my mini bridge crane
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  1. #1
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    Default my mini bridge crane

    I am trying to learn how to post pictures so I hope this works. I just finished building and installing a mini bridge crane to save my back when changing chucks and other assorted back harming activities.

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    Quote Originally Posted by bridgedog View Post
    I am trying to learn how to post pictures so I hope this works. I just finished building and installing a mini bridge crane to save my back when changing chucks and other assorted back harming activities.
    With the best of intentions to not lift anything over perhaps 50-80 lbs, the very fact that it exists is all too likely to mean that 'somebody, someday' will try a far heavier lift .. and fail the rig. With nasty side-effects.

    That adequate support is not visible AND verifiable at a glance means it may not exist. it isn't obvious that it can support even its own unloaded traveler.

    Happy to be wrong about that - but it is an a assumption that has kept me out of worse trouble.

    Bill

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    Just to add, it might be best to label/stencil the capacity of the system on the bridge rail, etc. Just as a reminder to someone else.

    The need to be very particular about overhead cranes to the point of nit picking every detail is because of the potential danger caused by a failure of the structure, etc. I don't think any of us would escape a hospital visit or worse on even a several feet long piece of 4" I beam falling on us....

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    When I built the shop the trusses were engineered for the rails to be suspended from them with additional king posts and trussing. The rails are good for 2000 lbs each at a three to one safety factor.
    The cross rail is good for 1950 lbs at the same factor. The hoist is 1/4 ton. I am a crane operator by trade and am currently running a 140 ton crawler with 190 feet of boom. It also could be overloaded and fail. Proper training and knowledge are needed for every lift no matter how small. I will be posting a weight limit on the unit.

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  6. #5
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    Quote Originally Posted by bridgedog View Post
    When I built the shop the trusses were engineered for the rails to be suspended from them with additional king posts and trussing. The rails are good for 2000 lbs each at a three to one safety factor.
    The cross rail is good for 1950 lbs at the same factor. The hoist is 1/4 ton. I am a crane operator by trade and am currently running a 140 ton crawler with 190 feet of boom. It also could be overloaded and fail. Proper training and knowledge are needed for every lift no matter how small. I will be posting a weight limit on the unit.
    Good news, all - and with your background, you would be among the first in line to know WHY I threw that flag with nothing in eye-shot but drywall and rails.....

    ;-)

    Bill

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    Red face

    I applaud your comments. I would have expected none less. When people ask how it is attached I just say SUPERGLUE

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  9. #7
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    ..When people ask how it is attached I just say SUPERGLUE
    LOL! I had a 'country cousin' who swore by leather.

    When challenged, he'd just look puzzled, go thoughtful, look down at the ground as if pondering.... finally raise his head and say:

    " But is HAS to be strong stuff!

    Leather holds an entire 2,000 pound BULL together, don't it? "

    Bill

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  11. #8
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    LOL I guess I will have to look into some leather rigging.

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    What size members did you use and where did you find flanged wheels for the end trucks?

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    The flanged wheels came from complete trolleys sourced from the unmentional horrible store. It was far cheaper than any individual wheels I found anywhere else. I also should say since that picture it has all the weight limits posted on the crossbeam and hand pendant. The old hoist is only a 1/4 ton so even maxing out the hoist which is far more than 500 lbs it is still well within the rails and crossbeam capacity.

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    Very nice! I love my bridge crane!


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