1"x1"x1.25" Copper Labby Heatsinks

[Mrcrouse]

Hi, another lab heatsink my father will be making. It will be 1"x1"x1.25" with a 12mm hole for the module in the center and a 6-32 set screw, and 2 10-24 holes spaced .5" apart, and center on the bottom of the heatsink. (Other hole sizes can be chosen at no extra charge.




The price will likely be $25ea + shipping. (Discounts available for bulk orders)

I need at least 5 people interested in this to make it worth while. Hoping to go out and buy the copper Friday, so let me know ASAP if you'd like one. The first few to order should be able to be shipped out by Monday then assuming they have the right size copper in stock.

[Things]

Sorry but, why use set screws?? You're going to the expense of making them out of copper for best thermal conductivity, the minimal contact to the module using a set screw completely F@cks your thermal conductivity ..

You would be better off either making them a direct press solution (Or even back-screw, or somehow allowing the module to screw into the heatsink. Alternatively, you could also clamp the module in, but it's a bit less practical with such a wide heatsink.

Sorry if I come off a bit harsh, but it annoys me seeing so many people aiming for the best thermal conductivity they can get, blowing big money on copper, then doing something really simple that completely defeats the purpose.

[Photonbeam]

Thread one end for a lens and press fit the LD in the other end. No module.

[chad]

Sorry but, why use set screws?? You're going to the expense of making them out of copper for best thermal conductivity, the minimal contact to the module using a set screw completely F@cks your thermal conductivity ..

You would be better off either making them a direct press solution (Or even back-screw, or somehow allowing the module to screw into the heatsink. Alternatively, you could also clamp the module in, but it's a bit less practical with such a wide heatsink.

Sorry if I come off a bit harsh, but it annoys me seeing so many people aiming for the best thermal conductivity they can get, blowing big money on copper, then doing something really simple that completely defeats the purpose.

All true.
The aixiz module has a poor finish and OD tolerance. Thermal grease is not a large area filler. The module is brass with a zink plating. Brass has poor thermal stats to begin with then plate some zink on top of that, then grease then copper.

That adds up to a lot of thermal resistance. The big problem is at the module/copper mating junction. Draw two circles. One inside of the other. With one slightly smaller. You will see that the contact area is going to be small.

Any way just something to think about.

chad


chad

[Things]

Indeed, Brass has pretty shit thermal conductivity also, would definitely go for either direct pressing or screwing the diode into the heatsink with a retaining ring, but really, we're only dissipating a measly few watts. I've seen some heatsinks that'd be capable of cooling a 200W CPU used on these diode lasers.

[Mrcrouse]

I can have these made for diode press fit instead then. As for the set screw, I really haven't needed it on my other labby heatsinks as they're drilled to 15/32 and have a great press fit that you can force in just with your thumb.

[Laserock]

Hi Mrcrouse,
I would be interested in one of these copper heatsinks if you are going to make them press fit.Let me know I can PayPal you or whatever.

Laserock

[DTR]

The direct press will have a huge thermal advantage over the brass 12mm modules and they do have pretty bad tolerances. I have seen 11.85mm-12.05mm which is why I don't use them anymore.

If you do some end up doing some with the 12mm set screws though as some may still want them I have copper modules that have an exact OD of 11.92mm with a 0.005mm tolerance. I have them for 5.6mm and 9mm diodes.

https://sites.google.com/site/dtrlpf/home/diode-modules

[Mrcrouse]

I would ideally be reaming these to exactly 12mm, but it seems as though the aixiz modules have such crappy tolerance that they're normally not 12mm... I can drill them out smaller though.

I have some of those modules, and when drilled to 15/32 they have a beautiful hand-press fit.

[Mrcrouse]

I can get a .4700" reamer and have holes reamed out to 11.938mm. I can't justify buying a specialized reamer though unless you have interest in a good handful of them, or others do. Reamers are normally toleranced to .0005" or .0127mm. It is also possible to get an expansion reamer to get closer to the size, but with the hole being that close, I think it would be good. Perhaps even the 15/32 is okay for a better press fit.