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

    Distinguished 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