3D Printed Hydraulics 

You need a pivot for your cylinder, you're currently binding it with side load

They make mini hydraulic stuff for remote control excavators. It's neat that you built your own, but I thought this was already a solved problem.

Wow that is amazing dude I’m also still learning this stuff I’d love to learn more about your designs Really appreciate your work

Micro hydraulics seem like an idea with high potential, but i always got the feeling you had to "know a guy." I am really surprised that robotics haven't used more of it with how easy ratios are with piston vs pump size. This seems way more accessible imo, thanks.

Are you planning on taking it further? Im really excited for it! Would be awesome to actually get a hold of rc hydraulics without giving an arm and a leg!

Mini hydraulics parts for convertible cars are actually pretty cheap, also mini pneumatic cylinders work for hydraulics. Pretty cool though especially for a part that isn't something you can get off the shelf.

This is so cool! i had no idea you can print crystal clear parts like that tank. thanks!

Cool project! The 3D models make the parts seem so much bigger than they are in reality, at least to me lol. I really like your modeling philosophy of building the flow paths first and then subtracting them from the solid manifold. Well done!

I have find that oil pumps from motorcycle engine works great as a hydraulics pump.

Nothing, but *nothing* is incomoressible. End of!

In addition to tolerances that floating side plates address, those standard herringbone gear shapes will allow a leakage path that effectively joins suction to pressure. If you study commercially available helical gear pumps, you will observe that much like on a screw compressor the geometries are designed with care to minimise the leakage path at the meshing point.

Nice! What was epoxy did you use to seal things together? The brass tube into that one block. ty!

Good idea, I think you would have more success with a piston style pump driven by a stepper motor, think leadscrew on a resin printer, it would be capable of generating serious amounts of force.

instead of a gear pump, you shall definitely take an ABS unit from a scrap yard, open it and try using the design features inside of it in order to create a small but powerful hydraulic pump. If you go that path, you should investigate a lot on reducing the pressure peaks as the flow of piston pumps is not linear unfortunately. All in all, I think piston/plunger hydraulic pumps are more fit to be printed using FDM and some postprocessing (epoxy sealing of the printed components)

what about a FDM surine like pump? so having one of that big suringes actuated by a motor an a theated rod with a nut, that will generete positive/negative pressure fluid to actuate the sistem.

I would have thought a radial piston pump would work best for 3D prints as the o-ring gives a lot of leeway. I would probably cheat and use a metal cylinder 😂. It does add a lot more valves, though.

Hello ! I have no knowledge about hydrolics or robotics. But when I see the system I don't understand the advantages of going for hydrolics instead of electric actuator. As the power source is an electric motor, I think that the hydrolics are just a inefficient gearbox. What am I missing ?

Control valves *should* have bypass when in "off" position. Extended periods of "off" while the pump is running will cause the working fluid to overheat.

I would maybe try using mineral oil as hydraulic fluid.

Fascinating project. Great learning experience on number of levels. The ability to reduce parts, particularly joints is amazing.

Try regular spur gears, rather than herring bone gears, most proper hydraulic systems use regular gears, and I think there would be allot less chance of the fluid ‘slipping’ Bach through the pump. There’s really no reason to be using herring bone gears as there’s minimal thrust loads

Awesome build.

Incredible show of what can be done. You've inspired me for sure.

Great video . I used to machine and maintain hydraulic pumps professionally, this looks like a professionally made system . On another note fdm can manage parts like this , however there will be fitment and size limitation .( Gotta be large enough so that part tolarances are within the available tokerance of the printer ) i gotta get my hands on an resen printer.

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Amazing

What type of shaft seal did you use going from your gear pump to the motor? All the little ones i can find on mcmaster dont seem to hold much pressure

Great project! At some time I was going to try something like this too. Similarly, my idea would be to 3d print the channels and blocks but size the prints so they could be contained in stock profile metal sections. Doing this might help increase the working psi as the pressures could be transmitted from the fluid, through the print to the outer metal casing. Also, research might be needed into which hydraulic fluids can be used which won't erode the 3d print materials. Simple veg/sunflower oil might be all that is needed. My idea was to incorporate 3d printed channels for a hydraulic spool for controls and a hydraulic 360` rotating turntable junction such as used on an excavator but contained in stock metal sections.

with tesla turbine as pump, you can also 3d print the pump, even simpler better than the two gears you use as the pump now, well two interleaved tesla turbine discs stacks act like the gear pump, direct replacement

likely losing some pressure in long plastic hoses

what do you think about using magnetic gearbox to transmit motion to the 3d printed pump through the housing? (one set of magnets on the gear or abit distanced through shaft disk, and other set outside of housing, each next magnet changing polarity for adequate repell forces)

Ackshually