Servo selection problem
I have been working on a robotic arm for my first solo project from scratch. Everything has gone well for the most part, I will post the robotic arm when it is finished. I have run into a problem though and need some help with what to look for in a servo as far as specs. The problem is, the first vertical joint cannot handle the weight of the rest of the arm very well when it is idle. In motion, the arm swings fine, when at rest, it has a tendency to just fall over. I am assuming I need to buy different servos for use in my arm. I am currently using mostly futaba s3003's, except the swivel base which is an s3001, which is more powerful.
What kind of servo do I need to buy or ask for that will support at least two or three more servos worth of weight at rest?
Am I going about this the wrong way... Do I need to double up my servos at the lower joints? Or maybe I am going about this the completely wrong way.
Any help would be appreciated or a link to a guide to picking out servos(I tried searching the site for such a guide but no luck).