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How Gas Springs create Constant Force (Patreon)

Published:
2024-07-26 21:26:17
Imported:
2026-06
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Content

Not the video I expected to make, but got QUITE a lot of question in that over-center video. I think they're worth talking about. You?

I have to cover some basics in the beginning so we're all talking the same jive, hopefully it's not too boring!

Love ya! -OldTony

Files

Previews only

The Secret Life Of Gas Springs

Need a constant force? Gas springs have got you covered! But how on earth do they do what they do?! We need some common ground to understand what's going on. If you can't stand the wait, jump to 17:28. -------------- Music: Wayne Jones 'Mr. Sunny Face'

Comments

Brent Stultz

Looking forward to it! Just have to finish this whole job thing lol

Aeronaut99

Awesome video! I work a lot with hydraulics and gas accumulators but had never understood how these work. Now I've got a new way to think about them. Thank you!

Peter Argyropoulos

Ok, here's my guess. At pressure inside the cylinder equal to atmospheric, the pressure differential of the top and bottom sides of the piston based on the area of the piston rod is being acted on equally by the end of the piston rod sticking out of the cylinder. If you sealed the hole back up and placed the gas spring into a pressurized container, it would force the rod back into the cylinder. If you pressurized the cylinder to above atmospheric, it would force the end of the rod back out. It has to do with the rod transferring that little bit of area to the outside of the cylinder and the pressure differential determining how much weight it can support. Is that close? I mean, I'm just an electrician. Also, I'm pretty sure that even if it walks like a duck and quacks like a duck, it's not necessarily a machine gun.

Kyle Wellman

Since you drilled a hole in the side of the piston wall, the gas (atmospheric pressure) is no longer contained within just that cylinder wall. Even though you still technically have a surface area differential from the piston side to rod side of the cylinder that would hypothetically mean more force is pushing on the piston side than rod side, you have essentially an infinite space on the piston side for the "pressure" to vent to. Ergo, the pressure will take the path of least resistance which is the hole to infinite rather than try and push its way up the cylinder housing. Always love your videos. Im sure you dont need them, but I'm in need of making a back plate for a 5C collet chuck i just got for my lathe. I have a D1-4 style spindle. Im perfectly comfortable making the plate itself, but I'd be super interested in your take on how to machine the camlock studs :D (even though i will likely have already made them by the time you'd hopefully see this comment, make a video over something you dont even need, and then post it 😁). I know there are plenty of machinists out there with more than enough street cred that i enjoy watching their stuff. But i will say, there is something very special about how your hands talk that makes me extra attached to your videos.

Thomas Eriksen

@13:32 "a force is just a force" But you should trust the force Tony…

Mukunda Modell

Man where do you get one of those green bean style, er, "snappable" gas springs. I've tried and tried but mine won't snap in half like that.

Nebojsa Mrmak

The engineer inside me understands the principle of how these work. The smartass inside me wants to make a remark about how a constant force gas spring would effect a different force in the atmosphere of Jupiter vs the Earth. The crazy scientist in me is thinking about an unnecessarily complicated way to make an absolute pressure sensor with one of these. The kid inside me is already on e-bay, ordering one.

John menefee

Might I propose an experiment: measure the force required to extend and retract the piston and rod with the vent hole open and again after sealing the hole with only atmospheric pressure in the cylinder.