How do i control the pneumatic cylinder to stop at a certain position like 25 or 50 percent? Can i use linear potentiometer with 5/2 way solenoid valve (Controlled by an external mosfet)? Or is it a must to use a 5/3 way valve?
[https://www.youtube.com/watch?v=WkrSjUp4ecM]
this is how it looks when it extends and retracts fully at 100 percent , but there are some times that i want it to stop at a position halfway
Accurately positioning an air cylinder without stops is extremely challenging, especially if the load varies. In such cases, you may want to consider hydraulics, which offer better precision and control.
If you only need to position the cylinder at a single stop, you could use a limit switch or another suitable sensor. For more advanced applications, proportional or servo valves can be used to control the airflow to the cylinder. These valves allow fine adjustments to the position by modulating the pressure on either side of the piston.
Here’s a link to a source for linear sensors that might be helpful for your setup:https://www.automationdirect.com/adc/overview/catalog/sensors_-z-_encoders/linear_position_sensors
i'm using pneumatic..if i use linear potentiometer instead of the other sensor? together with my 5/2 valve
You can only make a pneumatic or hydraulic cylinder stop immediately at any point by balancing the input pressure with the output side pressure. That will take a very complicated valving system. Is it really worth the trouble? That is why designs use electrically operated screw driven devices. They stop immediately when the power is removed.
Actually it is electropneumatic so the valve is controlled by solenoid
Show us a drawing of the plumbing you are using to control the piston position.
Show us a picture of the hardware used, too.
chuawy,
My thoughts about stopping an air cylinder halfway out or in is problematic, too many variables to control, air pressure and air regulation, plus mechanical load. I would suggest that you use staged cylinders. this means two or more cylinders ganged together so that pressurizing the first cylinder stops half way out and pressurizing the second cylinder is full stroke. two cylinders a little bit more money. But reliable operation can be achieved.
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