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Homework Help: Need help to calculate torque

  1. May 2, 2014 #1
    I am trying to solve a problem.

    I want to try to calculate the torque needed to make a crane move on rails.
    I attached simple drawing of a crane. i want to calculate torque needed for each one of the four wheels so i could try choose proper electromotors and reducers.

    I don't need exact calculations, i want some guidance at how it is calculated.

    P.S. sorry for my English, not native language but trying hard.
    P.P.S. dimensions in drawing are in mm.

    Attached Files:

  2. jcsd
  3. May 2, 2014 #2


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    Staff: Mentor

    Hi Bronka. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif [Broken]

    I don't think you can arrive at a reliable figure, due to lack of data. When travelling at a steady speed, the driving torque is entirely dependent on friction (and also wind/air resistance, in light of the significant size of the structure). But on top of this, to give the crane an acceleration from standstill, you will need extra short-term torque. It's 10 metres tall, is it?

    A very practical person with experience of large cranes would be able to give a reasonable estimate, but this would be based on his experience, rather than data.

    In short, not enough information! http://physicsforums.bernhardtmediall.netdna-cdn.com/images/icons/icon6.gif [Broken]
    Last edited by a moderator: May 6, 2017
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