Servo jitters

JizzardKing · 07-02-2009, 09:47 AM

So my 7955s have the jitters. My project is not RC but an aiming device, so the jitters, while very small for servo standard, get magnified a lot in this system.

I have read and it seems the potentiometer is the cause. The pot gets between two values and the servo jumps between two positions.

I was thinking about a gearbox for stability, added accuracy, and the raw vertical support (the load on my system is vertical).

If I do decide on a gearbox, and this is where I am somewhat confused, is that I don't want to go overkill on the x:1 ratio. The 7955 has 450 steps per 90 degrees, so, if I went with a 5:1 would that increase my resolution to 2250 steps/90 degrees? Or would the resolution still be 450/90, but now my rotation is slowed by a 5th?

Or maybe there a solution other than a gearbox?

Billy T. · 07-06-2009, 07:22 AM

The gearbox will be slowing down the servo a 5th. The resolution will remain the same. Have you tried increasing the deadband to see if anything changes.