Should We Just Make Our Own Heat-Sinks Too? 2 Videos That Make Me Say YES!

FranJan

Well-Known Member

• Jul 30, 2015

• #1

Normally I wouldn't start a thread for something like this but I did want peeps to see these vids. Guy makes it look easier than all that math some of y'all do . Seriously though there's a lot of potential to save bank on DIY costs. Just need a cheap mold that has a nice flat bottom since I would think a little polishing will be involved and a weight acceptable to cool whatever COB one wants to cool.

Foundry:
https://www.youtube.com/embed/hHD10DjxM1g?feature=player_detailpage

AL Blanks:
https://www.youtube.com/embed/lSoWxG30rb0?feature=player_detailpage

See how he made a sword? You could make reflectors that way. Put those thieves at Ledil out of business ! LOL

 

FranJan

Well-Known Member

• Jul 30, 2015

• #2

Foundry:

 

FranJan

Well-Known Member

• Jul 30, 2015

• #3

Blanks:

 

stardustsailor

Well-Known Member

• Jul 30, 2015

• #4

Unfortunately Fran ,casted aluminium is more like a "sponge " ..
It is full of bubbles. (trapped atmospheric air ,Hydrogen and other gases ),thus having poor thermal exchange properties .
Casting melted aluminium ,is not the way to make heatsinks ...
Nevertheless ,those vids are pretty interesting ...

https://books.google.gr/books?id=Wbwv3nt1gp0C&pg=PA644&lpg=PA644&dq=molten aluminum and atmospheric gas&source=bl&ots=HuP7D8azyO&sig=2AjgR3eDDFP888ZKyZJOoTd-HFM&hl=en&sa=X&ved=0CCsQ6AEwAmoVChMI4q-t4reDxwIVQaksCh2dSw5E#v=onepage&q=molten aluminum and atmospheric gas&f=false


http://www.substech.com/dokuwiki/doku.php?id=degassing_treatment_of_molten_aluminum_alloys

http://www.alspecialtygases.com/Ind_molten_aluminum.aspx

Cheers.

 

FranJan

Well-Known Member

• Jul 30, 2015

• #5

Hi SDS, hope you and yours are doing well. How's the Greek Pea business ?

Anyway to refine that technique for our purposes? Something tells me no because I have a feeling it would take too long and be too costly ultimately.

Or maybe for little LEDs ?

 

Chronikool

Well-Known Member

• Jul 30, 2015

• #6

I prefer pie dishes.....FUN FACT: They also double as reflectorz..... (GASP!)

 

medicinehuman

Well-Known Member

• Jul 30, 2015

• #7

Chronikool said:

I prefer pie dishes.....FUN FACT: They also double as reflectorz..... (GASP!)

Click to expand...

Make sure that you bake a pie first to get maximum usage out of your pie pan.

 

Rahz

Well-Known Member

• Jul 31, 2015

• #8

LEDs on the brain... couple months ago I found there was a thing called casting an ant hill. I thought to myself, I bet those would make great heat sinks.

 

EfficientWatt

Well-Known Member

• Jul 31, 2015

• #9

Interesting.

Heatsinks are also of an aluminium alloy, I'm sure that comes into play for solidity, and probably thermal conductivity too.

How about making homemade reflectors ? You could try buying just 1 angelina and replicate