how to build a robot arm?

Answer 1

well thats a difficult thing to describe, because yahoo doesn't allow so much character to write here

Try looking at this
http://www.geocities.com/gidesay/roboticarm.html

Answer 2

The building is easy.

A robot arm is simply a multi-axis machine tool, with the axes arranged to allow 5 or 6 DOF (Degrees of Freedom) at the "working" end of the arm (as opposed to the "base" end).

As with any machine tool, there is drive and there is structure. Drivers can be any kind of "controllable" motor, like steppers or servos. Structural integrity of the joints is accomplished by bearings (we like tapered rollers in our applications).

The trick is the control part - axis transformation mathematics to accomplish control and positioning of the working end of the arm (how many degrees of input at each motor is required to achieve the desired path and rotation at the working end?).

Matrix math is used to do this; you may be able to find some "off-the-shelf" packages out there to assist you.

Answer 3

real the dance the robotic develop into depending off the former action photo robots from the way they walked so rather plenty its basically strolling in many cases like it ought to. Now-a-days if its a present day-day state-of-the-artwork robotic is in all likelihood basically dancing.

Answer 4

Here an amateur had described how he made his robot arm
http://www.makezine.com/blog/archive/2006/02/how_to_make_a_robot_arm.html