Â¡Niers! wrote: Am I right? There's no pressure in the tank?
mdmf007 wrote:Tom - i have wanted to build a scaled tank for years. cant find the bobcat tracks cheap enough to make it worth it.
Â¡Niers! wrote:mdmf007--That's exactly what I was looking for. A simplified schematic of how it all matches up.
So, here's a few thoughts. I have some very powerful electric motors that I could use to drive the pump. They had plenty of power to drive my last vehicle all over the playa. I'm sure one of them would be enough for the pump.
Your electric motor will need a power supply, most likely a gas powered engine. Through conservation of energy, going from Gas to produce electricity, to turn an electric motor to turn a hydraulic pump will suck all sorts of efficiency. Your call though
Another thing....if I remember correctly, aren't most all the hydro fittings and components made of aluminum?
You can get hydraulic fittings in steel, and aluminum. Steel is most common.
If so, I've read that some food processing plants use water as hydro fluid. Since it's liquid it won't compress. No worries of spills on the playa.
If temp is the concern with water, I could rig something up to cool it.
Just a thought. I'm sure there's some reason water isn't used or can't be used, but perhaps there's a way around it?
Water is not used for many reasons, one - it boils at 212. You can get your fluid to 212f in a hydraulic system. The pump, and motor will not have any lubrication if you use water. If you were able to travel a 1/4 mile before you seized your pump, motor or both Id be surprised. Food plants use food friendly hydraulic oil. Veggy based, but not veggy oil. Veggy oil will foam up causing other problems.
I was wrong on the price its about. 55$ a gallon from Grainger - we buy it by the barrel - i quoted our price. http://www.grainger.com/Grainger/RENEWABLE-LUBRICANTS-Hydraulic-Oil-2VXL1 Still a nice earth friendly touch in your project. You should only need 2-3 gallons for your a small system like this.
or Mobil at 186$ for a five gallon bucket. http://www.drillspot.com/products/305598/Mobil_DTE_FM_32_Food_Grade_Hydraulic_Oil?s=1
mdmf007 wrote:I was wrong on the price its about. 55$ a gallon from Grainger - we buy it by the barrel - i quoted our price.
Â¡Niers! wrote:...As far as the electric motor goes. I have solar panels and batteries that solves the gas issue. My last vehicle used 2, 24v motors that drove me and 3 others all over the playa as often as we wanted all week long, requiring only one solar charge for the week. I've been a firm believer in "Greening my Burn," so to speak.
I think just one of these motors would be more than enough to run a hydro pump, doubling my battery capacity. If not, I could use both again and have the same efficiency if not better.
mdmf007 wrote:Once again that ugly little gremlin efficiency comes into play. I hate to tell you but compressing fluid to a couple thousand pounds is energy hungry. You would be better off installing the electric motor to the axle through a reduction gear and forego any hydraulics at all.
I hate to be the bearer of bad news - but there is no way you will get any appreciable use from a solar charged, DC Battery, to electric motor, to hydraulic pump, to reduction gear powered ArtCar. You will already be losing at least a third or more of your energy just getting to the hydraulic motor that way, then you have the final drive and tires to factor in. You would need a lot of solar panels to charge the batteries needed, and this thing is not running off of a couple of car batteries mind you. You'll need lots of storage.
First post was wanting to know how to plumb up a hydraulic vehicle. Now you want to run the hydraulics with an electric motor and batteries charged by solar power. You are now creating a Rube Goldberg powered ArtCar, which is cool, but will be completely over engineered and very inefficient.
I suggest you pick one - Hydraulic, or Electric. Either one will be more efficient by itself than both together. It is not a synergistic combination by any means, and is the exact opposite - whatever that would be.
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