I need a air operated cylinder for my engine hoist ?

[MrJimi]

Harbor Freight Tools - Quality Tools at the Lowest Prices

Harbor Freight Tools - Quality Tools at the Lowest Prices

Harbor Freight Tools - Quality Tools at the Lowest Prices

Harbor Freight Tools - Quality Tools at the Lowest Prices

I gotta do everything for ya'll 4 different air/hydraulic jacks/rams.

LOL, you have some doubles but you know just what I'm looking for, the top two.
I will order one in the morning
Thanks
Jim

 

[Wayne County Hose]

Ya know, I went to that site and couldn't not find nuttin.

 

[texasjohn]

Skyco...you beat me to it... that's where I was going to go as I read thru the posts...

 

[cityfarma]

I have a few recycled air cylinders that I am playing with and would like to make a point.

For your use, the air cylinders may not be suitable as the hydraulic cylinder will stop when you stop pumping fluid but the air will not stay in position except at end of travel. This means it is very difficult to position things with air as you can do with hydraulics.

I am playing with using air to operate a clamp to grab saplings and pull with 3ph. I have managed to salvage some from junked equipment at work. I will use a 12 volt compressor into a small tank and electric solenoids to open and close the cylinder. They are approx 60mm diameter with approx 150mm travel. With air pressure of 30+ psi, I should get enough to grip the trunk if the clamp is designed right. When finished, I will post photos.

Cityfarma

 

[MrJimi]

Ya know, I went to that site and couldn't not find nuttin.

This may be the one that I need ? I just have to see if I have a flat base or one with a hole beneath it like this one

Thanks Skyco
Jim

 

[Farmerford]

Mr. Jimi:

I tried something similar once with fairly small loads and it did not work very well. I learned (the hard way) that you can't control the movement of the cylinder very well because air (even at 175 psi) is quite compressible. Therefore, when you apply air to the cylinder, it takes more pressure to overcome the initial friction of the joints and the piston/rod seals than it does to keep them moving once they are in motion. So when you try to lift you keep adding air until the cylinder starts extending. But when you shut off the air the cylinder keeps moving (a little or a lot, depending on load, friction, how fast you were adding air, etc.). It is difficult to move the load a little at the time it. It is particularly annoying when lowering the load, since you keep letting out air until it starts down. Then you discover that the load keeps falling when you close the valve because of both the static vs moving friction and because of the downward momentum of the load. If it is falling fast enough when you close the air, the load can actually travel down quite a bit, stop when the air is compressed enough further to hold the load, and then bounce back up a bit. I gave up after bending a few things I did not intend to.

 

[Farmerford]

Mr. Jimi:

I missed your last e-mail when I posted my reply. The air over hydraulic solves all the problems Cityfarma and I talked about.

 

[MrJimi]

harborfreight is a good company to deal with that sells a ?? product but they do stand behind what they sell.
Thanks for advice FarmerFord
Jim

 

[Reg]

REG, I don't and won't pull engines either but I have an engine hoist that I would love to convert to air, to lift stuff up in my second floor in my garage without pumping the hydraulic jack over 100 times to get something upstairs.
I ain't 20 anymore
Jim

Right,
I think that air over hydraulic thing is essentially an air motor spinnning a crank that has a piston "stroking" the hydraulic pump.
There is a manual lever at the side, just like a regular hydraulic jack, so somewhere there is some sort of free wheel mechanism.
According to what skills and tools you have it MIGHT be possible to pick the bits off the side of one of these and tack them on the side of a regular engine hoist jack.
As I said, "it MIGHT be possible to".
Given how manufacturers use as many of the same parts as possible in as many places as possible, etc.

 

[gemini5362]

I have one of the 20 ton air over hydraulic units similar to what they show in the picture. I really like it. It does exactly what he seems to be looking for. Instead of moving the jack handle up and down a bunch of times you just hit the air valve and it starts moving the cylinder up at a pace very similar to you using the handle.