Author Topic: CNC'd Motorcycle frame - V twin  (Read 6799 times)

Offline Brass_Machine

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CNC'd Motorcycle frame - V twin
« on: April 15, 2009, 11:23:39 AM »
Guy in Australia is building up a neat bike. FFE (funny front end), CNC'd frame. The guy even machined up his own throttle bodies!

LINK You have to scroll down through the pictures.



Eric

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bogstandard

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Re: CNC'd Motorcycle frame - V twin
« Reply #1 on: April 15, 2009, 12:02:59 PM »
Looks very nice Eric,

But I have my doubts about the CNC'd frame being as rigid as the tubular one it looks like it is based on.

That is why tubes are used for framework, to impart rigidity for less weight.

Mind you, he might know a lot more than we do.


John

Offline Darren

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Re: CNC'd Motorcycle frame - V twin
« Reply #2 on: April 15, 2009, 12:10:30 PM »
It might be possible, hard to say from the pictures, that he's using the engine as the main stressed member. Most modern sports bikes do that these days.
Making the frame just something to bolt all the bits to.

You will find it a distinct help… if you know and look as if you know what you are doing. (IRS training manual)

Offline Brass_Machine

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Re: CNC'd Motorcycle frame - V twin
« Reply #3 on: April 15, 2009, 12:15:37 PM »
The engine is a stressed member in this case. The original frame for that engine is actually an aluminum twin spar. The other thing is that in race bikes, the stiffest is not always the best. Manufacturers are now building 'flex' into the frames.

It is a serious undertaking that he has been working on for several years. I think it is his 4th or 5th frame he has designed.

Eric
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Offline Brass_Machine

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Re: CNC'd Motorcycle frame - V twin
« Reply #4 on: April 15, 2009, 12:17:42 PM »
It might be possible, hard to say from the pictures, that he's using the engine as the main stressed member. Most modern sports bikes do that these days.
Making the frame just something to bolt all the bits to.



I am designing a frame for the same engine that Mario (this builder) is using. Mine is pretty much very minimal and used for suspension mounting etc...

Eric
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bogstandard

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Re: CNC'd Motorcycle frame - V twin
« Reply #5 on: April 15, 2009, 01:37:54 PM »
OK, I admit defeat, I am 30 years behind in bike design.

Bogs

Offline Brass_Machine

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Re: CNC'd Motorcycle frame - V twin
« Reply #6 on: April 15, 2009, 01:43:30 PM »
OK, I admit defeat, I am 30 years behind in bike design.

Bogs

Nah not defeat. Just something new  :smart:

 :D

Eric
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Offline John Stevenson

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Re: CNC'd Motorcycle frame - V twin
« Reply #7 on: April 15, 2009, 01:47:04 PM »
OK, I admit defeat, I am 30 years behind in bike design.

Bogs

Did you notice John it's got pump up tyres ?   :wave:

JS.
John Stevenson

bogstandard

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Re: CNC'd Motorcycle frame - V twin
« Reply #8 on: April 15, 2009, 04:22:39 PM »
Cheeky devil, at least mine had rubber tyres, not wood.


Bogs

Offline John Hill

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Re: CNC'd Motorcycle frame - V twin
« Reply #9 on: April 15, 2009, 05:46:09 PM »
If I ever build a motorcycle it will be a replica of the Scripps Booth Bi-Autogo


I would probably try for a better power to weight ratio and I would add power steering so that unlike the original someone would actually be able to 'ride' it!

One day............ :med:


Hmmm... think I like this picture better..
« Last Edit: April 15, 2009, 06:02:29 PM by John Hill »
From the den of The Artful Bodger

Offline sbwhart

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Re: CNC'd Motorcycle frame - V twin
« Reply #10 on: April 16, 2009, 01:40:01 AM »
Thats a very distinguished looking bike John  :headbang: :headbang: :headbang:

Stew
A little bit of clearance never got in the road
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Location:- Crewe Cheshire