drop down to a smaller chainfall... one ton (2000lb) is probably lots for most motors or anything else you would want to move.....redesign from there! u will find your beam sizes much more affordable...anything bigger then that use your loader bucket or another piece of machinery..i cant see it being a regular occurance. just my 2 cents
Bridge Crane designs and ideas...38' span
- Thread starter LD1
- Start date
CNC Dan
Veteran Member
Have you considered zigzag cutting the web on a beam, offsetting it and re-welding, to make a taller, stiffer beam than what you started with.
cellular castellated beams - Google Search
cellular castellated beams - Google Search
OP
LD1
Epic Contributor
That looks like a TON of work. I would rather just take two beams and stack them I think.
Industrial Toys
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I knew someone that built one with about a thirty foot span. He had be problems in the rod that drove the wheels acting as a torsion bar and so one side would outdrive the other and the thing would get jammed up. I don't remember how they fixed it but it was a giant PITA.
Just something to think about.
I would love to have a bridge crane. That's about the nicest toy a man could ever have!
Just something to think about.
I would love to have a bridge crane. That's about the nicest toy a man could ever have!
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LD1
Epic Contributor
If I did a manual drive with a chain and wheels, the drop chain would be in the middle. So the torsion effect would be balanced.
Bladehauler
Gold Member
Are You dead set on a bridge crane . Seems a good size forklift could fit the bill with a crane attachment off the forks . Might be cheaper in the long run .just my .02
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LD1
Epic Contributor
IF I can get a beam for ~$600-$800, thats all I need. I have everything else.
And not much to go wrong with a crane, and maneuverability is never an issue, or changing oil or other engine up keep.
ultrarunner
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The bridge crane at the shop had a geared wheel with a chain to move it... shop was 150 long in the assembly area.
CNC Dan
Veteran Member
It is a bit of work, but you would just make a template to cut a few feet, then reposition. And it wouldn't add any weight.
It would be quicker to just add a square tube to the top. Would help with torsional rigidity too.
RedNeckRacin
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LD, maybe I missed something but you said "It will have 12' of run, the a push-trolley on the 38' span" Why don't you turn the design and make the 12' span the bridge and put your posts in the other direction so that you can use smaller material all the way around??
Also, your deflection calculation is most likely going to control your beam design as long as their isn't a localized failure in the flanges of the beam due to the high point loading from the very small trolley wheels. Also, don't forget that if you have to much deflection center span, that the beam could potential rotate off the running gear at the ends or at the least bind it up. Also, don't forget to look at lateral torsional buckling when you get tall slender sections.
Also, your deflection calculation is most likely going to control your beam design as long as their isn't a localized failure in the flanges of the beam due to the high point loading from the very small trolley wheels. Also, don't forget that if you have to much deflection center span, that the beam could potential rotate off the running gear at the ends or at the least bind it up. Also, don't forget to look at lateral torsional buckling when you get tall slender sections.