Acho que isto serva para o que queres.
(https://lusorobotica.com/proxy.php?request=http%3A%2F%2Frobosavvy.com%2Fstore%2Fimages%2Frobotis%2FRX_64.jpg&hash=e733516548b2a71512ecbc0c5d71918173b6d65f)
Dynamixel Robotis RX-64 Servo
Position and Speed resolution: 1024 steps
Resolution: 0.3°
Operating Angle Range: 300°
Max Current: 1200mA
Physical Bus Link: 4-Wire, Multi-drop, RS485 @ 1mbps
Feedback : Position, velocity, torque, temperature, voltage
Weight: 116g
Gear Reduction: 1/200
Holding Torque: 53kg-cm @ 15V , 64kg-cm @ 18V
Speed: 0.198Sec/60° @ 15V, 0.162Sec/60° @ 18V
Download Manualhttp://robosavvy.com/RoboSavvyPages/Support/
Visit Robotis site for the latest servo info.
£202.98
http://robosavvy.com/store/product_info.php/cPath/26/products_id/209
(se estiveres interessado, posso tentar um preço melhor junto da robosavvy)