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Posted by Ignoramus22545 on April 20, 2008, 3:56 pm
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> johnnytorch wrote:
>>
>>> When is it ok to use a straight tongue with side supports and when is
>>> it best to use an A frame with A frame coupler?
>>
>> A-frame tongue. All day long. I believe the angle is 50deg. Measure the
>> angle from a coupler off the shelf before you design.
>
> For the back-yard weldor the A-frame has the disadvantage of
> concentrating the load on the welds. The straight tongue, extended,
> relies more on the strength of the tongue itself.
>
> The straight tongue
>
> +-----------+
> | |
> | -----+---------
> | |
> +-----------+
>
> The A-frame:
>
> +-----------+`.
> | | `-.
> | | ,"
> | | ,-"
> +-----------+,"
>
> A hybrid would be my preference:
>
> +----------.=---------+
> | "--._ |
> | ""-.|
> | |""-.__
> | | "-.._
> | | __,-"
> | |__,-"
> | __,-"
> | __,-" |
> +-----------"---------+
>
Here's my own design
http://igor.chudov.com/projects/Homemade-Trailer-With-M105A2-Bed/02-Drawings/
It is a combination of both A and straight.
The final result had the tip of "A" a little closer to the towing eye end.
http://igor.chudov.com/projects/Homemade-Trailer-With-M105A2-Bed/05-Welding-Frame/05-Welding-Frame-0014.jpg.html
The sides are 2x4x1/8", the middle straight beam is 2x3x1/8".
This has an advantage of supporting the bed a little better and
distributing stresses.
i
> Bob
>
> BTW- ASCII art via JavE:
> http://www.jave.de/
> Please, no anti-Java rants
--
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Posted by Don Foreman on April 20, 2008, 6:23 pm
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On Sun, 20 Apr 2008 14:56:03 -0500, Ignoramus22545
>>
>
>Here's my own design
>
>http://igor.chudov.com/projects/Homemade-Trailer-With-M105A2-Bed/02-Drawings/
>
>It is a combination of both A and straight.
That's a good design. A for lateral bracing, cantilevered tongue for
tongue weight and pull.
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Posted by Ignoramus22545 on April 20, 2008, 10:33 pm
Please log in for more thread options > On Sun, 20 Apr 2008 14:56:03 -0500, Ignoramus22545
>
>
>>>
>>
>>Here's my own design
>>
>>http://igor.chudov.com/projects/Homemade-Trailer-With-M105A2-Bed/02-Drawings/
>>
>>It is a combination of both A and straight.
>
> That's a good design. A for lateral bracing, cantilevered tongue for
> tongue weight and pull.
Thanks Don. I changed it a little by the time I actually made the
frame, specifically, I moved the crossmember in the middle farther
back, to be right under the axle. I also moved the top of "A" to be a
little closer to the lunette ring.
My main reason for choosing this design, was a hope that if some of my
welds turn out to be bad, the trailer would not fall apart instantly
under some sudden stress. Even if all welds at the base of A failed,
the 3x4 would twist but it would not break, or so I hope. I think that
under normal conditions, the 3x4 takes most of the load.
It cost me more money and weight than a regular A, but, I hope, it
would one day save me from my own mistakes.
--
Due to extreme spam originating from Google Groups, and their inattention
to spammers, I and many others block all articles originating
from Google Groups. If you want your postings to be seen by
more readers you will need to find a different means of
posting on Usenet.
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Posted by Don Foreman on April 21, 2008, 12:41 am
Please log in for more thread options On Sun, 20 Apr 2008 21:33:31 -0500, Ignoramus22545
>> On Sun, 20 Apr 2008 14:56:03 -0500, Ignoramus22545
>>
>>
>>>>
>>>
>>>Here's my own design
>>>
>>>http://igor.chudov.com/projects/Homemade-Trailer-With-M105A2-Bed/02-Drawings/
>>>
>>>It is a combination of both A and straight.
>>
>> That's a good design. A for lateral bracing, cantilevered tongue for
>> tongue weight and pull.
>
>Thanks Don. I changed it a little by the time I actually made the
>frame, specifically, I moved the crossmember in the middle farther
>back, to be right under the axle. I also moved the top of "A" to be a
>little closer to the lunette ring.
>
>My main reason for choosing this design, was a hope that if some of my
>welds turn out to be bad, the trailer would not fall apart instantly
>under some sudden stress. Even if all welds at the base of A failed,
>the 3x4 would twist but it would not break, or so I hope. I think that
>under normal conditions, the 3x4 takes most of the load.
>
>It cost me more money and weight than a regular A, but, I hope, it
>would one day save me from my own mistakes.
Part of why it's a good design: it factors in the process used. We
are not professional welders with a million miles of bead behind us.
It's always better to underestimate our welding skill than to
overestimate it. We'll probably be right more often than not.
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Posted by Jim Wilkins on April 20, 2008, 8:52 am
Please log in for more thread options > When is it ok to use a straight tongue with side supports and when is
> it best to use an A frame with A frame coupler?
I made an extended hitch for my garden tractor that moved the ball far
enough back to let the straight tongue of the trailer clear the rear
wheels of the tractor when they are at right angles to each other.
This lets me turn very tightly deep in the woods, where I should be
logging right now instead of wasting time on the computer.
Jim Wilkins
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