Thermal Epoxy
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From: John Larkin on 20 Mar 2010 00:57 On Fri, 19 Mar 2010 21:37:14 -0700, Archimedes' Lever <OneBigLever(a)InfiniteSeries.Org> wrote: >On Fri, 19 Mar 2010 19:51:34 -0700, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>Epoxy can fail in situations like this. > > That depends entirely on the properties of the particular epoxy being >used. Duh. Thank you for another brilliant insight. John
From: E on 20 Mar 2010 04:47 "RST Engineering" <jweir43(a)gmail.com> kirjoitti viestiss�:4v98q5996fb4n1o2s56cj0r7e2leosj251(a)4ax.com... >I need to bond a couple of 20 watt metal housing resistors to my > satellite dish to melt snow when it forms. I've found the perfect way > to do it on a relatively flat surface, but there are no attachment > fasteners. > > Is there a good, weatherproof thermal adhesive that will take a bit of > heat out in the weather 365/24/7 and transfer the heat from the metal > resistor housing to the dish ironmongery? That can be had for a > couple of ounces? Without some sort of huge minimum purchase? > > I mean, I need what, a couple of dabs? (Dabs, that's a technical > term, you'll get used to it.) > > Thanks, > > Jim There are also PTC heater foils like those from Conflux. Might be easier to attach. Mouser sells them.
From: RST Engineering on 20 Mar 2010 04:53 On Fri, 19 Mar 2010 19:36:09 -0700, D Yuniskis <not.going.to.be(a)seen.com> wrote: >Hi Jim, > >RST Engineering wrote: >> I need to bond a couple of 20 watt metal housing resistors to my >> satellite dish to melt snow when it forms. I've found the perfect way >> to do it on a relatively flat surface, but there are no attachment >> fasteners. > >I assume the dish is metallic? Do you have any idea what sort >of metal it is made from? Yessir, steel. What difference does that make? > >Is there some reason you can't *drill* a hole into the dish >for a pop rivet, or other "nearly flat" fastener (there are some >screw heads that resemble a *nail*)? RTFQ. > >Depending on size, you might want to use a greater number of >smaller (wattage) resistors to spread the heat across the >surface more uniformly (?). Means nothing to the question. > >> Is there a good, weatherproof thermal adhesive that will take a bit of >> heat out in the weather 365/24/7 and transfer the heat from the metal >> resistor housing to the dish ironmongery? That can be had for a >> couple of ounces? Without some sort of huge minimum purchase? >> >> I mean, I need what, a couple of dabs? (Dabs, that's a technical >> term, you'll get used to it.) > >Sure! A Dab is two Smidgeons (in the Northern Hemisphere, that is) Lends nothing to the discussion. Jim
From: RST Engineering on 20 Mar 2010 04:57 On Fri, 19 Mar 2010 19:51:34 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Fri, 19 Mar 2010 18:47:25 -0700, RST Engineering ><jweir43(a)gmail.com> wrote: > >>I need to bond a couple of 20 watt metal housing resistors to my >>satellite dish to melt snow when it forms. I've found the perfect way >>to do it on a relatively flat surface, but there are no attachment >>fasteners. >> >>Is there a good, weatherproof thermal adhesive that will take a bit of >>heat out in the weather 365/24/7 and transfer the heat from the metal >>resistor housing to the dish ironmongery? That can be had for a >>couple of ounces? Without some sort of huge minimum purchase? >> >>I mean, I need what, a couple of dabs? (Dabs, that's a technical >>term, you'll get used to it.) >> >>Thanks, >> >>Jim > >You don't really need low theta, because you don't care much if the >resistor body gets a few degrees warmer. Almost all the heat is going >into the mongery anyhow. So use some strong epoxy. > >Or better yet, clamp it somehow and use some silicone grease, or >almost any grease. Epoxy can fail in situations like this. Long >stainless pipe clamps are good maybe. Ya know, a stainless worm clamp around each resistor with goose grease between it and the dish arm isn't that bad of an idea. Thanks. Jim
From: TTman on 20 Mar 2010 06:23
"RST Engineering" <jweir43(a)gmail.com> wrote in message news:4v98q5996fb4n1o2s56cj0r7e2leosj251(a)4ax.com... >I need to bond a couple of 20 watt metal housing resistors to my > satellite dish to melt snow when it forms. I've found the perfect way > to do it on a relatively flat surface, but there are no attachment > fasteners. > > Is there a good, weatherproof thermal adhesive that will take a bit of > heat out in the weather 365/24/7 and transfer the heat from the metal > resistor housing to the dish ironmongery? That can be had for a > couple of ounces? Without some sort of huge minimum purchase? > > I mean, I need what, a couple of dabs? (Dabs, that's a technical > term, you'll get used to it.) > > Thanks, > > Jim Screw them to the back of the dish at the top.... Deform the dish a little so it is flat. |