Finding torque at a servo of MeArm

[highlight=#ffffff]Hey there!

I’m a newcomer to the forum and also a beginner with robotics/mechatronics but I’ve purchased and built the MeArm deluxe kit as part of a project. The problem is I would like to calculate the torque output of a servo as it rotates but can’t seem to get nearly the result I’m looking for. I am attempting to find moments about C to then find out the reaction a B and potentially use this to find out torque servo but I feel this is horribly wrong. I’ve attached an image of the setup

Some info/assumptions made are (I don’t really know if they’re of use);

  • The two arms, OC and AB can be assumed to always be vertical
  • [size=2][font=arial, sans-serif]θ ranges from 0° to 90°[/font][/size]

The lengths of the arms are;
OA=BC=3.5cm
OC=AB=CD=8cm
DE=7cm

The masses are;
Arm OC=AB=~2grams
Arm BCD=~3g
Me=0g for now (could also be 4.5g & 9g)
Md =19.7
UDL between D and E is a total of ~15g

I’m sorry if this is the wrong place to post and for the long winded post but I would so very much appreciate any help! If there’s anymore needed info I will help where I can, thanks![/highlight]

Are you looking to calculate the maximum torque which the servo can output, or calculate the torque at any given position?
It looks like you have the masses and lengths correct, so it’s simply a matter of doing a torque balance about O and C.