Subject:
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Re: ok, quick question about crane lifting lines...........
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 28 Jun 2004 00:15:36 GMT
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Viewed:
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2475 times
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In lugnet.technic, Thomas Avery wrote:
> In lugnet.technic, Max Maxwell wrote:
> > What's the reason behind "parting the line" on the line that lifts the hook on a
> > crane? I see this is mostly done with fairly large cranes (crawler cranes
> > especially).
>
> The more lines you have, the less force there is per line. Check this out:
> http://science.howstuffworks.com/pulley.htm
A trade-off (related to line length) that site doesn't mention is speed -
increasing the number of lines means operating the hoist is slower - a 10 line
hook will take 10 times longer to raise and lower than a single line. That is
the reason many heavy lifting cranes have multiple hoist lines - multiple line
for heavy lifts, and single line (much faster) for smaller lifts.
ROSCO
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