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From your numbers, I believe you need something that can support at least ~30kg-cm torque at the load, unless you make other changes. A few options: Counterweight - As @jsotla commented, a counterbalance might be added to the opposite side of the load on the lever. If the servo attachment point or lever can not support that extra weight though, then ...

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If not moving, file the rod down or machine it, and take the smooth rod approach or screw it all way in to head and seal it there.. However, if moving.. I'd say use a nylon bushing smaller than threading and screw it on to the point it will align with edge of box it goes into, if it screws on too easy, it may be a bit too loose cause the friction may ...

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This is an appropriate question over at movies SE, but even here its probably interesting. Wall-Es character is definitely an interesting one, very dynamic, anthropomorphic, and modelled quite realistic. However there is a lot of film trickery going on here. Although Wall-E and other movie robots like Terminator seem like real mechanical systems, there are ...

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Welcome to Robotics, Andrew Sol. I think I'm a little confused with your question as it appears to be about independent rotational masses connected by rotational springs, but then later you're asking about gear ratios. This is a succinct as I can think to put it, and again I may have misunderstood the question so please feel free to comment on this answer ...

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The equations of motion is simply \begin{align} J_m \ddot{\theta}_1 + K_{md}(\theta_1-\theta_2) &= \tau_e \tag{1} \\ J_d \ddot{\theta}_2 + K_{md}(\theta_2-\theta_1) &= \tau_L + \tau_s \tag{2} \end{align} Rewriting (1)&(2), we get  \begin{bmatrix} J_m & 0 \\ 0 & J_d \end{bmatrix} \begin{bmatrix} \ddot{\theta}_1 \\ \ddot{\theta}_2 ...

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Yes it is possible. You can look at the following paper Stiffness Analysis and Comparison of 3-PPR Planar Parallel Manipulators With Actuation Compliance Guanglei Wu , Shaoping Bai , Jørgen A. Kepler

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