Hydraulic cylinders, miniature 4 post lift

[OTmachine]

To use hydraulic you would need proportioning valves to keep the amount of fluid delivered to each cylinder the same which would increase the cost a lot. IMHO

 

[C-Bag]

I have never used one if these, just from looking at them, I get the impression that with a heavy load raised up they would be somewhat unstable?

Regardless my table is a larger than the cart, I think I need to lift in all four corners.

seeing your cart, it doesn't look bigger than the lift table, and lighter in weight than the lift cart which has most of the weight down low like frame and hydraulics. I have used it extensively and the idea it's unstable with even 1000lbs doesn't match my experience at all. But I have no idea what you are doing.

 

[aliva]

To use hydraulic you would need proportioning valves to keep the amount of fluid delivered to each cylinder the same which would increase the cost a lot. IMHO

If you parallel the cylinders a proportioning valve wouldn't be needed. The proportioning valve controls volume, which is speed, not pressure . Pressure is what determines the lift capacity .The fluid will go to the lowest pressure cylinder first then to the next lowest till all are at equal pressure. The fluid flows to the path of least resistance.
Now what I built is overkill for your needs but I use this table for working on equipment at a comfortable height. When not working on equipment is doubles as a mobile work bench. perhaps you could adapt the design to something you could use.

Hydraulic Lift Tabe

Thought I'd share a pic or 2 of my air over hydraulic lift table. I was a long drawn out project considering I had no plans to go by. so a lot was trial and error which just added to the build time. but i'ts finished and seems to do everything I had hoped for.It's constructed from 2 x 2 x 3/16'...

www.hobby-machinist.com

 

[aliva]

To use hydraulic you would need proportioning valves to keep the amount of fluid delivered to each cylinder the same which would increase the cost a lot. IMHO

 

[slow-poke]

Thanks to everyone, the trailer jack adaptation is cleaver. I'm fabricating something now, will see how it goes.....

 

[pontiac428]

You don't want to gang hydro jacks for this project, but if you want to in the future, you would tap the oil vein on the pressure side of the jack pump, beetween the check valve and the ram. Then send it out to the slave cylinders from there, port tapped in the very same location on the slaves. With multicylinder systems that are ganged this way, they will seek level based on the load on each corner, because the hydro ports function in parallel. If one pump moves your jack 0.2 inches, a gang of four will move only 0.050 per pump.

 

[Charles scozzari]

You don't want to gang hydro jacks for this project, but if you want to in the future, you would tap the oil vein on the pressure side of the jack pump, beetween the check valve and the ram. Then send it out to the slave cylinders from there, port tapped in the very same location on the slaves. With multicylinder systems that are ganged this way, they will seek level based on the load on each corner, because the hydro ports function in parallel. If one pump moves your jack 0.2 inches, a gang of four will move only 0.050 per pump.

Hi, when I worked we would do that for twin jack parking garage elevators and some twin jack holeless elevators. Thanks.