Can downward pressure split a 2 x 4?

[John Doe]

There's nothing in the question that suggests it's a homework problem.

Maybe I should be flattered for apparently defining the problem well enough to make the question look academic.

Troll.

Jakofalltrades webtv.net (J T) wrote:

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[John Doe]

My question was so well defined/specified that it was well discussed and very clearly answered. Much appreciated. I'm delighted.

A sarcastic, semantics game play> Path:

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[mac davis]

yes, but not right away...

mac

Please remove splinters before emailing

[phorbin]

So what is the application anyway?

I'd guessed from your example that you were doing something with weights (as in barbells and dumbells) and thinking serious kilogrammage.

If so, I don't know about anyone else, but I'd cross reinforce it.

Frankly, I hate questions that leave out the application.

Knowing what weight will cause a 2x4 with a pattern of holes to fail may be interesting, but knowing, that you will use a pair of the boards to store assembled barbells of 50 to 500 lbs up to a total of x lbs. is important because you, or others may drop one of them onto the rack... and cause it to fail.

Knowing if the board will be vertical or set back at an angle is also important because the weight will be transmitted differently.

etc. etc. etc.

[Tom Banes]

Wow!

A lucid response to an inane question. I am impressed.

Well done!

Regards.

Tom

[Joe Barta]

Almost sounds like you're making a pair of stilts. I don't know the answer to your question, but if you *were* making stilts I can tell you that TWO 5/16" bolts per foot ledge seemed to hold well for all the kids that walked around on the various pairs of stilts that I made.

Joe Barta

[– Colonel –]

Yes, Virginia, downward pressure can split a 2 x 4.

That's what they make axes for.

[John Doe]

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[John Doe]

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[John Doe]

My favorite part of the replies is the general rule about the consequential/important distance from hole to hole, the answer being given as five times the diameter of the dowel hole.

Message-ID:

See you all later.

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[Pop]

: > I really need and appreciate the discussion. : : So what is the application anyway? : : I'd guessed from your example that you were doing something with weights : (as in barbells and dumbells) and thinking serious kilogrammage. : : If so, I don't know about anyone else, but I'd cross reinforce it. : : Frankly, I hate questions that leave out the application. : : Knowing what weight will cause a 2x4 with a pattern of holes to fail may : be interesting, but knowing, that you will use a pair of the boards to : store assembled barbells of 50 to 500 lbs up to a total of x lbs. is : important because you, or others may drop one of them onto the rack... : and cause it to fail. : : Knowing if the board will be vertical or set back at an angle is also : important because the weight will be transmitted differently. : : etc. etc. etc.

And unless I missed it, not a single person has yet mentioned that you'll very seldom find a 2 x 4 of any length where the same grains at one end appear at the other end. When we were testing benches, there were two split mechanisms expected: One where the wood bowed north/south first, and the other where it'd bow east/west first. Occasionally the first split to occur would be longitudinally the whole length, but not often. When that occurred, it was anyone's guess which way the bow would progress before the break started. Also, a sharp blow is much more likely to break the wood, where a steadily increasing pressure reached a much higher pressure psi. Vibrations set uip by a shapr strike are much more damaging to the structure than constantly increasing pressure. It's a whole science in itself. And then you get into angular displacements, as in someone leaning back on a bench... . Credit Hammond Organ for this part of my experineces. It was fun, but not as much fun as the later earthquake testing on rollers and shakers.

Pop

Pop

[J T]

Thu, Jan 26, 2006, 5:04pm (EST+5) [e-mail] (John=A0Doe) doth say: There's nothing in the question that suggests it's a homework problem. Maybe I should be flattered for apparently defining the problem well enough to make the question look academic.

Sure there is - what suggests homework is because it's pretty similar to other questions from students wanting to get out of doing their school work - college freshmen usually. So, don't be flattered..

JOAT You only need two tools: WD-40, and duct tape. If it doesn't move and it should, use WD-40. If it moves and shouldn't, use the tape.

[J T]

Thu, Jan 26, 2006, 10:43pm (EST+5) [e-mail] (John=A0Doe) deigns ro respond: Troll

Sigh. Looks like I was right. Just another sad, dorky, troll. Why else responses like that? Sigh.

JOAT You only need two tools: WD-40, and duct tape. If it doesn't move and it should, use WD-40. If it moves and shouldn't, use the tape.