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Old 04-18-2012, 12:04 PM   #16
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Which beam is stronger?


All this for a swing set? How much do your kids weigh? First define the span and the weight on it, THEN size the beam. If in doubt, hang a 2x6 across the desired span and YOU hang on it. If that bends greatly, try a 2x8. I think you'll find that two 2x10's and a 4x6 are gross overkill. Are you using aircraft cable to the swing seat, rope, or chain? I'd be more worried about that than whether or not you need two or four 2x10's. Something has to support this beam, remember, so beef up the legs accordingly.

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Old 04-18-2012, 07:46 PM   #17
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Which beam is stronger?


I was going to use the standard 4x4 post, A frame with 2,2x6s holding up the weight. Is that sufficient for 3, 2x10s or 2x10s (the 4x6 sandwich)?

Thanks...kids are currently 40 and 50 lbs.....
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Old 04-18-2012, 08:24 PM   #18
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Which beam is stronger?


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Old 04-18-2012, 09:30 PM   #19
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Which beam is stronger?


Quote:
Originally Posted by D270 View Post
I was going to use the standard 4x4 post, A frame with 2,2x6s holding up the weight...
"Holding up the weight" ??? Do you mean a 4x4 post w/ 2x6 legs? I am not an engineer, but just for reference, a 2x4x9' stud, braced from lateral deflection (nailed to plywood, for ex), can support about 1750 lbs. A 4x4 will obviously carry more, probably by a factor of 2.2 or so. With 2x6 legs to keep the post from swaying, I would think the whole family could swing w/ reckless abandon. I'd make sure the 2x6 legs go well up the 4x4, and properly anchor everything into the ground. We used to get a pipe-constructed swing set to almost topple over if 3 of us swung in synch and got very high. I would surmise that the weak points will be the connections; I am not an engineer. Copy commercial swing sets' design of the A part, then go wider; overkill is our friend.
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Old 04-19-2012, 07:17 AM   #20
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Which beam is stronger?


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Originally Posted by Daniel Holzman View Post
But this is not a course in structural mechanics
Could have fooled me!!


Last edited by tony.g; 04-19-2012 at 08:10 AM.
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