| Jarno |
Hello all,
Found these heatsinks in the trashbin at work, it took a bit of diplomacy to get the necessary papers to get them past security.
I've got four of them, and I'm building 4 channels of Aleph 5. They are 20cm wide, 32cm high and have 55mm fins on a 15mm base. Does anybody know who could be the manufacturer of these?
I do think that these should be adequate but I would like to know the rating to be sure.
Regards,
Jarno. |
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| uli |
umpfff,
Youre lucky working at such a place. At my place nobody throws precious things away:bawling: :bawling: :bawling:
Uli
:nod: :nod: :nod: |
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| Jarno |
Hello Uli,
It's amazing how much gets thrown away, and it's also quite hard to be able to take something past security. You need to ask permission to certain people, get the necessary forms. So lots of times it's easier to just throw it away, I think this is not a good thing, but I don't want to be known as a "dumpster diver"!
Jarno. |
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| uli |
| quote: | Originally posted by Jarno
I don't want to be known as a "dumpster diver"!
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Hi jarno,
who cares when you dive such wonderful heatsinks ;)
Uli
:nod: :nod: :nod: |
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| uli |
I would cut them to pieces 16cm high and build a case 40cm deep.
They are then plenty enough for 2 Aleph 2 Monos.
Uli
:nod: :nod: :nod: |
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| joho |
Hi Jarno,
Do you have a heavy electrical watercooled saw at your work?
Even then,it's a hell of a job to saw heatsink material.
I have some experience.
B.t.w. it's an attack on the old metal budged of your work. No beer tomorrow at the end of the day.
:D
Regards,
Johan. |
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| Magura |
| quote: | Originally posted by joho
Hi Jarno,
Do you have a heavy electrical watercooled saw at your work?
Even then,it's a hell of a job to saw heatsink material.
I have some experience.
B.t.w. it's an attack on the old metal budged of your work. No beer tomorrow at the end of the day.
:D
Regards,
Johan. |
Actually a simple bandsaw will do the job in minutes. I have cut quite a number of heatsinks like that.
Magura:) |
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| kilowattski |
| Holy Heatsink Batman! Great find! It looks as if that will dissapate a good amount of heat. |
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| cowanrg |
| i agree with magura. i have a relatively small bandsaw in my shop, and it does fine with large heatsinks. |
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| mpmarino |
| quote: | | Actually a simple bandsaw will do the job in minutes. I have cut quite a number of heatsinks like that. |
--and my tablesaw does a fine job as well |
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| lgreen |
What about a hacksaw? If you are careful can you cut one with a hacksaw and then file it later to get the edges smooth? Any other way by hand?
I do DIY but am not interested in buying a saw, as you can tell. |
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| ashok |
| quote: | | --and my tablesaw does a fine job as well |
For Mpmarino,
What blade do you use ?
Thanks.
Ashok. |
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| cowanrg |
lgreen,
that would be a cut im not capable of making for sure... a hacksaw would be VERY hard to get straight, and would be immensely time consuming. i would find a local shop to do it before picking up a hacksaw. |
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| mpmarino |
I used to use a non-ferrous blade until it got too dull from cutting ferrous materials:xeye:
Now I use my low hook angle miter saw blade.. |
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| SmarmyDog |
Dumpster Diving? I’m with ya’. :up:
I do occasional work for Ultra Stereo Labs (theater equipment) and just picked up a half-dozen nice 19” rackmount enclosures they had stacked out by the dumpsters yesterday! Parts from a discontinued product line. Maybe now I’ll get some of my amplifier projects done. :cool:
-Casey Walsh |
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| jacco vermeulen |
Hands Off, Casey.
That's my container ! |
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| lgreen |
| quote: | | a hacksaw would be VERY hard to get straight, and would be immensely time consuming. i would find a local shop to do it before picking up a hacksaw. |
I don't know, I've got some similar heatsinks (not quite as thick as yours) and I'm going to try it with a hacksaw. The long way and maybe the short way too. Maybe I'm just stubborn but I think it can be done. |
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| dnsey |
A friend of mine used to work at a military establishment where a lot of experimental electronic devices were used.
As soon as a project was complete, all the associated equipment was dumped 'for security reasons' - nothing was ever 'officialy' recycled.
The stuff he brought home was amazing - on one occasion enough to build a 16 channel mixer with full eq and superb connectors, and all in a huge diecast case, this just from one lot of cannibalised equipment. |
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| jackinnj |
| quote: | Originally posted by SmarmyDog
Dumpster Diving? I’m with ya’. :up:
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some go to the dump to deposit, some go to withdraw.
i have related this years ago, but each of my 3 sons got their stereo's out of the Millburn NJ town dump -- you can't believe what people throw away -- we actually made money for a while selling tube gear and turntables on EBay.
but it gets better -- the youngest, now a senior in college -- pulled a Dell server out of a dumpster at ol' alma mater -- a beautiful thing but it was fried, somehow water damaged -- #2 son sold the processors and cases on EBay, and I have two huge switch-mode power supplies to play with.
even better still, at a local private airport there was a bunch of King, Collins and Bendix stuff in a dumpster -- apparently the service department got kicked out or something -- this stuff fetched a lot on the avionics section.
buy sheep, sell deer |
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| grataku |
Jarno,
that's a pretty standard profile I have seen it on several manifacturer's catalog.
I picked up a 1 meter of that on ebay cut it in 4 pieces milled it and made a stereo AX. That looks about the lenght you got.
I am dissipating about 280 watts and that is just about all they can do for me at as they go to to 25 above RT. Fins are pretty tightly spaced. It maybe better to make a nice chassis using them as the sides since with the bars on the side the chassis is basically done already. I was thinking to anodize mine black to improve the situation but the amp got finished and stayed as it was. |
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| Jarno |
Hello all,
Thanks for all the replies!
I don't think I will cut them into pieces, I already built the amp chassis based on another pair of heatsinks I bought at a scrap metal yard. The heatsinks I found last week are a "drop-in replacement" only with longer fins. Looks like I don't need those fans after all!
If I would need to cut them up, I think all the mentioned methods would work with a little attention to the details:
Band saw, hard to get a straight cut.
Circular saw, with these fine fins you risk bending them (at least when you only have a coarse blade like I do).
Milling, takes forever.
I guess using the band saw and them milling would be best.
Greetings,
Jarno. |
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| jacco vermeulen |
Could be that i should plan a visit to Heesen shipyard around your corner to see what's inside their dumpster !
It should be filled with alloy, i cant think of any other kind of trash they have. |
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| Jarno |
Hello Jacco,
That's a pretty serious shipyard (did some HotBotting)!
I don't care much about yachts myself, but those dumpsters could be pretty interesting, stainless steel, hardwoods, alloys, nice!
Greetings,
Jarno. |
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| jacco vermeulen |
| quote: | Originally posted by Jarno
I don't care much about yachts myself, but those dumpsters could be pretty interesting, stainless steel, hardwoods, alloys, nice! |
Hé dude, i gave you a nice tip.
Time for you to tell me where you got your stash !!!
Bij van Cranenbroek verkopen ze cirkelzaagbladen met veel tanden voor weinig ! Zit vlakbij jou in Schijndel.
Taping the fins before sawing keeps the edges smooth, spraying the fins with plastic coating works for heatsinks with small fin clearance.
Groeten. |
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| Jarno |
Hello Jacco,
I got the heatsinks at the place where I work, Philips Medical Systems. The thing is, although the "dumpsters" are quite open, security is not. But from what I hear there is a place in Eindhoven where all the surplus goods go to, some interesting things can be found there. Furthermore all the scrapmetal, electronic assemblies and cables go to a company, maybe it's possible to do some recycling over there.
The shipyard is perhaps more accessible.
Greetings,
Jarno. |
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| EWorkshop1708 |
Those are some nice, hefty heatsinks!
IMO you shouldn't cut them, but you should stick a whole bunch of large output transistors to that heatsink, and you would have a nice rugged amp. Hell, you could even fan cool it and have some really good heat dissipation :D |
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| Jarno |
Hi EWorkshop,
Yeah, I was really pleased to find those heatsinks, I was a bit worried about the necessary steps needed to get them past security, but in the end this wasn't too bad. I don't think I will repeat this very often as I don't think it does much good for my credibility (and I do rate this a higher priority than satisfying my DDS (dumpster dive syndrom)).
But I think there is still too much being thrown away everywhere, lot's of stuff waiting to be found, check your local scrapmetal yard!
Regards,
Jarno. |
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