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Pneumatic stepper motor: R-90 Bourke engine

by VincentGroenhuis Mar 3, 2018
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Hello Vincent, i am an inventor from Croatia, and i have ordered 3D printer ender 3 pro.

My project is this, electric kids excavator.

It would use hydraulics for movement.

I would need a hydraulic pump but i was thinking about installing four electric motors and connecting each to a lever that would than pump the hydraulics. That way i would need smaller motors and i could operate multiple hand directions.

I was thinking about using supercapacitor as a battery for the motors, that way my kid can play for half an hour , and then i could charge it in five minutes.

I was thinking it being stationary in the garden, but i also think of upgrading it later in a way of just installing batteries and two engines.

I was looking all over the internet for something like this for my kids but haven't found it.

If you like the idea and have a comment you could email me on robert_james@net.hr

I like your work. thanks for sharing.

Hi RobonsSon, have a look at the parametric pneumatic cylinder (https://www.thingiverse.com/thing:3123328) in combination with a pneumatic bridger rectifier (https://www.thingiverse.com/thing:3186352)!

Parametric pneumatic cylinder
Pneumatic logic gates

tthis is what i had in mind. i designed it quickly in sketchup. i was thinking on using linear gear and electric engine to pull lever up and down. it will push and pull the hidraulic cylinder. Thats about it. for the excavator i was thinking of building it real size for my kids.i have acces to electric engines from washing machines. and im crazy. and lazy. and sometimes opsessed. would i save moneay or electricity pushing the hidraulics this way? i dont need and or nor gates because the cylinders would have each his own engine. Sou for an excavator you could move in all directions at the same time using only buttons. no arduino needed :D What do you think, is the lever worth it?

Have you opened the picture?

Hi Vincent
Amazing design congrats! I have a few questions....
What pressure is it working on? And how much pressure it hold?

  • Posted with 3D Geeks Thingiverse Browser App

Thanks! It works at a pressure of approx 1 bar and higher. Max pressure depends on material strength and infill, but 5 bar should be fine. You will see yourself when you build the motor.

Hi Vincent,

very interested in your design, what type/manufacturer of 5/2 way valves did you use to control the air into the motor?