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I’m trying to design a simple lever system for a small mechanical gate, and I’m stuck on calculating the mechanical advantage I actually need. My prototype feels like it requires too much input force, but I’m worried if I just lengthen the effort arm I’ll compromise the gate’s stability.

I built a small gate lever once and the math seemed simple. The mechanical advantage is the effort arm length divided by the load arm length from the pivot. Lengthening the effort arm can cut the force but it makes the lever twist more and the gate feel unstable.

I tried making the effort arm longer by about fifty percent and the handle got lighter but the gate began to wobble as the lever caused larger moments on the hinge. I ended up adding a diagonal brace to keep it rigid.

Maybe the problem is not the leverage at all but friction in the hinge or misalignment. I swapped in a small roller bearing and the effort dropped a few pounds.

I did a quick test by measuring the force with a spring scale as I opened the gate and watched how the force traced a curve rather than a straight line. It shifted with angle and with how the gate sat.

I keep thinking about a two stage lever or a counterweight but I never tried it on a tiny gate yet. It might keep the moment down while keeping the hand effort reasonable.

One day I drifted away from the plan and looked at the whole frame I found the longest lever did not help the stiffness and ended up using a short lever with good support and a latch fix.

Would you share roughly how heavy the gate is and how much force you can apply at the handle at a comfortable point I can sanity check the numbers?

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