jib crane hoist swing boom planning and constructive advice

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babolottino said:
I have not yet started, I must get the material, however, thanks to the valuable suggestions, however I do not have to lift big loads I put as maximum capacity 500 kg, but I do not think that ever lift a load so heavy, it will be like a crane of what are built on the boats, a column a swivel crosspiece and a hoist with a diagonal tie rod to support the structure and the cantilever load, I do not know what is called in marine jargon a similar lifting frame, nothing mammoth to clarify, thanks again anyway if you have other advice, please, thank you

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https://publicqa.gorbel.com/images/...es/wb10077096c36eb6e608cbd72ff000019dfa3.png?

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http://shweibos.com/wall-mounted-ji...for-sale-jib-crane-services-jib-best-creative
http://www.cisco-eagle.com/catalog/...lbs-cap-14-boom-length-44h-w-38-in-air-supply


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Your design will work. I would have the cable angle steeper. Make the column higher so the cable is more than 45°. The column itself 8" square I assume is good for much more weight than you could get into a garage. I do not see a dimension for the lift arm, appears to be at least 6" high. Plenty strong. The last pic appears to be a solid member of round stock, other pics appear to be a cable. Either will do.
As long as the 5/8" plate is anchored well on the top , no danger of tipping over.

mike
 
thanks again for the collaboration and valuable advice, at some point I did not think I could mount the arm, I had many difficulties especially when I had to hook the chain and put everything to the level, one thing is to do it on the ground one thing is to do it only 3 meters high with a scaffold scaffolding unstable, I do not think that I will lift more than 200 kg, I have not yet lifted any load, if you believe should strengthen or make up for some error, I invite you to criticize my work thanks to the security first of all thanks again
 
Built one in my farm shop in late 70S after a trip to the states and visit to the Allis Chalmers marine factory in the quad cities area . Have not been back there since but they had them all around the factory . Mine mainly used over a pit for changing car engines ,Works a treat!
 
you would have a picture, just to make a comparison maybe to improve mine, I have not had time to test it I'm exhausted by fatigue, I did everything alone, I think 300 kg I can raise them safely, what do you say?
 
Before you test with a load that is a few inches off the ground I would change the chain hardware that you have selected. Shackles instead of quick links and the chain needs to be attached at both ends just in case the turnbuckle parts. The turnbuckle can take up slack but the slack may save you from injury if the chain has to take all of the load.

Just one more thought for your consideration.
 
right observation, thanks for the valuable suggestion, unfortunately in hardware stores in the area where I live there is not a great variety of products so I should order them, with very long delivery times, maybe I should go to some accessories store for boats and boating that are more provided, however thanks for the report, if you find other faults or you would have other valuable suggestions I invite you to write and to point out to them thanks again, you have been very valuable with your suggestions. thank you for your attention and your precious time


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I know well the hardware-store stocking problem when trying to build something at home. It seems all the places near me sell the same things and no variety, especially in quality.

In a lot of cases, at least in the USA, hardware stores and "home centers" sell hardware that is only suited for "utility" use, such as tightening up tension on swing gates or splicing together dog-run chains. Your idea to check marine suppliers sounds like a step up, but I would suggest looking at the products sold by full-fledged industrial suppliers and actually rated for lifting hardware use. I have had a cheap piece of hardware come apart in a horizontal machinery-moving situation and it was scary enough.

--ShopShoe
 
Consider a source for load binding equipment used in the heavy trucking industry. A chain holding down a back-hoe on a flat bed would do the job well for your jib crane. A farm supply store would also have what you need. Even at a local big box hardware simply moving up in dimensions to heavier chain and shackles that can be locked with wire will help a lot. A lever action load tensioner can take up the slack in the chain while leaving the chain always fully connected at the ends for last resort safety.

I think that you are now aware of my concern and will make the right choices.
 
DJP said:
I think that you are now aware of my concern and will make the right choices.
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I do not think so - what type of chain would he buy?
Without doing a minimum of calculation he would get the perfect wrong one.
Defining the maximum load is not sufficient!

I only hope, that he and nobody else will get injured.....

Thomas
 
miglincit said:
I do not think so - what type of chain would he buy?
Without doing a minimum of calculation he would get the perfect wrong one.
Defining the maximum load is not sufficient!

I only hope, that he and nobody else will get injured.....
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I have to agree Thomas. Has the OP or anyone else on here any idea what loads the chain is likely to see, especially at that angle. I shudder when I see he has used a simple turnbuckle with a screw gap carabiner and what looks like a snap hook on the end to tension the chain.
 
turn buckle is a bad idea................better put a backup in there.......................
 
miglincit said:
I do not think so - what type of chain would he buy?
Without doing a minimum of calculation he would get the perfect wrong one.
Defining the maximum load is not sufficient!

I only hope, that he and nobody else will get injured.....

Thomas
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My ending comment was for the OP to take responsibility instead of asking for feedback. The chain and turnbuckle was the first thing that I noticed as a problem waiting to happen so I pointed it out. If the OP visits the right industrial supply shop he will at least be asked the right questions.
 
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thanks friends of the right suggestions, thanks, unfortunately I had to use the materials that I found in the area, I live in a poor area with few resources, however I have a flat iron bar 50 mm x 10 mm thick 5 meters long, I could get a diagonal tie to be welded to the beam and on the hinge, I have to evaluate the thing well, however I have not tested the boom swing I did not have time but I will certainly consider your valuable suggestions I have to reassemble the scaffold scaffolding and evaluate the intervention to be done, thanks again I will let you know, if you notice any other "dangerous" error for my safety and my safety I invite you to csrivere, thanks again for your precious interventions thanks.
 

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