Linear Actuators

[JamesTerm]

So I have a question for everyone who has used the lead screw technique. How did you do a set point operation... like if you want it to go a certain distance? Did you:

1. Use an encoder?
2. Use a potentiometer?
3. Use a limit switch?
4. String potentiometer?
4. Something else?


If you used an encoder how do you ensure it remains calibrated (e.g. limit switch). I'd like to use this lead screw technique, but I haven't found reliable way to sense distance. (I have not tested the string potentiometer either).