Need help solving small engineering problem

Hi,

I need a little help on figuring out what size square tubing and thickness I need to make a basic lift for taking the body on and off of a frame. I have included a small drawing of what I am trying to build.

I am going to need to support a maximum of 1000 pounds. All off the force will be vertical with no side loading.

The two vertical post will be bolted to the floor and attached to the ceiling. The distance between posts will be 7 feet. The load will be lifted directly in the middle of the horizontal tube.

Can you please help with what size square (or rectangle) tubing and thickness I need for the verticals and the horizontal to support this weight? Would it be better to use rectangular tubing for the horizontal?

I understand moments of inertia, Youngs modulus have to be figured in just having a little trouble.

Thank you

Nick

badharley99@yahoo.com

 

I have no idea bud...so i will bump it to get ya some help... good luck

 

The moment is PL/4 with a safety factor of 2, M = 2000(84)/4 = 42,000. Use bending stress of .6 x 36,000 = 21,600 so section modulus = M/fb = 2. A 4 x 3 x 3/16" is 2.47 http://www.steeltubeins***ute.org/pdf/brochures/dimension_brochure.pdf and 3x3 x3/16" legs should work. http://www.steeltubeins***ute.org/pdf/brochures/column_load_brochure.pdf

 

If I was fastening to ceiling I'd build it out of wood. A pair of 2x12's would have a section of 3x11.25^2/6 = 63.3 and SYP would have an fb of about 900 PSI so Mallowable = Sfb =57,000 and 4x4 posts

 

I'd just rest those 2x12s on the trusses in the attic/crawl space...damn I'm scary sometimes

of course I'd put one at the front of the body, and another at the rear

 

I would suggest adding some lapped gusset plates at the horiz to vert connections. Also, be sure the top of your frame is adequately braced out of plane. I know you said you were going to attach the verts to the ceiling and that there would be no side loading but you can never be too safe.

 

Damn engineer showing off all your fancy book learn'n

I'd probably just throw it on a couple of saw horses... then again I'm just a ****'n hillbilly!

 

You're just raising the body? Where did you get a model A that the body weighs a half ton?

If all your doing is raising the body the metel doesn't have to be any stouter than the ch***is. Your not building a sky s****er you're building a lift for the body. The ch***is holds it all the time and takes tremendous moment and live loads on a daily basis. Well depending on if you drive it or not.

 

thats what I was going to say.... damn

 

You mean I wasn't supposed to use my 7 and 8 year old kids to help me carry around my tudor?
In all seriousness I've used lift straps and hoists from the 2nd floor of my garage several times when moving car bodies. An actual lift would be great but it would take up too much room for me.

 

Two fir (no knots) 2X6 will do it.