aluminum heatsink anodizing
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From: krw on 19 Dec 2008 23:39 In article <494C4717.6FAAAC1D(a)hotmail.com>, rabbitsfriendsandrelations(a)hotmail.com says... > > > krw wrote: > > > rabbitsfriendsandrelations(a)hotmail.com says... > > > John Fields wrote: > > > > Eeyore <rabbitsfriendsandrelations(a)hotmail.com> wrote: > > > > >Phil Allison wrote: > > > > >> "Adrian Tuddenham" > > > > >> > > > > > >> > A point not often appreciated is the possible heat gain when a heatsink > > > > >> > is operated in bright sunshine. A surface finish which is a poor > > > > >> > radiator/absorber of radiant heat will work better in those > > > > >> > circumstances. > > > > >> > > > > >> ** Only a complete dope would not find some way to shade the heatsink from > > > > >> direct sunlight on a hot day. > > > > > > > > > >There's no shortage of dopes. > > > > --- > > > > And you're the proof of the pudding. > > > > > > You're out of your depth. > > > > That's OK. You're out of your mind. > > How many of YOUR high power amplifiers are for sale in the shops and on ebay ? We've > made tens of thousands of them. I don't do "high power amplifiers" nor am I silly enough to use sil- pads on even high power processors (where we've made millions of them). You're out of your mind. -- Keith
From: Archimedes' Lever on 20 Dec 2008 02:36 On Fri, 19 Dec 2008 18:31:54 GMT, Rich Grise <rich(a)example.net> wrote: > Plain aluminum has very poor emissivity. It varies with surface finish differences. Grit blasted matte finish and 36 grit rough polish emit pretty well compared to average extrusion finishes.
From: Archimedes' Lever on 20 Dec 2008 02:42 On Fri, 19 Dec 2008 10:47:18 -0800, "Joel Koltner" <zapwireDASHgroups(a)yahoo.com> wrote: >"Rich Grise" <rich(a)example.net> wrote in message >news:pan.2008.12.19.18.24.23.338610(a)example.net... >> I'm so enamoured of Dow Corning 340 grease that when I buy a new CPU >> and heatsink kit, I clean off the goo that comes with the kit and >> use my own personal (lifted from the USAF) DC-340. > >You realize that DC-340 stuff causes cancer, right? > >Just kidding. :-) > Remember in 1971 or so when they banned FD&C red dye No. 3? Joined the Navy in '78 and the dental disclosing solution they gave out to the recruits at boot was a small bottle of pure FD&C Red Dye No. 3.
From: Archimedes' Lever on 20 Dec 2008 03:02 On Fri, 19 Dec 2008 16:53:55 -0800, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Thu, 18 Dec 2008 20:39:54 -0800, Capt. Cave Man ><ItIsSoEasyACaveManCanDoIt(a)upyers.org> wrote: > >>On Fri, 19 Dec 2008 03:29:21 +0000, Eeyore >><rabbitsfriendsandrelations(a)hotmail.com> wrote: >> >>> >>>Now do the sums kiddie ! Heatsinking is an expert area that clearly no-one else >>>here has much of a clue about. I've been studying it for over 30 years. >>> >>>Graham >> >> >> You're an idiot. My last large sink product was a 1500W supply for a >>CAT scanner for Philips. We used a custom extrusion > > >What's amazing is that you can tool up a die and buy a truckload of >custom extrusion for nearly the price of the aluminum, which may be a >fifth the price you'd pay for a similar stock extrusion from a >"heatsink" company. > >Ditto sheet metal. We can do a custom chassis, exactly the way we want >it, with all the pems and spacers and connector holes and vents in >place, and have it fabbed for less than buying an unfinished >"standard" chassis. > >Weird. > >John There was a time when it was the other way around. I know a company that makes rugged VME enclosures, and they have there own metal shop subsidiary. Apparently, every little change needed also generates an expensive tooling charge. They can avoid such practices if they own the company making their metal for them. I wish we owned that metal shop. Their chassis are top notch, and better than all others I have ever seen. Whenever I work with a VME enclosure,I always find myself comparing the quality of the design to the AP Labs standard memories.
From: Archimedes' Lever on 20 Dec 2008 03:14
On Sat, 20 Dec 2008 01:54:10 +0000, Eeyore <rabbitsfriendsandrelations(a)hotmail.com> wrote: snip >Which of these design(s) did I originally get the idea from ? snip You're an idiot. |