Hello, Going back and doing some adjustments on my bot. One was the high amperage usage from my other post which had to do with my stepper motor(going to try a few suggestions from the replies I got).
The last thing I'm trying to correct is the servo 'buzz' on my bot's head up/down tilt, which also draws a bit more amps (with the buzz, about an additional 350 to 400mA).
The servo is a HiTec HS-645MG.
I've tried using a counterweight, but the threshold for the 'deadzone' (?) is soo small just lightly touching the counterweight would affect the buzz.
I decided to try a 'push and pull' setup with that one servo. Seems to be a bit better, but tilting the head up seems to create more servo buzz. May try again to add a counterweight to this setup (push/pull servo setup).
Also, the top horn attachment point for the arm had to be a bit high for the movement I wanted (If I mounted the arm closer to the servo output shaft there would be a lot less servo buzz (guessing more torque) but less up/down movement). The bottom arm I just added is much closer to the servo output shaft.
Just thought I'd throw this out there...and any suggestions, ideas would be apppreciated.
Here is a short video of the push/pull setup I did:
Nice piece of geometry and a good video. What type of servo are you using for the vertical axis movement.
The camera head assembly weight is probably always trying to "fall" under the effect of gravity and,as a result placing a permanent load on the static servo. The servo endeavours to correct this, overshoots slightly, returns to correct position, drifts down again then recommences correction cycle. All this occurs without visible camera movement, but creates the buzz and you might feel this as a slight vibration. I would suggest you place a dummy camera head, of equivalent weight, to the right of the servo to act as a counter-balance. Make the linkage geometry similar to the camera system so that forces remain balanced irrespective of camera elevation. This will then place the servo in constant balance and should eliminate any tendency to oscillate (buzz)
Thanks for the reply jackrae 
The Servo is a Hi-Tec HS-645MG high torque servo, 7.7Kg.cm or 107oz.in output torque @ 4.8V (I'm running it at 5.0V).
I still have my custom made counterweight arm (not shown the in video) and some lead weights I flattened out and cut into 1" X 1.5" X .25" rectangles from some rounded fishing weights.
May try and add that again and see if it helps.
Been reading up on the servo buzz (I guess what it's called..) and appears to be, just like you said, the servo trying to maintain a current position depending on a certain force pulling (or head weight in my case), etc...
Will try a few things, and if I'm successful, will post back.
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