Plans for a 5 ton capacity engine hoist?

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Wondering if anyone has ever seen plans for an engine hoist style shop crane that could lift 5 tons? I only see 2 ton hoists and the high cap hoists I'm finding are usually A-frame styled chain hoists..."...My pappy was a pistol I'm a son of a gun...""...God is great, beer is good, and people are crazy..."
Reply:Like a gantry?http://www.all-lifts.com/Last edited by tanglediver; 04-09-2010 at 01:15 AM.City of L.A. Structural; Manual & Semi-Automatic;"Surely there is a mine for silver, and a place where gold is refined. Iron is taken from the earth, and copper is smelted from ore."Job 28:1,2Lincoln, Miller, Victor & ISV BibleDanny
Reply:What did you have in mind for a ram?  Getting a ram with that much capacity and a long enough lift might be the challenge.
Reply:Nope, like an engine hoist."...My pappy was a pistol I'm a son of a gun...""...God is great, beer is good, and people are crazy..."
Reply:Originally Posted by dstevensWhat did you have in mind for a ram?  Getting a ram with that much capacity and a long enough lift might be the challenge.
Reply:Ouch.. lets pretend that the top arm of that engine hoist is five feet long, and the hydraulic cylinder hits the top arm 1 foot away from the pivot... that means if you have a 10,000 lb load on the end of a five foot arm, the hydraulic cylinder has to have a capacity of 50,000 lbs (or 25 tons...)   and that's without adding in the weight of the top arm at all.. In actuality with a safety factor to ensure reliability, you'd probably need a 30 ton cylinder.  Do you have access to old construction equipment surplus?  I haven't figured out how large that top beam would have to be to resist bending.  Got the formulas for that around here somewhere...When you start to add the $$ up, there's a reason the A-Frame gantry chain hoists are around.  I do know there are a lot of very large surplus one arm jib style cranes for sale around here, but they require permanent installation.  good luck,zip
Reply:eh, then we get into hydro cylinders... I see what you mean zip, thanks for getting the numbers out. don't think 8 tons will do it . ah well, learning is a painful experience!"...My pappy was a pistol I'm a son of a gun...""...God is great, beer is good, and people are crazy..."
Reply:Maybe you should tell us what it is you are trying to lift.  Might get ya some better ideas.My name's not Jim....
Reply:Originally Posted by zipzitOuch.. lets pretend that the top arm of that engine hoist is five feet long, and the hydraulic cylinder hits the top arm 1 foot away from the pivot... that means if you have a 10,000 lb load on the end of a five foot arm, the hydraulic cylinder has to have a capacity of 50,000 lbs (or 25 tons...)   and that's without adding in the weight of the top arm at all.. In actuality with a safety factor to ensure reliability, you'd probably need a 30 ton cylinder.
Reply:I was thinking of a cantilever design as a secondary option but seem's like more work then it's worth really...Thanks guys."...My pappy was a pistol I'm a son of a gun...""...God is great, beer is good, and people are crazy..."
Reply:How about set it up with an adjustable height overhead arm with an electric winch suitable for lifting...  A snatch block pulley would give a decent lift on a smaller winch and slow it down for more finesse.