torque required

Discussion in 'Physics' started by barrygold, Dec 19, 2012.

  1. barrygold

    Thread Starter New Member

    Dec 19, 2012
    Hi, I am new to this!

    I am struggling to answer the following:

    what size ( torque etc. ) 6 volt dc. planetary gear motor would I need to lift
    a 3kg. load vertically.
    I plan to couple the gear motor directly to a 12mm dia. steel acme lead screw
    with a 3mm pitch.
    The load I will attach to a brass lead screw nut.
    A stainless steel guide will stop the nut rotating and so give it vertical travel.

    Any better guesses out there than mine ?

    Thanks all.
  2. WBahn


    Mar 31, 2012
    Could you provide a rough sketch? I have two very different mental pictures of your arrangement depending on how I interpret your description.
  3. BillO

    Well-Known Member

    Nov 24, 2008
    Also, what is the gear ratio of the planetary gear motor, or do you just need the torque after the planetary gear?

    Do you need a theoretical response assuming loss-less gears and screws or do (quite likely relatively high) frictional losses have to be taken into account?
    Last edited: Dec 21, 2012
  4. shortbus

    AAC Fanatic!

    Sep 30, 2009