how to make a robotic arm

Making a robotic arm can be a complex and challenging project, but it can also be a rewarding and educational experience. Here are the steps to build a basic robotic arm:

Design and plan: Start by sketching your ideas and creating a detailed plan for the robotic arm, including its size, number of joints, and movement range.

Gather materials: You will need materials such as aluminum or steel tubing, servo motors, control board, power supply, and wires to build the robotic arm.

Assemble the structure: Cut the aluminum or steel tubing to the required lengths and assemble the basic structure of the arm using connectors and joints.

Mount the servo motors: Attach the servo motors to the joints of the robotic arm. Make sure the servo horns are aligned and securely fastened.

Connect the electronics: Mount the control board, power supply, and wiring for the servo motors. Connect the servo motors to the control board and make sure the wiring is neat and tidy.

Program the control board: Program the control board to control the movement of the servo motors. You can use a variety of programming languages, such as C or Python, depending on the control board you are using.

Test and refine: Test the robotic arm to make sure it works as expected. Make any necessary adjustments or refinements to improve its performance.

This is a general outline of how to build a basic robotic arm<a href="https://laptopwise.com/how-to-charge-a-laptop-in-a-car/">.</a>
The complexity and difficulty of the project will depend on the design, materials, and electronics used. It's recommended to start with a simple design and gradually increase the complexity as you become more comfortable with the process.

My friend first thing you need to do is familiarize yourself with terminology used in Robotics for that I read a book "Introduction to Robotics: Analysis, Control, Applications" by "Saeed B. Niku" (it is amazing).
then decide what kind of robot you actually want to build.(i.e speherical, cyclinderical, cartesian)
steps:
1-model the arm with denavit-hartenberg technique.(inverse kinematics)
2-then do dynamic computations(velocity/acceleration for each joint)
3-trajectory planning(matlab would be really useful)
4-then comes actuation system(harmonic gearbox are popular nowadays)
5-figure out controls
6-microcontroller programming
7-doing stress analysis with software over a dimensionally accurate model
remember designing is an iterative process so as more you go through these process better will be the design

now if you want to design a prosthetic arm then it is a different story, I myself am working on it and its quite a painfully wonderful experience, if you were to go old school and design each joint it would take a lot of time, but a smarter thing would be to do research and modify already available designs

for starters go through these

+ https://youtu.be/5kb7U1qzBvc
by Z. Xu and E. Todorov - 2016 IEEE International Conference on Robotics and Automation (ICRA)
-Shadow hand is quite impressive as well
+ https://www.youtube.com/watch?v=n_7N_fpTs0g
by Yong-Jae Kim IRIM Lab, KOREATECH

if you want further more guidance relating these designs there are two channels I would recommend:
https://www.youtube.com/@therobotstudio
https://www.youtube.com/@WillCogley

but if something interesting is what you are looking for:
https://www.youtube.com/@CloneRobotics/videos (this is really impressive)

I am modeling my own anthropomorphic hand and these are somethings I have learned over time.
hope it was helpful
any suggestion would be appreciated.

what kind of arm are we talking about here, please specify