Constant speed pushing mechanism (without motor)
Constant speed pushing mechanism (without motor)
(OP)
Hey there!
I've been browsing for quite a while and couldn't find an answer to the following problem:
A piston should move out over a distance of 25mm with a (nearly) constant speed of 10 to 20 mm/sec pushing against a linear spring (max force: 1N).
I want to realize this using a spring/damper mechanism without any motor (tension spring before).
My questions:
1. Is there any way not to use a constant force spring? (Normal spring + pneumatical damper?!)
2. Do you know any suppliers that sell components (maybe even combined spring dampers) of this size?
3. Could you think of another possibility to achieve this goal?
I should mention that the mechanism is to be used in a handheld device which means it should be as compact as possible.
Thank you very much!
Kind regards,
Stefan
I've been browsing for quite a while and couldn't find an answer to the following problem:
A piston should move out over a distance of 25mm with a (nearly) constant speed of 10 to 20 mm/sec pushing against a linear spring (max force: 1N).
I want to realize this using a spring/damper mechanism without any motor (tension spring before).
My questions:
1. Is there any way not to use a constant force spring? (Normal spring + pneumatical damper?!)
2. Do you know any suppliers that sell components (maybe even combined spring dampers) of this size?
3. Could you think of another possibility to achieve this goal?
I should mention that the mechanism is to be used in a handheld device which means it should be as compact as possible.
Thank you very much!
Kind regards,
Stefan





RE: Constant speed pushing mechanism (without motor)
What do you have against constant force springs?
RE: Constant speed pushing mechanism (without motor)
RE: Constant speed pushing mechanism (without motor)
RE: Constant speed pushing mechanism (without motor)
RE: Constant speed pushing mechanism (without motor)
Thanks for your answers.
The mecanism is to be triggered by manually disengaging the tensioned spring.
Actually I've already considered all of these options but none of them seems really good to me.
The gas springs are promising but I couldn't find any of this size, just bigger ones. You know a place to buy those?
Constant force springs usually pull. I need a pushing one (which would force me to use an additional lever). Magnetic constant force ones (that I found) are too strong and expensive. I'm tempted to use a long weak spring and give it a reasonable preload.
However I still need to find an online shop where I could buy dampers of this size. I found some for model cars but there isn't said anything about there constants...
Can you help me there?
Thanks again!
RE: Constant speed pushing mechanism (without motor)
Kyle
RE: Constant speed pushing mechanism (without motor)
RE: Constant speed pushing mechanism (without motor)
http://www.mcmaster.com/#air-springs/=jjrifb
also gas springs
http://www.mcmaster.com/#gas-springs/=jjriki