Robotic arm with 7 servos
by jjshortcut, published
A little video:
More about the electronics and other info at:
About the mechanics:
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I used an arduino to control the servos, but for the movie I used just a regular servo setup, the servos connected to an receiver which is controlled by the remote
I'm not sure about the kg-cm, check the datasheet, maybe it specified that, and I used the round bearing things to make a rotary movement, and glued these bearing things to the back of the servo
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The base is made of one servo with 12mm spacers with m3 screw tread in it and some washers. The bottom and top plate are connected with 45mm spacers and connected with m3 screws which are sunk in the wood. The servo horn is connected with some small screws like 2x10mm (or 1,5x10mm) to the servoplate.
The underarms are connected with 2x10mm (or 1,5x10mm) screws to the servohorns and the servo itself is connected with m3 nuts and bolts to the servomountplates. the servomountplates are stuck in the servoplate with a bit of a press fit. Also u could use some glue for extra support.
The upper arms are connected on the servo with 15mm spacers with m3 screw tread in it, as you can see in the pictures.
The wrist is also connected by a press fit and some long m3x30 nuts and bolts to secure the mini servo.
For more support to lift something you can add a 45mm m3 spacer between the 2 servomountplates and a 15mm m3 spacer between the upperarm parts. Then you could attach a spring (or two) between them.
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