Studio Spot 250 Focus

[QUOTE=Uwe74;44780]Hi!

I purchased a few Studio Sport 250. One has a problem with the focus. It does the reset allright, but if I ride the lens to the farest position, it does not come back :-(
If moved by hand, the motor feels very smooth. I tried to move the C-Clip on the Post a little down, but this did not work. Could it be the Driver-Chip?

Thanks for all advices.

UWE

How smooth is smooth? You ought to be able to feel the steps in the motor, if it spins freely the motor is bad.
Feel a good motor and the resistance, slight and a tiny bit chunky and even throughout (the steppers) Now feel that motor. If the resistance is nill then it's what I call a spinner, replace it. If it's harder in a spot then smooths out, replace it.
When you hold the motor in your hands close your eyes and let your fingers give your brain the needed information.

Motor feel is a learned thing. Don Pugh taught it to me and I've refined it to an art. If there are more than two bad magnets in a motor I can feel it. Seriously.
A local company that uses a lot of robotics calls me every few months to examine units that are not working properly to feel the servo motors to see if they need replacement or the problem is somewhere else.
Some of their motors are a thousand dollars each so they want to make sure where the problem is. Their tech's don't get it and I'm not going to tell them my secrets. They pay me $300 just to walk in the door for the first hour.

[QUOTE=Uwe74;44780]Hi!

I purchased a few Studio Sport 250. One has a problem with the focus. It does the reset allright, but if I ride the lens to the farest position, it does not come back :-(
If moved by hand, the motor feels very smooth. I tried to move the C-Clip on the Post a little down, but this did not work. Could it be the Driver-Chip?

Thanks for all advices.

UWE

How smooth is smooth? You ought to be able to feel the steps in the motor, if it spins freely the motor is bad.
Feel a good motor and the resistance, slight and a tiny bit chunky and even throughout (the steppers) Now feel that motor. If the resistance is nill then it's what I call a spinner, replace it. If it's harder in a spot then smooths out, replace it.
When you hold the motor in your hands close your eyes and let your fingers give your brain the needed information.

Motor feel is a learned thing. Don Pugh taught it to me and I've refined it to an art. If there are more than two bad magnets in a motor I can feel it. Seriously.
A local company that uses a lot of robotics calls me every few months to examine units that are not working properly to feel the servo motors to see if they need replacement or the problem is somewhere else.
Some of their motors are a thousand dollars each so they want to make sure where the problem is. Their tech's don't get it and I'm not going to tell them my secrets. They pay me $300 just to walk in the door for the first hour.