Hello,
I want to know which of the following methods would be best, to make tiny pistons (8mm diameter of the cylinder, max. 6mm diameter of the piston) move. Of course the piston should have a recoil spring. It is important that the system has a quick response time, about 5 Hz should be no problem.
Indirect methods:
1. Using pneumatics and pushing solenoids.
2. Using a pressure reservoir and magnetic valves.
Direct method:
3. using a self made pushing solenoid in that size, with a neodymium magnetic core.
Concerning
1. A pushing solenoid is attached to a big cylinder with piston (isolated with a rolling membrane (diaphragm) or a bellow), and that is connected with a thin air hose to the tiny
piston, again using rolling membranes or a bellow.
As the Solenoid is activated, the volume of the system is decreased, therefore the pressure increased, making the tiny piston push with a certain force. I need a force a 6 N.
I calculated that then the pressure should be about 22 Psi, and , given that the Solenoid has a stroke length of 1 centimeter and that the air hose has a inner diameter of 4mm and a length of 2 meters, we need a force of about 300 Newton for the Solenoid, to create that pressure.
There is no Solenoid that could do that, in fact the best thing that I know creates 20 Newtons for that stroke length.
Can you do something about it, or is that method already checked off?
2. A pressure reservoir of big volume, holding air at about 22 psi is connected to a 3/2-way valve, which is connected with the tiny piston. Turing of the valve connects the piston with the reservoir, turning it of connects it with atmosphere.
Does that work? How to get those valves, working at these pressure levels? The should not be too expensive, because I need 40 of them.
3. I dont know how to wind the cupper wire with that tiny size restriction, to get 6 N out of it.
I will be grateful for any suggestion. Thank you in advance.