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Author Topic: Building a Mini Truggy need help deciding tube thickness  (Read 5729 times)

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Building a Mini Truggy need help deciding tube thickness
« on: February 17, 2009, 10:22:03 PM »
Hey,  Im building a Mini truggy. Im using a 1980 Gs1000 shaft drivin engine mounted in the front and im going to be building a 4 link in the rear using a 2wd toyota mini truck rear end. My question is what tube thickness would be best. Im using just mild seamed tubing, i was thinking .120 but would .095 work ok? Im doing this on some what of a budget. Ill try and get some pics its just a chalk drawing on the floor right now  ;D  I hope to start this build on friday.
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Offline Punkur67

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #1 on: February 18, 2009, 01:37:42 AM »
1-1/2 .095 mild is fine. Built my first car with it with no probs. just make shure you build your frame strong .
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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #2 on: February 18, 2009, 04:01:04 AM »
Punk's right .095 wall should be plenty as long as you use good triangulation,
There are a couple of good threads here on it
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Offline fabr

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #3 on: February 18, 2009, 06:03:05 AM »
You MIGHT want to use .120 at highly stressed points like tubes where suspension mounts go otherwise .095 should be fine. Good practice is to use thinner wall wherever you can and thicker where necessary.
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Offline fabr

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #4 on: February 18, 2009, 06:06:20 AM »
Also webbing/triangulation brace tubes can, and should be many times, of a smaller diameter .
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Offline Yummi

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #5 on: February 18, 2009, 06:49:06 AM »
Quote from: Masterfabr on February 18, 2009, 06:06:20 AM
Also webbing/triangulation brace tubes can, and should be many times, of a smaller diameter .

Why?
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Offline fabr

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #6 on: February 18, 2009, 06:57:07 AM »
Why? Are you serious?  I guess you are or you wouldn't have asked huh? The diagonals many times are for structural rigidity and a smaller/thinner tube will provide ample ability to do so at a weight savings. Look closely at a well designed tube structure and you will see main tubes that actually carry the loads are massive but webbing becomes progressively smaller as the spans/loads become less and less.
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Offline Yummi

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #7 on: February 18, 2009, 07:05:35 AM »
Thanks, yes, I was serious
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Offline fabr

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #8 on: February 18, 2009, 07:12:59 AM »
Did I help with that answer at all?
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Offline fabr

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #9 on: February 18, 2009, 07:14:11 AM »
Go to the mall and look at the steel support trusses.Whether tube of some other shape you will see what I'm talking about.
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Offline Yummi

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #10 on: February 18, 2009, 07:31:25 AM »
Quote from: Masterfabr on February 18, 2009, 07:12:59 AM
Did I help with that answer at all?

Yes.  I sometimes have tunnel vision.  In this case my thought process would be why have the different (smaller) sizes if the goal is strength.  It seems to me that the tube diameter does more for strength than the wall thickness.  But, then comes that pesky weight issue.  So, my tunnel vision forgot about weight. 

Could you not obtain the same or greater benefit from using the same dia and lighter wall on the cross braces potentially at a greater weight savings?  It just seems to me that the greater surface area for the point of adhesion to the main load tube would transfer more load than a smaller dia pipe used for cross bracing.   There is clear potential benefit in large scale applications such as trusses at the mall but in this application where the brace is of nominal size and the material is fraction of the total cost vs the labor, it seems there would be no real benefit to reducing the size of the tube for the cross bracing or webbing. Even the weight savings would be nominal in my mind.   
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Offline fabr

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #11 on: February 18, 2009, 09:11:22 AM »
Weight is weight and any reduction is more beneficial than adding HP
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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Offline Boostinjdm

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #12 on: February 18, 2009, 09:15:38 AM »
Quote from: Masterfabr on February 18, 2009, 09:11:22 AM
Weight is weight and any reduction is more beneficial than adding HP

Some people get carried away though.  I've seen racers go to great lengths to gut cars to lighten them up and then I can't stop from laughing when the 325# driver waddles up and tries to get in.  Passing on a few cheeseburgers would have saved a lot more weight than the couple of afternoons they spent trimming every last bit of metal out of the doors and hood.
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Offline fabr

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #13 on: February 18, 2009, 09:18:35 AM »
Usually the webbing serves no purpose other than to stiffen load bearing members. It takes much less strength to do that.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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Offline fabr

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Re: Building a Mini Truggy need help deciding tube thickness
« Reply #14 on: February 18, 2009, 09:19:16 AM »
Quote from: Boostinjdm on February 18, 2009, 09:15:38 AM
Some people get carried away though.  I've seen racers go to great lengths to gut cars to lighten them up and then I can't stop from laughing when the 325# driver waddles up and tries to get in.  Passing on a few cheeseburgers would have saved a lot more weight than the couple of afternoons they spent trimming every last bit of metal out of the doors and hood.
LOL!!! yeah me too but that driver needs all the help he can get.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"
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