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Robot Jerking Servos

I added a pan/tilt system to my robot to track objects but the servos just jerk around randomly. Help? I'm using some Tower Pro servos I had lying around.


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#1  
also, when I use a wired controller to control the pan/tilt system it's not very smooth, it just jerks around.
Canada
#2  
My tower pro servos are not smooth either. Some times they move smooth and other times they jerk around. The ones I have are from eBay and were very cheap. I got what I paid for. From what I understand they draw more amps at the beginning of their movement than they are supposed to. I could be way off base on my thoughts. Have you figured out why you are having the problem with your servos?
Synthiam
#3  
Difficult to diagnose low quality servos - but it could be related to voltage exceeding their limits. I've experienced low quality servos jump around when the voltage exceeds their specification.