Robotic arm with 7 servos
thingiverse
This robotic arm, made from 4mm hardboard, features a 3-axis CNC design and is printable. The budget-friendly servos used are TopLine standard servo RS 2 J/R and TopLine mini-servo ES-05 JR. For assembly, you'll need m3 nuts, bolts, and nylock nuts for the gripper. Small screws (2x10mm or 1.5x10mm) secure servo horns to parts, while double-sided tape connects "bearings" made of low-friction PVC. The base consists of a servo with 12mm spacers and washers, while the bottom and top plates are fastened with 45mm spacers and m3 screws sunk into the wood. Servo horns connect to the servoplate using small screws, and underarms attach to servohorns and servos with 2x10mm (or 1.5x10mm) screws. The wrist connects via press fit and m3x30 nuts and bolts for added security. For extra support in lifting objects, add a 45mm spacer between servomountplates and a 15mm spacer between upperarm parts, attaching springs (or two) between them.
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