Need help for choosing dc motor for my project

Discussion in 'The Projects Forum' started by eshai, Apr 22, 2018.

  1. eshai

    Thread Starter New Member

    Apr 22, 2018
    3
    0
    im working on a project and i need help
    i need to calculate the torque needed to spin a plastic disc to push a box Weighing 40kg To a distance of 20cm without friction (or minimal)
    i have to choose a dc motor with gearbox

    disc diameter = 240mm
    disc thickness= 20cm
    box weight = 40gk
    sped from = 0-20rpm 1 sec (cyclic for pushing another box)
    friction = minimal
    Push distance = 20cm

    Hopefully I formulated the question properly
    best regards my_project.jpg
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    18,851
    5,890
    The torque will be maximum when the pin is 90° from its present position.
    Calculate the position either side of the 90° position for a total stroke of 20cm from this you can calculate the minimum to maximum effort required in kg-cm.
    An empirical way is to use a spring scale attached to the pin.
    Max.
     
  3. eshai

    Thread Starter New Member

    Apr 22, 2018
    3
    0
    thanks for the replay
    too much physic for me
    i know basic physic torque=rXF
    what about moment of inertia
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    18,851
    5,890
    3.4Kg-Cm = .34Nm?
    Max.
     
  5. eshai

    Thread Starter New Member

    Apr 22, 2018
    3
    0
    3.4 kg/cm = 0.3334261 Nm
    3.4 kg/m = 33.34261 Nm
    0.33 NM its to low?
    33 Nm its to high ?
    best regard
     
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