Hej Martin Jørgensen,
det skal kun bruges i norm stuetemperatur det er til nogle låger til nogle
bokse på 400 x 400 x 300 mm.
som skal kune lukke af sig selv.
tak for tilbuddet om indkik i dit materiale arkiv, men jeg tror jeg holder
mig til fjederen som virker mest pålidelig.
Mvh.
Søren M
"Martin Jørgensen" <unoder.spam@spam.jay.net> skrev i en meddelelse
news:41e93cf8$0$48634$edfadb0f@dread15.news.tele.dk...
> John Smith wrote:
>
>> Soren_M wrote:
>>
>>> Hello Group,
>>>
>>> i am looking for some elastic materials it could be rubber band but they
>>> tend to brake in the long run because degrading, i have also been
>>> looking for draw springs as an alternative.
>>>
>>> please tell me if there is some kind of "rubber" band that last werry
>>> long. (10 years or more)
>
> It's impossible to tell you that, if we don't know which stresses,
> temperature/ atmospheric conditions and so on you want the material to
> operate under.
>
> Under good conditions with 25 degrees C and low moisture in the air,
> you'll also get the problem with creep when you use polymers (the problem
> is even worse under bad conditions). I.e. they stretch over time, so if
> the geometric tolerances are important then I believe you can't use
> polymers.
>
> So why do you want the material to be elastic and "how elastic" do you
> want it? I mean which strains do you expect?
>
> I have a material database which relatively easily should be able to find
> something for you if you can wait some days, because I'm a little hooked
> up at the moment... But I assume that you also have a maximum budget that
> should be considered.
>
>>> Best regards
>>> Soren M
>>>
>> 10 years is a stretch, no pun intended, almost no polymer rubbers can
>> last for that long. If it absolutely has to be at polymer, try latex or
>> silicone.
>> Other wise I would suggest using steel springs, they last 10 years with
>> no problems.
>
> Yep, I agree. And perhaps use springs made with stainless steel, if the
> conditions require it. I know that there exists special "spring"-steel (in
> danish "fjeder-stål"), but I'm not an expert.
>
>
> Med venlig hilsen / Best regards
> Martin Jørgensen
>
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