Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers



Laser Pointer Store

Solder Heatsink

Dvorhagen

New member
Joined
Feb 17, 2010
Messages
82
Likes
9
Points
0
My upcoming build is going to be a high power LPC, in what I'm hoping to be a from-scratch, heatsinked metal host. I'm trying to do everything myself, and I don't have access to a drill press. I'm wondering about the feasibility of molding a heatsink around an AIXIZ module using solder or possibly straight lead. Lead's specific heat isn't much higher than aluminum, so I'd think its heat transference properties would be almost as good...Any thoughts?
 

Morgan

New member
Joined
Feb 5, 2009
Messages
2,178
Likes
127
Points
0
Sounds perfectly feasible. The aim is just to remove heat and lead or solder will do that. I just don't think it will be very pretty. There is a page on Wiki that looks at thermal conductivity and lead doesn't appear to be anywhere near as conductive as Aluminium, but it is Wiki I suppose! Thermal conductivity - Wikipedia, the free encyclopedia

The most important thing to do is get as good a contact between the two surfaces as you can. Thermal compound, (there are plenty of them out there), is something to bare in mind as this effectively fills the gap between two materials and creates a much better path for the heat. You don't need a lot of the compound but it will help tremendously! ("tremendously", what a word!)

Good luck... and photos please when it's done.

M
:)
 

Benm

Well-known member
Joined
Aug 16, 2007
Messages
8,011
Likes
670
Points
113
The thermal conductivity of lead is not nearly that of copper or aluminium. I suppose you could cast heatsinks out of solder, lead or tin, giving you the desired shape, but at poor conductivity. Also, mechanical strength isnt very good, which can be a downside once its fitted, but makes it easier to work on the material - you can easily drill holes in lead, or sand off large portions to get the final shape.
 

photonaholic

Well-known member
Joined
Oct 24, 2009
Messages
2,769
Likes
106
Points
63
Get a dremel tool and never look back. ;)

You can grind cut & drill aluminum with ease using one.

The best hobby money you will ever spend.
 

Benm

Well-known member
Joined
Aug 16, 2007
Messages
8,011
Likes
670
Points
113
Well, grinding down some aluminium stock bars to th desired shape using a dremel sounds like a daunting task to me ;)

On the other hand, it would perhaps be possible to cast aluminium for heatsinks, giving the finish with a dremel or similar handheld tool. I suppose its not really worth the effort though, considering the prices of prefab units.
 

Tim71

New member
Joined
Feb 12, 2010
Messages
35
Likes
1
Points
0
I was planning on taking a trip to the local Home Depot and browse the copper fittings section for something I could fashion into a heatsink for an Aixiz module. Has anyone else done the same with good results?

Thanks,

Tim
 

3zuli

New member
Joined
May 30, 2009
Messages
811
Likes
32
Points
0
it's possible, someone here (Flaminpyro afaik) already made a host using solder heatsink
try to serach 'solder heatsink'

/edit: ok, so it wasn't FP :na:
 
Last edited:

Flaminpyro

New member
Joined
May 4, 2009
Messages
5,462
Likes
551
Points
0
I rember someone soldering copper pipe pieces together with a Aixiz module and filling in the gaps with the solder, I suppos this would work ok but I wouldn't want to trust a 12x diode to it as lead is way down on the thermal conductivity poll. lead is better than air however ;)



it's possible, someone here (Flaminpyro afaik) already made a host using solder heatsink
try to serach 'solder heatsink'
 

phoenix77

New member
Joined
Apr 1, 2008
Messages
3,929
Likes
184
Points
0
Perhaps you could use SILVER SOLDER instead of the standard solder alloy. rob
 

Benm

Well-known member
Joined
Aug 16, 2007
Messages
8,011
Likes
670
Points
113
Silver solder usually only has 3% silver or so, at least the kind that you can use with a normal soldering iron. The main use is for soldering silver(plated) parts, because it prevents silver from dissolving in the solder mixture. For the same reason, a few percent of copper is sometimes added to lead/tin solders.

There is something like silver solder for jewelry work, but that is hard solder, requiring very high temperatures to work with.
 

Benm

Well-known member
Joined
Aug 16, 2007
Messages
8,011
Likes
670
Points
113
And not a bad one at that - if you want to cast heatsinks its fine, but not easier than casting them out of aluminium. Some people actually make alu castings as a hobby, but they often use sand molds, so the results are very rough.

Things like aluminium enclosures are often cast as well - but i suppose its not feasible for heatsink production on a small scale.
 

Tim71

New member
Joined
Feb 12, 2010
Messages
35
Likes
1
Points
0
Sorry to get off topic a bit here, but...

@Flaminpyro

Just saw some of your handiwork...those are some really nice copper heatsinks! How much for a basic one to fit an Aixiz 12mm?

Thanks,

Tim
 

Dvorhagen

New member
Joined
Feb 17, 2010
Messages
82
Likes
9
Points
0
Somebody tonight was just telling me about a DIY "coffee-can foundry" which will let you melt and cast aluminum. I might look into that..
 

Benm

Well-known member
Joined
Aug 16, 2007
Messages
8,011
Likes
670
Points
113
I've seen videos of it, doesnt look that hard, but the problem is still getting the mold to cast a heatsink. Aluminium isn't that hard to melt - just under 700C will do it. You can easily achieve such temperatures with ordinary wood/coal fires... just look at the pictures of cars left in forest fires, where the alloy wheels often end up as puddles of metal.
 




Top