My robot has a gripper with a a highly geared little 2 watt motor that turns a shaft, winding up a string, which pulls the two jaws together. There is a spring for retracting the jaws.
It all works okay, but the limiting factor on the gripping power is the string. When picking up something fairly heavy, the string will break. So I need a stronger string or cable. I am currently using a braided nylon string about
1.2mm (1/20 inch) thick. I cannot use steel cable because the winding shaft is only 1/8", and steel cable won't bend that tight (I tried).I need something flexible, but with as much tensile strength as possible. I only need about six inches. So what should I use? What about kevlar cord? Anyone know where I can get that?