong cause with the short lengths and the design you're using it may be 'over engineered' and this isn't an issue.

S/S has loosely the same mechanical propeties as medium tensile steel so its worth trying (cheaper than Chro-Mo)

S/S is extremly low carbon steel, chromium and some other stuff. It is suseptible to contamination and carbon precipitation. As you weld the alloyed metals seperate and the weld area becomes carbon enriched (despite the very low carbon content - less than 0.3% off the top of my head)

If you can get access to an electropolisher you would be able to passivate the welds and reduce the carbon concentration in the weld and reestablish the parent metal properties.

As I say, good on you and I sincerly hope I/m wrong about the cracking

[daz71]

Yeah mate whoa you just done my head in lol, i am using 304 grade it will be fine might have the odd repair if i come off, oops when i come off lol.
I didnt learn to weld off you tube ha ha !!!!!!!

[schrodingers cat]

Is it worth some 0.9mm fishplates around the headstock to take divert the load paths?

Yeah I did see the brilliant suggestion. Personally I'm intersted in quantum physics and I'm avidly scouring UTube so I can build my own hadron collider with some good old kiwi No8 horseshit...

[daz71]

I just watched LHC on youtube thats heavy shit i think ill stick with horseshit i can understand that.lol
Unless you can make a real small version of it then i will run a bike on it .

[schrodingers cat]

Promise that as soon as I can harness the power of a black hole I'll give you first option on the engine I will develop. All that energy in a small package will be perfect for a pocketbike

[Gadgit]

Whats your wheel base on your gp3 mini measure . I will have to come over one day and have a go . lol

Shoot I'll have to go mesure the two bikes again lol. The only difference in lenght is in the rear arm and off the top of my head was 25mm but I'll check that out next time I'm down at the shed... Happy to let ya rip on the Duke but keep in mind she bites compaired to a rep lol

[imdying]

No matter which way you cut it, it's gonna be awesome! Will you make another to order and $$$?

[{.bLanK}G_o_D]

Promise that as soon as I can harness the power of a black hole I'll give you first option on the engine I will develop. All that energy in a small package will be perfect for a pocketbike

Ooo I wonder how that will go against our falling cat and buttered toast powered minimoto.

[onearmedbandit]

Hell yes, looks very tasty.

[daz71]

No matter which way you cut it, it's gonna be awesome! Will you make another to order and $$$?

I will think about it when i finish all my projects will let you know lol

[daz71]

Just an update on my bike, so far i have setup motor mount, radiator mount and front steering yeah.!!!!!!!

[schrodingers cat]

Ooo I wonder how that will go against our falling cat and buttered toast powered minimoto.

Obviously the strength of yours will be in its ability to turn quickly. It will be the race of the century!

[CookMySock]

S/S has a nasty habit of workhardening and cracking esp when subjected to vibration. [....] I sincerly hope I/m wrong about the cracking

Unfortunately I think you are right. Stainless steel is avoided in larger built-in marine fuel tanks for the same reason.

I have had one frame "go" on me, and it clean snapped in two in the blink of an eye. It had a fat bastard riding it though.

Steve

[daz71]

Dude ive made heaps of stainless tanks for big boats ,cars and trucks, the only difference is cost and personal preference.