Recent content by roger5

mrjeffy I really would like to know. I have no measurement tools at my disposal although I can get access. I would prefer a way that does not involve combusting the fuel. gravenewworld Can you suggest such a drying agent?

Is there a simpler way, using something portable?

Hi How is it possible to tell if fuel (gas) is contaminated (by water / alcohols / oils etc)? Roger

Thanks for the detailed replies AlephZero. Thing is, for my application, I cannot buy something off the shelf, I need to "replicate" the behavior of a damper, which I will have to construct myself. What I have to do is make some kind of collision protection mechanism for colliding trolleys. So I...

Well actually I was looking at this system as a "brake" for the weight, where the "syringe" would slow it down to a standstill. So if seen in that light, what you say is good I guess. So I want to calculate the time for the weight to come to a stop.

How does the mass of the weight, and the fact that it impacts the "syringe" affect the calculation?

Say I have a device that looks like a large syringe, filled with some liquid (water). On the "plunger" side I have a flat plate say, that holds the water in the cylinder. On the "nozzle" side, the water is hold in by some cover. I eject the water by striking the flat plate with a weight of...

That's what I thought. Thanks

Can somebody explain Achimedes principle to me? Where he used it to determine the difference in density between silver and gold. Apparently he immersed a lump of gold and silver in water (I assume they were the same size/volume) and each lump displaced a different volume of water. Is that the...

It's starting to sound like what I need. Any chance you could send a sketch? I don't understand how the spring fits into the equation?

Another question: Say I have to have an external tank providing air (or some other gas). Would the system be able to work in a self-contained way, ie. without having to introduce air from outside the system (the system being the tank and cylinder)?

Ok, I get it. So here's the thing: Is there any way to have the mechanism self-contained in the cylinder? What I mean is, to do without some kind of external tank to provide the pressure source of air or whatever? What I am thinking is the cylinder is pressurized enough to raise the weight, but...

I forgot to ask: How would the pressure relief valve fit into the equation exactly?

Pneumatic I guess I meant. What I need some kind of cylinder that extends and lifts a weight. I also need to activate the lifting via some kind of RF signal. I would then manually return the weight to the original position.

Hi I have a weight of around 100lbs that I need to raise by a few inches. Basically what I would like is some kind of compressed-gas device that I can place underneath the weight and: 1. then trigger the gas to expand and raise the weight. 2. push down the weight to restore it to its...