Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
hydraulics
I never played with hydraulics before and I'm after some tips.
I'm thinking about making a height adjustable stool, using hydraulics. Was thinking of making a ram out of pvc pipe and using a garden sprinkler valve to release the pressure(stool goes down). I'm guessing I need some sort of hydraulic pump to raise the stool, anyone know what sort of pump would suit this application? I'm thinking about using just water and would like to find a cheap source for a pump.
Thanks guys... _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Mon Sep 13, 2010 6:45 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
Anyone know if this sort of thing would work? Thanks.
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
Not that I am an expert on hydraulics, but you would probably need a high pressure pump, rather than a high volume pump. If you go with water, a pump like that would rust and seize pretty quickly. How about picking up a discarded lift chair and seeing if you can hack the gas strut to work as a hydraulic cylinder?
Tue Sep 14, 2010 7:17 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
The ram I'm cool with I can do that myself. If I make a large bore ram the pressure needed would be low but the flow needed would be higher and I guess I could use oil. Thanks for the input. _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Tue Sep 14, 2010 7:49 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
How fancy do you want to get? What's your power source?
You could try car power steering pumps, IIRC they will work up to around 500psi and are commonly available. _________________ https://www.halfdonethings.com/
Tue Sep 14, 2010 9:37 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
Not fancy @ all, cheap. Power would be a DC motor from a SLA. _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Tue Sep 14, 2010 9:59 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
Car parts always seem to come to the rescue with these budget projects, it's great. I thinking a steering pump or a oil pump could work. I would have to use some type of oil. I guessing the oil pump would be better for a lower pressure application with greater flow as well. A lower pressure system would use cheaper fittings which I like, the bore of the ram would just need to be larger.
I'll try to get some pumps and play with them, thanks ppl. _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Wed Sep 15, 2010 7:35 am
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
Oil pumps run <80PSI 99.999% of the time and will require a fair amount of modification due to their in-motor design. Power steering pumps are sealed units, generally come with reservoirs, lines, fittings (banjo bolts) and rotary valves (from the steering rack) that can all be sources from the car you pinch them off. _________________ https://www.halfdonethings.com/
Wed Sep 15, 2010 8:14 am
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
Would this be for your flight sim project? If you are going to have a DC motor in there anyway, why not make an actuator from a car scissor jack? Alternatively, you might find a cheap hydraulic bottle jack and motorise that. Car parts to the rescue every time!
Wed Sep 15, 2010 1:30 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
Another NEW project Nick
Good tips guys thank you, I'll ditch the oil pump idea. _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Wed Sep 15, 2010 5:36 pm
DumHed Experienced Roboteer
Joined: 29 Jun 2004
Posts: 1219
Location: Sydney
Engine oil pumps usually have a fair bit of leakage, no shaft seals, etc.
They're meant to be sitting in the oil reservoir so it doesn't matter
Electric fuel pumps from EFI cars can be pretty good. They won't work with water, but would be ok with kerosene or similar for less flammability.
They'll usually do up to 100psi or so. _________________ The Engine Whisperer
- fixer of things
Wed Sep 15, 2010 6:36 pm
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