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Thread: Electric hydraulic press ?
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9th Feb 2021, 11:31 PM #1China
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Electric hydraulic press ?
Hi I am in the process of building a small bench mounted 20 ton press I have a 20 ton bottle type jack,
I have decided that it is really slow to operate so considering converting to electric ( not air over electric ) can the bottle jack be modified to suit, or should I replace with Ram, is there a inexpensive source for the pump and motor salvaged from something? don't want to spend a fortune. want to keep it nice and clean i.e. not seeping oil.
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10th Feb 2021, 09:13 AM #2Diamond Member
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Belt driven power steering pumps are cheap at the wreckers. More recent cars are being fitted with all in one electric power steering pumps rather than belt drives.
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10th Feb 2021, 10:17 AM #3Most Valued Member
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Lost my post trying to add more ...
A power steering pump is a vane pump and the flow would be too high for a small cylinder without appropriate valving, and they are not suited to high pressures as the vanes are thin and not designed for high pressure. In saying this l do have a power steering pump on a press but the cylinder has a much larger surface area, 90 mm, and the press has flow control. I get about 12 ton with the power steering pump and then use a foot pump that will get 40 ton.
China you will need a small gear pump, work out the surface area of the piston and the speed of travel that you want and match a pump to that.
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10th Feb 2021, 12:32 PM #4Senior Member
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A bottle jack can be converted to work in the press.
However there are a couple of problems.
Most of these jacks operate in the 6000 psi range.
A vane pump or gear pump will not work if looking for 20T. A piston pump will be required. Electric driven piston pumps can be expensive off the shelf. That's why most of these are air over hydraulic setups.
If a different ram is an option then any type of pump can be used. The ram just needs to be sized to suit the pump.
Another advantage with a dedicated ram is it can be double acting getting away from spring return setups.
Tony
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10th Feb 2021, 01:30 PM #5Most Valued Member
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The normal bottle jack style presses are definitely very slow - one of the reasons I recently built my (overkill) powered press recently.
Here are some thoughts from what I went through.
You need roughly a 4.5" ram and 3000psi to get 20T.
One of the challenges I had when building mine was that with a single stage pump you either get good volume and ram speed or a pump that is capable of higher pressure but doesn't have the flow and you're back to slow positioning. My pump has about 4l/min flow and on a 5.5" ram is bordering on too slow - but its got good control under load.
If you go with a dedicated 10,000psi ram it keeps the size smaller, and therefore the volume of oil that needs to be pumped for any given ram movement.
You can get these 20T single acting rams for a reasonable price https://www.ebay.com.au/itm/HYDRAULI.../263208175147?
Combine that with a two stage porta-power style hand pump and you'd get a lot quicker movement than your current jack, or use a setup like Shed has with a low pressure pump and then a single stage high pressure manual pump to finish off. A manual pump gives you much better "feel" than powered if you are using it to press bearings and shafts etc.
Looking forward to seeing what you end up with.
Steve
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10th Feb 2021, 01:31 PM #6Most Valued Member
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Really we need to know the cyl bore of the jack, going by tonys figure of 6000psi then a gear pump still might suit as it will drive the rod to the job and maybe give you 10 ton?
If you need more pressure you then use the hand pump.
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10th Feb 2021, 03:27 PM #7China
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Thanks for the replies, seems like I may be better to go for a ram, no point only getting half the tonnage then having to use the hand pump, sort of defeats the purpose
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10th Feb 2021, 04:12 PM #8Most Valued Member
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My Masada 20 tonne jack has around a 50mm diameter ram, so that is knocking hard on 12000 PSI, even at 63mm diameter that is over 8000 PSI.
Gear pumps are not high pressure pumps in hydraulic terms with pressures much over 3000 PSI being less common and piston type pumps taking over.
If I were making a 20 tonne press, I would look very seriously at a portapower ram with a decent air over hydraulic pump (not a chinese knock off). Next option would be an electric porta power pump (chinese knock offs from $500 upwards, name brands $$$$) and last would be a 4 1/2" cylinder and electric pump. I do quite like the electric porta power pumps as they are quite compact and provide a good working speed.
I'd have to say that 20 tonne is not massive tonnage and for the effort and cost involved a 50 tonner is probably better value overall depending on your likely usage.
There is a video floating around Youtube of a bottle jack that has been modified so that a cordless drill operates the piston pump, which is an interesting solution and quite cheap too.
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10th Feb 2021, 06:51 PM #9Diamond Member
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Search for Colin Fuze (sp?) on U tube. English mad inventer.
He might have done something like you are after.
He fitted a hydraulic pump and ram to bench press. He's very entertaining as well....
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11th Feb 2021, 02:25 PM #10Senior Member
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Colin Furze
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12th Feb 2021, 01:02 AM #11Diamond Member
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12th Feb 2021, 08:49 PM #12Most Valued Member
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15th Feb 2021, 07:57 PM #13Senior Member
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Thought I`d throw this up as an alternative.
12 volt power pack.
DSC07935.jpg
This is mounted on my 2T engine crane with custom ram. Set to 1500 psi it will lift 2T easily.
These pumps will do up to 3000 psi so to get 20 t a ram with about 110 mm bore will be needed.
The battery can be a pain keeping it charged but it`s worth the convenience of control of the crane.
Tony
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15th Feb 2021, 09:58 PM #14China
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Yep thanks again for the replies, ideas, gives me a few things to toss about, I will post the results when done. need to do some painting first ( my favorite job NO!)
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16th Feb 2021, 08:01 PM #15Golden Member
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A few years back I bought a 2 post garage hoist. It had an issues so the vendor sent me a replacement motor/pump/reservoir assembly. I was going to one day use the old one as a hydraulic somethingorother. Maybe you could see how much it would cost to buy a new or second hand pump - give Hood Auto Performance Products | Home am email and ask?
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