Custorm Heatsink

[Hurt_Me_Not]

Ok i'm making myself a heat sink because....
I'd like to http://www.sysopt.com/forum/smile.gif


What'd i'd like to know is Aluminun or Copper? And what sort of dimensions?
I was thinking of 200mm long x 100mm wide x 80mm high.

Also with fans has anyone tried stepping them?i.e. One fan which moves a large volume feeding a smaller fan. The effect being greater air pressure and better heat conduction?

And one more with the fin design an open fin setup(like the standard ones) or a closed one? ie the heat sink has a top and a bottom and the fans blow air through the intire length of the fins. Sorta like the Alpha ones.


Any idea's etc appricated.

[This message has been edited by Hurt_Me_Not (edited 06-27-99).]

[This message has been edited by Hurt_Me_Not (edited 06-27-99).]

[KillerBug]

Sounds like a complete waist of time, to that end, you might as well just get an alpha. Coppeer is good, but very expensive. Don't think you can melt down pennies either, they are only part copper.

[spdsk8r]

If you want to make a heatsink that would actually help in overclocking, buy a normal heatsink and turn it into a water cooler. If you really want to make it a good cooler, attach peltiers on the bottom.

Just making a new heatsink out of copper wouldn't help much. The retail heatsinks are already pretty good.

[Hurt_Me_Not]

I've got accsess to the material's and tools to do the job.Should only take about an hour to knock one up and i'd prefer to make one than buy it.

Let you know how I go.

[SoopaStar]

I think its a pretty cool idea. Why buy the best when you can maybe make better? I have heard that the more fins the better, plus i fyou can make them thinner they dissapate heat faster. My idea for a heat sink to remove heat was (in a similar fashion to water coolers) make a pipe or a vent type thing (uumm...flex-tube?) that takes the heat off the pricesser into the vent with a few 4" fans. Instead of it just blowing the hot air off into the case for the exuast fan in the power supply to suck up.
Interested to see what you get.

[8 Barrel]

Hey Hurt go for it!!I did same thing.Copied aftermarket design basically. I made my fins deeper also stacked fans with 3/8" spacers between them. I used 6061 aluminum. Sucks up heat and dissipates it very well.Heatsink doesn't even get warm to touch on o.c.'d 300a.

[KillerBug]

cool, here is an idea: make tons of realy thin fins, encase the whole thing in a slightly thick layer of copper, with holes on both ends the size of some copper tubing, then you just hook up the tubing, calk it up, and you can run it to a water cooling system, check out www.overclockers.com for more info on this.

[BBA]

I'm just kinda opposed to water coolers and peltiers becouse if either one fail they can completley destroy the PC and or motherboard/accessories.

Copper is the best conductor of heat you can get and I like the idea of making a "Finned Tube" heatsink ported to outside the case. Anyway's, even a stock Intel small fan heatsink is enough for a 558Mhz cpu if you put a really good fan on it! Thats what I'm running and it stays cool to the touch.

BBA

[SoopaStar]

I think water cooled is a neat idea...but I agree. There are too many problems. You have to worry about condensation for one. Just putting the tubing in there won't help. Petliers are neat..but if the do fail...then you have a wall between your CPU and heatsink.

[KillerBug]

So do you make heatsinks for people by chance?

[8 Barrel]

Here's a good one! My buddy used to make heatsinks for super-fast label machines. They used take a block of copper and bore a bunch of holes with a Endmill. So it looks like a screen, looking thru it.Then the capped it off and put small airhose fittings on it.One at each end.Then they ran compressed air thru it. Just a small compressor.Super cooling with out the leaking water. Alot of work.You have too be really bored to get to these extremes. LOL
ps. just food for thought

[Nathan G.]

i bet that would be nice and LOUD...Cant run sytem after 10pm due to local noise laws... ssssssssshhhhhhhhhhhhhh http://www.sysopt.com/forum/wink.gif

[This message has been edited by Nathan G. (edited 07-03-99).]

[gER0NIMo]

when you make yer fins, make em pin fins like on the alpha. this is the best kind of heatsink imo.

[v33bs]

hey, copper isn't that expensive. figure one cubic inch for $3.50 us www.onlinemetals.com (http://www.onlinemetals.com)

by the way check my site for some copper heatsink pix

[Szech]

Hurt... Follow your dreams.

Anyway, copper is a better heat conductor, but I noticed the size you are thinking of making it. 200mm X 100mm X 80mm is quite bulky, and considering the density of copper, you could have some issues with contact if the weight of the heatsink lifts it off the processor (BTW, is this for a socket processor?). Also, make sure you take processor mounting into account before you start milling this, because the heatsink will be worthless to you if you can't get it to stay on the CPU. Ducting the air flow is nice, companies have had good results with that.

Anyway, I wanted to make my own heatsink a while back too. What stopped me is that I wasn't sure I would get the mounting bracket right, and I didn't want to crack any processor cores.

[joepaloy]

Pure metals have higher thermal conductivity than alloys. Most commercial heat sinks are made from aluminum *alloys* that are ok heat conductors but have good machineablity (reduces cost).

So, if you're going to make your own I would recommend using a pure metal and put time into craftsmanship. For pure metals I would recommend the following:

Aluminum designation 1100
Copper designation OFC (oxygen free copper)

A really 'cool' alloy is called NARloy-Z, this is the alloy that NASA uses to conduct heat from rocket nozzles and vaporize liquid oxygen. It is unusual in that the thermal conductivity of this alloy is very close to pure copper. The heat flux is *high* in the NASA applications. In NARloy-Z silver and zirconium act to increase thermal conductivity. And it has high strength. You can probably get some at an industrial metals supply house.

Pure aluminum has a higher thermal conductivity than OFC so it may be your better choice.

Threads will be a big problem since pure aluminum and pure copper are hard to thread and gall easily. But, if you use helicoil inserts this won't be a problem.

The next thing would be to design a regenerative liquid cooled heat sink that does not need a fan. But don't use water, try something like a low melting point metal. There are non-toxic metal alloys that melt around room temperature. Cerro makes them, I think they contain bismuth and indium. Not cheap, but since your spending money on the project anyway why not try something really different? Well, maybe it's too risky to try all this stuff.

[Barney]

This all very interesting to talk about, but I don't think Hurt_Me_Not will ever read your replies. This thread is 1 1/2 year old...

Ronald

[jl123]

LOL! http://sysopt.earthweb.com/forum/smile.gif

I didn't even notice that!

http://sysopt.earthweb.com/forum/smile.gif http://sysopt.earthweb.com/forum/smile.gif http://sysopt.earthweb.com/forum/smile.gif http://sysopt.earthweb.com/forum/smile.gif http://sysopt.earthweb.com/forum/smile.gif

~Joel