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Thread: Absorption of force by beam

  1. #21
    Lead Engineer Cake of Doom's Avatar
    Join Date
    Aug 2012
    Quote Originally Posted by jboggs View Post
    My bad! Sloppy reading. I am not used to seeing pressures expressed in pounds per square foot. Assumed psi.
    Try being used to kPa and then seeing all this stuff

  2. #22
    Associate Engineer
    Join Date
    Feb 2017
    Ha. No worries, we run into that a lot.

  3. #23
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Bold Springs, GA
    Quote Originally Posted by jp_rukus View Post
    I definitely appreciate everybody's help.

    Kelly, am I correct that 144,000 would be divided between the center beam and the two side channels that are attached to the table (also anchored to the floor) holding the cross members down?
    With sufficient FOS applied that would a safe assumption ... I doubt that the structure will deflect uniformly therefore assume that more deflection and resultant stress towards the center.

    I suppose you could estimate deflection by calculating with the load applied to the opposite surface and normal to the structure.

    Again, you need FEA.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  4. #24
    Lead Engineer
    Join Date
    Aug 2013
    Houston TX USA
    One problem withe the above cable arrangement is that it will not insure that the table will stay level. Any eccentric load (weight placed upon the table that is not exactly centered from one end of the cable connections to the other end) can cause the table to tilt unless you provide some type of braking/locking feature upon one or more of the table sheaves to lock the cable in place.

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