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is Spring necessary? - Page 2

post #11 of 16
Thread Starter 
Quote:
Originally Posted by Martinm210 View Post

Not correct for your typical linear springs

Spring rate and force is a function of distance compressed for linear springs:
http://en.wikipedia.org/wiki/Hooke's_law




Spring by Wiki
http://en.wikipedia.org/wiki/Spring_(device)
"When a spring is compressed or stretched, the force it exerts is proportional to its change in length. The rate or spring constant of a spring is the change in the force it exerts, divided by the change in deflection of the spring."

Although there are also some "Almost Constant" springs out there as well that can sort of do that.

All the springs I have used in watercooling however are the more typical linear type. Good retention systems design a threading stop to compress the spring a certain distance which then relates to a specified force. 40-50lbs total is about all the socket is designed for and the spring gives you a tool to design that in. Pretty hard to control the load without a spring, but it can be done if you are careful. Most blocks are getting pretty good at that now, but there are still a few that leave it up to the user to decide which can be too much.

When I was doing CPU block testing, I selected a spring and thumbnut that just touched the hold down when the spring reached a certain length. I used this same spring/nut for all block tests so I could ensure each was installed with the same force. Some of the factory systems actually applied force beyond intel specification and after killing two motherboards in previous rounds of testing, I wasn't about to damage another from a crappy block retention design.

Thanks this makes more sense, there is no way compressing a spring let's say 10% is anywhere close to compressing 90% when it comes to force.

Now I'm worried, If only using 2 springs / Screws there is a possibility that the spring compression is different between the 2 springs and would cause uneven assembly to cpu core,
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post #12 of 16
Spring is a necessary season. The spring on the cpu mount however, is simply a way for you to ensure even pressure for mounting.
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post #13 of 16
Quote:
Originally Posted by grandpatzer View Post

Thanks this makes more sense, there is no way compressing a spring let's say 10% is anywhere close to compressing 90% when it comes to force.

Now I'm worried, If only using 2 springs / Screws there is a possibility that the spring compression is different between the 2 springs and would cause uneven assembly to cpu core,

The best way to tell even-ness is to look at the TIM spread after removing the block. As long as you have a nice thin TIM spread nicely centered over the IHS, I wouldn't worry about it. I have hard mounted in the past and know many that do, it's just not the preferred way for designing a retention system because it takes practice and feel that you can't prescribe well.
    
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post #14 of 16
Arent springs also a little necessary for keeping the screw from loosening up?
post #15 of 16
Quote:
Originally Posted by Solonowarion View Post

Arent springs also a little necessary for keeping the screw from loosening up?

Probably a good idea on the integrated pump/blocks (They do vibrate and could loosen I suppose), but not necessary for stand alone blocks, they are isolated from vibration for the most part.
    
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post #16 of 16
Quote:
Originally Posted by MobAttack View Post

Nope, see below for my quick explanation.
That is correct. These springs are rated in lb/in (oz/in, kg/mm, etc). A 5 lb/in sping takes 5 pounds of force to compress one inch, 10 pounds of force to compress 2 inches (but it is still a linear rate of compression). So if all your bolts are torqued down and not all at the same exact height and you have the springs under them, all the springs will be pushing down with the same force each.

I'd just assume use no springs and "eye ball it" or rather use my sense of touch since i have tightened a few nuts and bolts in my day.
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