Cheap linear actuator's position sensor

Other Hardware Motors, Mechanics, Power and CNC
1

Hello,
I have two linear actuators (up to 400mm) and I want to measure their position, that way I could adjust it so they would have approximate extrusion (they do not operate at exactly same speed). I have looked at industrial grade potentiometers, but they cost a LOT. Is there some easier, cheaper way? I do not want to use laser or other sophisticated way, because actuators will work outside in poor weather conditions (thus I think only analog potentiometer devices would work).

Maybe there are reel type cable cheap potentiometers?

Thank you.

2

String pots ("reel type") are generally not cheap.
There are many low cost linear actuators with built-in potentiometer feedback. If you want to keep the one you have, maybe something like the laser distance sensor might work.

3

Do you need to compare analog positions or could simpler digital sensors do the same job?  Tell more about the application.

4

as I mentioned - I do not want to use laser because of harsh working conditions.

5

Then the best suggestion I can make is to replace the actuator with one that has built-in position feedback.

6

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