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Hi guys! 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...

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...

Thank you so much, this is exactly what I was looking for! [smile]

Dear eng-tips users, I'd like to design a mobile instrument which allows to perform a simple compression test. I need to simultaneously measure both a force (0-20N) and a distance (0-20mm), store several sets of pairs of values on an internal storage and exploit those results after via USB...