hitec servos true power ?
April 13, 2012
I've built a simple arm like the one that you see in this movie:
the arm has 2 HS-7980TH motors and one 7985MG for gripper.
all parts are printed from plastic ... so it is very light. The gripper with the motor has less than 100 grams.
I have tried lifting different objects, but it seems that I cannot reach the limits from the specifications of the motors.
7980TH is supposed to lift at least 38kg/cm ... so at a distance of 10 cm it means 3.8kg/cm and at 20 cm means 1.9 kg/cm
but I can lift only about 330 grams with it (at a distance of 20 cm from the motor [the closest to the gripper]).
if I increase the weight, the motors are not moving any more.
why is that ? I was expecting to be able to lift 1.9 kg at 20 cm.
why I can lift only 330 grams?
from where is this limitation ? motors? or the controller (ssc32- from lynxmotion) ?
I use a 6V acid lead battery (12Amps) from Panasonic.
I've measure the voltage of the battery and it is 6.8Volts