Hello fellow engineers,
A friend is part-way building an outside storage chest. For whatever reason, the materials and size of storage that he is going for means that the door is heavy to lift and not very practical. I've suggested that he manufacture a counterweight system to aid in opening the door.
I've made an attempt to calculate the required weight by modelling using simple moments and balancing forces, but I'm not happy with the result as I'm pretty sure I'm missing things from my model.
Since I've modeled this as a statics problem, my issue becomes how to account for the force applied by the person lifting the door, which I have assumed would be applied at the eyelet.
Assuming my equations are correct, as theta increases, T1 should decrease since M2 is obviously constant. But isn't tension constant?
I think I'm nearly there but perhaps need a push in the right direction... It's been a while since I've done something like this!