Thermal Epoxy
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From: RST Engineering on 20 Mar 2010 13:25 Nope. That would require using 110ac and I want to run relatively small 2-conductor cable with a hefty wall wart 24vac that doesn't have to meet any code. Jim >What one should do is get some rain gutter heat tape from the local >hardware store
From: WarmUnderbelly on 20 Mar 2010 13:43 On Sat, 20 Mar 2010 10:25:59 -0700, RST Engineering <jweir43(a)gmail.com> wrote: >Nope. That would require using 110ac and I want to run relatively >small 2-conductor cable with a hefty wall wart 24vac that doesn't have >to meet any code. > >Jim > > >>What one should do is get some rain gutter heat tape from the local >>hardware store Then step it up at the work site. Watts are watts. The step up would not lose much to inefficiency. Rain gutter or mobile home water pipe tape is good for this application. You only need to increase the temp to a point slightly above the freezing point for water. That's where the rain-x would come in. Also, there are DC versions of such heat tapes available for the hot tub boys.
From: WarmUnderbelly on 20 Mar 2010 13:44 Set your PC clock, dipshit.
From: BobW on 20 Mar 2010 14:15 "John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message news:1dl8q516k88j8ld0e4fm7re36rjodjc1d7(a)4ax.com... > On Fri, 19 Mar 2010 21:37:14 -0700, Archimedes' Lever > <OneBigLever(a)InfiniteSeries.Org> 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 > Not fair, John, With that idiot, it's like shooting fish in a barrel. Bob -- == All google group posts are automatically deleted due to spam ==
From: D Yuniskis on 20 Mar 2010 14:27
RST Engineering wrote: > 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. There is *nothing* in your post indicating why this is *not* a viable solution. A "nearly flat" fastener would have un-measurable impact on the dish's geometry. Likewise, it would provide little opportunity for ice to "stick" (any moreso than any other place on the surface). Even if the dish is relatively small (high curvature per unit area), that just means: - the fasteners must be located closer together (e.g., straddle the device instead of axially) - use smaller heating elements (for above) - use *longer* fasteners and accept small gaps between the dish and the heating element at its extremes (the other gaps proximate to the tanget point can be filled with a thermally conductive compound *if* you think the heat will dissipate to the atmosphere more than assisting in the melting of the surrounding ice/snow) I would have explored a CalRod operated at lowered voltage to both distribute the heat over a larger area, prolong its life *and* more readily conform to the (back) surface of the dish. But, I'm sure you already thought of that >> 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. Smaller wattage tends to mean smaller devices. Smaller devices have mounting holes (axial) closer together. Closer together more closely "fits" a curved surface. But I'm sure you already thought of that >>> 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. As did: "Dabs, that's a technical term, you'll get used to it." But I'm sure you already thought of that |