Subject:
|
Re: ok, quick question about crane lifting lines...........
|
Newsgroups:
|
lugnet.technic
|
Date:
|
Mon, 28 Jun 2004 00:15:36 GMT
|
Viewed:
|
2593 times
|
| |
|
|
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
|
|
Message is in Reply To:
3 Messages in This Thread:
  
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
