This still a prototype, even the servo is salvaged from my old osr2 and ported to it.
Here’s a test run:
Haven’t try it out yet, but I did try to push and pull the syringes manually. well, it feels different from using an onaho, and I don’t need to mount it or hold it, it will automatically stick on pp. And def easier to clean it than clean an onaho.
I did notice the syringes getting hot quickly prob due to friction and conpression, Can someone recommend me some pumps or adapter for servo? I can’t find any function like this so I kind DIYed it.
Here’s the principle of how it works for anyone who doesn’t know yet
Let’s say at first the presure of 1 and 2 are equal to atomsphere, so no motion yet.
Then, if the presure of 2 decreases then yellow block will be pushed to the right and decreases presure of 1, now presure of 1 is less than atomsphere, so red block will be pushed to the right.
And if presure of 2 increases the reverse happens.
So in short, we can control the red block’s position by controling the presure of 2. How to do that? With a piston(syringe)
Now replace white block with the shell,yellow block with the rubber tube, and red block with your pp
This is definitely pretty interesting. Does the pvc pipe hold up under pressure? Whenever I tested and am working on my Advanced Suction module for the SR6 I found that tube always collapsed either in a bend or under vacuum. If it’s a problem I’d recommend replacing it with fuel line. It’s designed better for positive and negative pressure, and just holds up better. If you’re interested in that topic, here’s the link. https://discuss.eroscripts.com/t/new-sr6-pro-would-you-be-interested-update/198295
the only problem with presure i went into is the tube connecting piston and acrylic tube was too soft under nagetive presure, so I changed it with a stiffer tube that was for air compressor. This thing is stiff, can’t even ziptie it
also,I’m thinking about making the diameter larger so it can hold an onaho and mount it on the osr2, so it can act as both a mount for onaho and a grip/suc axis
The larger the diameter the more air needs to be pumped out. I’d recommend 3D printing something and attaching an NPT fitting to the pipe. Or are you referring to the plastic tube?
Good idea using the pneumatic cylinder in reverse and the pully system.
I am having high resistance problem with the syringes, already broke the one arm connected to the servo. Changed into gear design fond on thingiverse now it’s skipping gear due to high resistance.
