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Thread: Scissors Lift Equations??

  1. #21
    Senior Engineer
    Join Date
    Sep 2014
    Posts
    35
    The ideas are very effective about the Austempered Ductile Iron as the scissor is made off iron. This is effective info. and very helpful.

  2. #22
    Quote Originally Posted by Vamfun View Post
    This looks ok but doesn't deal with lift frame weight. Here are some alternate papers that might be better.

    An excellent reference for a more detailed proof is from a paper: ”Mathematical Analysis of Scissor Lifts” by H. M. Spackman

    Attachment 957

    He also wrote a paper “Mathematical Analysis of Actuator Forces in a Scissor Lift”

    Attachment 958

    I went through these two papers. I have a few questions from "Mathematical Analysis of Actuator Forces in a Scissor Lift".

    In the Introduction, the author mentioned that the paper is to present the equations for the more general case rather than assuming that one or both of the actuator ends lie along the longitudinal axis of the scissor member. On page 9, the author took two points A and B to derive the equation for l. From Figure 3, it looks like A and B can be any point on the arms and the actuator is a linear actuator. How do I modify the equation stated in this paper to match the following case?

    If I use a DC gear motor to turn the screw thread which in turns changes the height of the platform and the motor is attached to the dial like the one shown in the photo rather than attached to the arms.

    https://en.wikipedia.org/wiki/Laboratory_scissor_jack

    Last edited by bbq_bbq; 03-02-2017 at 12:09 AM.

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