frame tube size

[Plasticpig]

Turbo.
I don't particularly agree with you, the same as sometimes I tut over some other posts, but I have learnt my lesson from when I first started going on forums.

 I made a couple of trike frames out of sched 40, and later sched 80 pipe, and was told in no uncertain terms that I was wrong. It got to the stage where I was slagged off on every bike forum I went on, and in the end I stopped going on them. It was only when I found out that Chris Ireland, and later on Andy Mankey used the same stuff. That is why there is a gap in my membership on here and a couple of other places.

[zakboy]

i think turbomangler, this is getting so boring,i think Steve knows the point i was making and on that note i think the decent thing to do is allow Steve to have his thread back and use it for the purpose he put it hear for in the first place, so with (my) dummy still firmlly in my mouth i think steve can make his own mind up on comments made so far.zak  

[Brant]

hi ok getting to the point now where i need to start thinking of a frame so what tube size do people use i was thinking of using big tube diameter tube like 42.4 with 3mm wall buying bends of certain degrees off ebay and using 36mm 3mm wall tube as joiners anyone tried that sort of kit style frame build? 


ta newbie steve

Whilst your 3mm wall thickness might be fine I suggest tube size is dependent on the size and kind of load being applied and perhaps it is dangerous, or in some cases over-the-top, to generalise on sizes.

Purely out of interest can someone tell me what a typical bike frame wall thickness might be (I've never cut into a bike frame tube)?

[Plasticpig]

The few I have cut up were between 1.5 and 2mm wall. The japs have probably spent millions of yen (£2.50)
on frame design and know what to get away with.
Look up Frame design by Tony Foal. That will give you some idea.

[tbone]

      

[terry t]

     

behave yourself tbone.

[terry t]

Hi turbomangler.i dont think any one is disputing the fact about how your frames are built or andys.tbone.and any one else that have built designed and built.the point as you say to this forum is.
as you know. some one asked a question or has an idear and gets an answer back at the end of the day if they use it or not its up to them what rout to go down. and not to impose our views on then   

[zakboy]

i think turbomangler what was intended as debate, you appear to have taken personally, my comments were not aimed at anything else but the first few words of your input to Steve's idea, as a newbie my self i put my self in Steve shoes,if this had been a posting on my thread i think the words (this is the worst idea i have ever heard) could have knocked my confidence to the point i could have felt stupid, and probably not wanted to post again or aired my project on the forum, it as nothing to do with your ability's or your work already aired on the forum I'm sure your input is valued and will continue to be valued, i think in short a little more tacked in your wording would go a long way to your advice being more appreciated, we are not all professional on hear some of us have never done any thing like this before, so we look to the more experienced amongst you for guidance. zak

[morrag]

With the amount of wordage this thread has generated it is obvious that there is definitely " more than one way...." to skin the proverbial! however, it might be as well to remember that successful chassis/frames, both 3 and 4 wheeled, have been constructed from large diam. tube, small diam. tube,thick wall, thin wall tube, and even marine plywood! its the attention to construction that is usually the mitigating factor, so..... you know what you have to do, 'and just be carefull out there',and guys how about using "spell-check", it makes these items so much easier to read for old 'Geezers' like me!.....Morrag

[BikerGran]

Remember amateurs built the Ark, professionals built the Titanic!!!

[zakboy]

lol, i like that bikergran

[steven brock]

hi thanks for all the comments i was gonna use this guys bends on ebay http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=290441737731&ssPageName=STRK:MEWAX:IT in various angles and buy 36mm tube (3mm wall)so i can cut for the joiners so a 3mm wall tube with 42.4 diameter with 3mm wall so leaves 36.4 internal size to bang the joiner in. this way i can experiment with tube and angles etc or buy a 16 (12ton) hydralic tube bender as already suggested.. just bouncing ideas off people...want the frame to be a nice feature as a lot of trikes i have seen look a bit reliant looking also toying with the idea of renault 5 gt engine converted to rwd using a mt75 transit gearbox should be interesting to build... happy new year

[zakboy]

happy new year to you steve, and all the best with your project.zak

[steven brock]

ok... anyone have an idea of frame width for the two bottom rails?thinking that if the bootom rails are as wide as the alternator from center line would that sound about right??

[terry t]

how many inches (or mm) is that then