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#1 |
diyAudio Member
Join Date: Oct 2006
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Hi,
My goal is to mount two 1" x 1.5" Aluminum Tubes to the back of my tv stand. A lcd wall mount would then mount to the tubes. the tubes would act like the studs in the wall. the wall thickness of the standard aluminum tube is 0.125". the bolts would go through both sides of the tube. My tv is about 45lbs. My question is if the aluminum is strong enough to hold this weight. It does not seem like a lot of weight for the aluminum but I could be seriously under estimating. I'm trying to avoid steel since it costs drastically more and much harder to work with. thanks! |
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#2 |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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Have you tried to bend 1/8inch wall rectangular aluminium tube of that size?
Without any maths, just put a 3foot length across your knee and see what gets damaged first. BTW, M/I=E/R=Sigma/y if you want/need confirmation.
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regards Andrew T. |
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#3 | |
diyAudio Member
Join Date: May 2005
Location: SoCal
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![]() Quote:
If they are longer, then sg steel would be advised. They are not that expensive unfinished, if you have a metal supply house nearby.
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#4 |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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Hi,
if the tubes are vertical then the length of the tubes is irrelevant to strength. Long tubes will deflect more due to the eccentric load and once they deflect they are no longer vertical. This will increase the eccentricity of the load.
__________________
regards Andrew T. |
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#5 | |
diyAudio Member
Join Date: May 2005
Location: SoCal
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Quote:
That's the theory but unless he balances a top heavy load (under all conditions) there will be a bending force. As for conditions using only 2 vertical poles is not too stable to begin with. So use a tripod structure or get more strength to bending.
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#6 |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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of course there is a bending moment on the vertical tubes.
It's eccentrcity * load. The length of the tubes does not enter that equation. Eccentricity does.
__________________
regards Andrew T. |
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#7 | |
diyAudio Member
Join Date: May 2005
Location: SoCal
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Quote:
since your civil I'll defer, but I'll bet the radius or length will be a factor.
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#8 |
diyAudio Member
Join Date: Oct 2006
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thanks!
I think the aluminum will work since the bolts will go through both sides of the tube. I bought some .75" sq. I'll be using steel washers on both ends so that should re-inforce it some more. bottom end will be bolted down to the metal frame of my tv stand. Now I'm wondering how many inches I can extend the mount forward since the tv is now towards the back of the stand. I'm going to look for 6' spacers if there is such and use long 1/4" bolts. I bought a flat lcd tv mount on ebay for $30shipping and the tubes were $22. It sure beats the $700 TV floor stand. The prices for those this are nuts! ![]() It will be nice to have the center channel higher up. Much better sound ![]() |
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#9 |
diyAudio Member
Join Date: May 2005
Location: SoCal
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If you are set on aluminium rods then use eyebolts for the 2 top mounts in the rear and then use heavier picture frame cable (pre loaded) to secure against the back wall for stability. Check for plumb.
IMO I would still check for steel sq stock.
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#10 |
diyAudio Member
Join Date: Jun 2002
Location: USA, MN
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Mountain bikes have wall thicknesses less than 1/32 inch in some cases and can withstand hundreds of pounds of rider jumping off an obstacle - the secret, very little bending moment.
As others have alluded to, it all depends on geometry. Sketch your design and someone can answer your question.
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Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley |
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