|
|
 | | From: | Soren_M | | Subject: | LOOKING for elastic materials | | Date: | Sat, 15 Jan 2005 12:58:56 +0100 |
|
|
 |
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)
Best regards
Soren M
|
|
| | From: | Mark Thorson | | Subject: | Re: LOOKING for elastic materials | | Date: | Sat, 15 Jan 2005 16:32:23 GMT |
|
|
| Soren_M wrote:
> please tell me if there is some kind of "rubber" band that last
> werry long. (10 years or more)
Only if you don't use it. Rubber under tension will lose tension,
due to cold flow (also known as creep). Silicone elastomer
will be more resistant to oxidation and crosslinking, but the
mechanical properties of silicone are poor compared to rubber.
If possible, you should use a metal spring. What is the
application?
|
|
| | From: | Soren_M | | Subject: | Re: LOOKING for elastic materials | | Date: | Sat, 15 Jan 2005 19:13:37 +0100 |
|
|
|
"Mark Thorson" skrev i en meddelelse
news:41E945B9.2207F713@sonic.net...
> Soren_M wrote:
>
>> please tell me if there is some kind of "rubber" band that last
>> werry long. (10 years or more)
>
> Only if you don't use it. Rubber under tension will lose tension,
> due to cold flow (also known as creep). Silicone elastomer
> will be more resistant to oxidation and crosslinking, but the
> mechanical properties of silicone are poor compared to rubber.
>
> If possible, you should use a metal spring. What is the
> application?
>
>
>
>
>
Dear Mark,
thank you for your answer.
The spplikation is hinges in a box and there will be low tension until the
lid is opened 2 times a day and then low tension again.
so i think i go for a metal spring.
best regard
Soren M
|
|
| | From: | Mark Thorson | | Subject: | Re: LOOKING for elastic materials | | Date: | Sat, 15 Jan 2005 19:05:54 GMT |
|
|
| Soren_M wrote:
> The spplikation is hinges in a box and there will be low tension
> until the lid is opened 2 times a day and then low tension again.
>
> so i think i go for a metal spring.
A spring operating within its limits is one of the most
reliable mechanical devices. This may be hard to
believe, because almost everybody has seen a broken
spring. But it is important to include a limit stop
to prevent the spring from being overstressed.
This can usually be included at little or no cost,
for example by adding a spur to stop sliding or
rotating parts.
If your application allows it, you might consider
providing the restoring force in the form of a weight
on a small chain.
|
|
| | From: | Soren_M | | Subject: | Re: LOOKING for elastic materials | | Date: | Sat, 15 Jan 2005 20:22:36 +0100 |
|
|
| Thank you Mark,
the spring shal be used in a box door in light trassperent plastic mesuring
200 x 200 mm.
i think that i go for the spring that stay within the limits so it doesent
brake.
best regards
Søren M
"Mark Thorson" skrev i en meddelelse
news:41E969B5.6182B7E0@sonic.net...
> Soren_M wrote:
>
>> The spplikation is hinges in a box and there will be low tension
>> until the lid is opened 2 times a day and then low tension again.
>>
>> so i think i go for a metal spring.
>
> A spring operating within its limits is one of the most
> reliable mechanical devices. This may be hard to
> believe, because almost everybody has seen a broken
> spring. But it is important to include a limit stop
> to prevent the spring from being overstressed.
> This can usually be included at little or no cost,
> for example by adding a spur to stop sliding or
> rotating parts.
>
> If your application allows it, you might consider
> providing the restoring force in the form of a weight
> on a small chain.
>
>
>
>
>
|
|
| | From: | Gregory L. Hansen | | Subject: | Re: LOOKING for elastic materials | | Date: | Sat, 15 Jan 2005 21:34:56 +0000 (UTC) |
|
|
| In article ,
Soren_M wrote:
>Thank you Mark,
>
>the spring shal be used in a box door in light trassperent plastic mesuring
>200 x 200 mm.
>
>i think that i go for the spring that stay within the limits so it doesent
>brake.
>
>best regards
>Søren M
It might be easier to use a compression spring, which I've seen but I
don't know if they're commonly available. They have a hook-like thing
that goes through one end and grabs the opposite end. And another one
going the other way. So when you pull on the hooks, the spring compresses
until its coils are touching, and then it can compress no more.
>
>"Mark Thorson" skrev i en meddelelse
>news:41E969B5.6182B7E0@sonic.net...
>> Soren_M wrote:
>>
>>> The spplikation is hinges in a box and there will be low tension
>>> until the lid is opened 2 times a day and then low tension again.
>>>
>>> so i think i go for a metal spring.
>>
>> A spring operating within its limits is one of the most
>> reliable mechanical devices. This may be hard to
>> believe, because almost everybody has seen a broken
>> spring. But it is important to include a limit stop
>> to prevent the spring from being overstressed.
>> This can usually be included at little or no cost,
>> for example by adding a spur to stop sliding or
>> rotating parts.
>>
>> If your application allows it, you might consider
>> providing the restoring force in the form of a weight
>> on a small chain.
>>
>>
>>
>>
>>
>
>
--
"Coincidences, in general, are great stumbling blocks in the way of that
class of thinkers who have been educated to know nothing of the theory of
probabilities." -- Edgar Allen Poe
|
|
| | From: | Soren_M | | Subject: | Re: LOOKING for elastic materials | | Date: | Sun, 16 Jan 2005 00:26:59 +0100 |
|
|
| Hello Gregory,
i dont know that kind of springs, is there at picture i can see some time
please?
Best regards
Søren M
"Gregory L. Hansen" skrev i en meddelelse
news:csc2a0$68o$5@rainier.uits.indiana.edu...
> In article ,
> Soren_M wrote:
>>Thank you Mark,
>>
>>the spring shal be used in a box door in light trassperent plastic
>>mesuring
>>200 x 200 mm.
>>
>>i think that i go for the spring that stay within the limits so it doesent
>>brake.
>>
>>best regards
>>Søren M
>
> It might be easier to use a compression spring, which I've seen but I
> don't know if they're commonly available. They have a hook-like thing
> that goes through one end and grabs the opposite end. And another one
> going the other way. So when you pull on the hooks, the spring compresses
> until its coils are touching, and then it can compress no more.
>
>>
>>"Mark Thorson" skrev i en meddelelse
>>news:41E969B5.6182B7E0@sonic.net...
>>> Soren_M wrote:
>>>
>>>> The spplikation is hinges in a box and there will be low tension
>>>> until the lid is opened 2 times a day and then low tension again.
>>>>
>>>> so i think i go for a metal spring.
>>>
>>> A spring operating within its limits is one of the most
>>> reliable mechanical devices. This may be hard to
>>> believe, because almost everybody has seen a broken
>>> spring. But it is important to include a limit stop
>>> to prevent the spring from being overstressed.
>>> This can usually be included at little or no cost,
>>> for example by adding a spur to stop sliding or
>>> rotating parts.
>>>
>>> If your application allows it, you might consider
>>> providing the restoring force in the form of a weight
>>> on a small chain.
>>>
>>>
>>>
>>>
>>>
>>
>>
>
>
> --
> "Coincidences, in general, are great stumbling blocks in the way of that
> class of thinkers who have been educated to know nothing of the theory of
> probabilities." -- Edgar Allen Poe
|
|
| | From: | Gregory L. Hansen | | Subject: | Re: LOOKING for elastic materials | | Date: | Sat, 15 Jan 2005 23:52:44 +0000 (UTC) |
|
|
| In article ,
Soren_M wrote:
>Hello Gregory,
>
>i dont know that kind of springs, is there at picture i can see some time
>please?
>
>Best regards
>Søren M
I just have vague memories of something I'd seen before. But if you
browse the hardware store and they have it, I'm sure you'd recognize it.
If they don't have it, maybe it doesn't matter.
>
>"Gregory L. Hansen" skrev i en meddelelse
>news:csc2a0$68o$5@rainier.uits.indiana.edu...
>> In article ,
>> Soren_M wrote:
>>>Thank you Mark,
>>>
>>>the spring shal be used in a box door in light trassperent plastic
>>>mesuring
>>>200 x 200 mm.
>>>
>>>i think that i go for the spring that stay within the limits so it doesent
>>>brake.
>>>
>>>best regards
>>>Søren M
>>
>> It might be easier to use a compression spring, which I've seen but I
>> don't know if they're commonly available. They have a hook-like thing
>> that goes through one end and grabs the opposite end. And another one
>> going the other way. So when you pull on the hooks, the spring compresses
>> until its coils are touching, and then it can compress no more.
>>
>>>
>>>"Mark Thorson" skrev i en meddelelse
>>>news:41E969B5.6182B7E0@sonic.net...
>>>> Soren_M wrote:
>>>>
>>>>> The spplikation is hinges in a box and there will be low tension
>>>>> until the lid is opened 2 times a day and then low tension again.
>>>>>
>>>>> so i think i go for a metal spring.
>>>>
>>>> A spring operating within its limits is one of the most
>>>> reliable mechanical devices. This may be hard to
>>>> believe, because almost everybody has seen a broken
>>>> spring. But it is important to include a limit stop
>>>> to prevent the spring from being overstressed.
>>>> This can usually be included at little or no cost,
>>>> for example by adding a spur to stop sliding or
>>>> rotating parts.
>>>>
>>>> If your application allows it, you might consider
>>>> providing the restoring force in the form of a weight
>>>> on a small chain.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>> --
>> "Coincidences, in general, are great stumbling blocks in the way of that
>> class of thinkers who have been educated to know nothing of the theory of
>> probabilities." -- Edgar Allen Poe
>
>
--
"For every problem there is a solution which is simple, clean and wrong."
-- Henry Louis Mencken
|
|
|
