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1. ### How does a crane work?

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. ### How would I replicate the motor and switch from the robotix toys?

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

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

3. ### Is space frame on a building the superstructure?

...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. ### I'm trying to calculate the crane boom load acting on the hydraulic lifting ram cylinder.?

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. ### would 2 500 ton crawler cranes be able to lift a 854 ton bridge section 80 feet in the air?

...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. ### Cranes can be overturned as a result of unknown load weights.?

... 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. ### Mechanical Engineering Senior Project idea's?

...: - 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. ### Where are gears used on a crane?

...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. ### How do they get those big tower cranes down after they set it up at a onstruction site?

... 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. ### Construction question?

...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