Excuse me, I'm testing my thesis. I'm creating an automatic flood barrier of 2 folded doors (like a laptop). Mechanically I use iron plate + iron holo 2x4 with the assumption that the total weight / mass is 20kg (10kg / door). The obstacle is when folding up I always get a stall / can not stand on the top my assumption is "maybe because of excessive torque". finally I tried to cut the hinge salon that is on servo60kg, 25cm to 8cm. The torque formula is right, but Even still can't go up because the hinges of the salon is too short. is there any solution? please my head already burn🙏
Tutorial at: Pololu - Force and torque
isn’t it true that the longer your hinge arms are - you’ll get less lifting ability the further away from the hinge point ?
Shorter hinges may work in your favour ?
Right, but the problem is the distance between the lever arm and the second door is very short. I'm thinking if the weight of my door is 10 kg, is it still 10 kg overall? or will it change at each different fulcrum? because I feel with my hand if I lift at the top base of the door then it will feel heavier if I lift from the bottom of the door base
Thank you, very helpful. but the article has not answered my question
The mechanism in your CAD drawing looks nothing like the mechanisms in your two photos, and the two photos seem to depict two completely different linkage mechanisms. The calculation of torque is completely dependent on the system geometry, and geometric constraints imposed by the mechanism design. Without an accurate diagram of your actual system, no meaningful answers to your questions will be possible.
The weight of the door does not change. However, the force needed to move it is smaller the further you go from the hinge of your door/the fulcrum.
As mentioned above, we do need an accurate diagram or your actual door. And the actual weight of the door. As well as the actual torque generated by your servo.
It was not intended to. However, if you understand and apply the principles discussed in the article, you will understand the problem, and answer the question yourself.
As already mentioned in post #7 above.