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  1. Wheels let the trolley move along the jib. Rollers let the superstructure rotate. Pulleys let the load be raised and lowered.

    2 Answers · Science & Mathematics · 23/01/2007

  2. Try www.sciplus.com and www.herbach.com, two good surplus houses.

    1 Answers · Science & Mathematics · 09/01/2011

  3. ...steel struts. In many ways this looks like the horizontal jib of a tower crane repeated many times to make it wider. ...

    1 Answers · Science & Mathematics · 03/11/2010

  4. just treat it like a simple lever problem with an over hung load. then divide the area of the cylinder to get the pressure required.

    2 Answers · Science & Mathematics · 06/11/2007

  5. ...boom length of 275 feet, and up to 551 feet with a luffing fly jib extension.” There is a chart in every crane cab that will tell you what...

    2 Answers · Science & Mathematics · 28/01/2013

  6. ... Also the Boom angle is critical. And Jib length and por soil conditions under the outriggers. ie insufficient...

    2 Answers · Science & Mathematics · 23/04/2010

  7. ...: - hydraulic cylinder or a pump. - any type of crane (counterbalance or jib crane) - gearbox, velocity reduction unit, clutch, brake or anything of that type. - robotic arm...

    2 Answers · Science & Mathematics · 30/09/2010

  8. ...cable drum. 2. Gears to rotate the crane, or driving cable drum to extend jib. 3. If a mobile crane, gears to transmit drive to wheels/ ...

    2 Answers · Science & Mathematics · 11/03/2009

  9. ... people think they can handle larger loads than portable jib cranes. This is not the case. The advantage of a tower...

    2 Answers · Science & Mathematics · 07/08/2008

  10. ...for a new section. The new section is lifted in (or out) with the jib. See illustration @ http://science.howstuffworks.com/tower-crane5.htm...

    4 Answers · Science & Mathematics · 07/02/2008

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