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Remote contrtolled manipulator to eradicate common wild oat

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fcheslop:
The actuator always reminds me of the Kimble steam engine
Iv used those actuators on small scale automation although they were pneumatic. Iv also come across hydraulic machines that used water instead of oil for the fluid. From memory Im sure they had adjustable stops to set the amount of movement and a damping regulator to slow them down as they neared the end of there stroke
http://www.john-tom.com/ElmersEngines/20_Kimble.pdf
cheers

eskoilola:
Now. a bit of hydraulic mathematics done by a person who has never-ever done that before.
I tried to figure out what kind of pressures and fluid flows is this about.
I also found out that there are a lot of www sites that have calculators for this but they are almost all talking about inches....

Here is an illustration I draw for myself to figure that out


First I tried to calculate the displacement for one degree rotation angle with the following dimensions:
Shaft diameter: 20mm
Cylinder diameter: 100mm
Cylinder height: 100mm
After some calculation the displacement came into a VERY comfortable figure 2.09 cubic centimeters.

After that I decided that one degree would cause 10 mm movement on the end of the leg. So for every centimeter there is a displacement of 2 cubic centimeters. Just for pure luck the leg is about 50 centimeter long in this case - which is near the length I like.

Now, if there is a pressure of 1 kilogram per square centimeter then the force at the end of the leg will be 2 kilograms.

With those dimensions of the actuator I need a pressure of 25 kilograms per square centimeter to be able to lift 50 kilograms.

Now I need Your opinion on a few things here:
1. are my calculations and estimation even near what that could be in reality ?
2. is a pressure of 25 kilograms per square centimeter manageable ?

Thanks for reading !

Edit: About using water as hydraulic fluid. In Finland we must add some antifreeze to it. A bio version of that would be Vodka !

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