• Welcome to engineeringclicks.com
  • Lead Screw model in Creo and calculations

    Discussion in 'The main mechanical design forum' started by inamukak, Feb 21, 2014.

    1. inamukak

      inamukak Member

      Joined:
      Feb 2014
      Posts:
      6
      Likes Received:
      0
      Hi

      I'm trying to make a lead screw in Creo which would be used to move a 400lb load linearly along the ground. This would be turned manually using a lever (lever is rotated to start the mechanism). I have used a lead screw with a major diameter of 1 1/4 and determined the torque to move the load would be around 36.70 lb-in. What I'm unable to determine is the speed at which this would move the load a total distance of 3 feet, and if it would be possible to change this speed so that the lever doesn't have to be turned for quite a lot of time. Any help would be appreciated.

      Thanks in advance!
       
    2.  
    3. Dana

      Dana Well-Known Member

      Joined:
      Sep 2010
      Posts:
      341
      Likes Received:
      3
      Both the torque and the speed depend on the pitch of the leadscrew, which you haven't specified. A lower pitch (fewer threads per inch) gives more linear speed but also more torque required to drive it.
       
    4. inamukak

      inamukak Member

      Joined:
      Feb 2014
      Posts:
      6
      Likes Received:
      0
      Hi

      Thanks for the reply. I took a TPI of 4 and etermined the torque required to move the load. I was basically looking for a way to related the RPM and the linear velocity, which I have figured out now.
      Also, I'm trying to determine the fail conditions for the L-shaped support holding the lead screw and the lever, but I have no clue where to start. I've been trying to run simulations in Creo to determine this but to no avail. What stresses and strains should I take into consideration? And how will a force or torque on the lever lead to failure of the support?

      Thanks!
       

    Share This Page