fshegg3

folks, what's up? simple questions posted, numerous views, no answers. i found this site and figured i'd have a bunch of intelligent people who would read my questions, and answer them. turns out this site is full of wannabe intellectuals. fshegg3

my project needs to weld or fuse aluminum 6066 t6 to itself. i need a bunch of these joints and cannot afford a welder. i need to join 1" round stock to .25" round stock. my thought is to drill and tap the 1" round stock and thread the .25" round stock. then, screw the .25" into the 1" and hook up a car battery for about a second; effectivly creating a "poor mans" tig welding machine. will it work? how long to leave it hooked up? am i off base? thanks

what is the best way to polish aluminum 6061 T6 alloy to achieve FLAT, PARALLEL surfaces true to .001"? the pieces i need to polish range from 6"x 6" down to 2.5" x 2.5" and are .5" thick. i also need to polish copper 110 on one side only . it has to be flat to .001" also. thank you

get yourself a copy of "modern refrigeration and air conditioning" and study the "enthalpy" charts. the advantage of R-134a over R-12 is the lack of the chlorine atom which is part of the R-12 molecule. the chlorine atom in the R-12 molecule is easily separated and being lighter than our atmospheric mix of nitrogen and oxygen migrates to the upper atmosphere where it attacks O3 (ozone). this "attack" strips an electron from the O3 and makes it an O2 (plain oxygen). what makes this chemical reaction insideous is once the chlorine atom strips one ozone atom of an electron, it moves on to the next O3 and repeats the process over and over. hence the term "ozone depleting". fortunatly, O3's are constantly being created by nature. enjoy the charts.

i'm trying to construct a highly efficient heat sink to enable heat to be tranfered 3" or so. copper is my fist choice but is cost prohibitive so i'm stuck with aluminum. i'm transfering heat from a thermoelectric module (tem) to atmosphere via natural convection. the 3" distance is a long way in thermodynamics. the engineer i've been working with suggested a pyramidal shape as the only way to go. the most economical way to make a pyramidal shape is to emulate the pyramids of the INCA'S. in effect a series of graduated plates. the copper solution is best because i could stack the plates with solder between plates and bake the entire assembly to 600f when the solder flows to end up with a solid thermal mass. copper has almost twice the K value of aluminum and this would be thermally ideal except for the cost. the "incan" pyramidal heat sink would be constructed as follows: 8 plates from 6" x 6" x .375" reducing down to 1.75" x 1.75" x .375". questions: 1) is zincation absolutly necessary if the plates are THOROUGHLY cleaned and then immediatly immersed in the chemical bath? 2) will the resultant layer of copper be sufficient to solder them together as described above? 3) since the plating process physically moves ionized copper atoms would it possibly "fuse" the aluminum plates together obviating the baking process? 4) how do i make home made chemicals (i've heard about white vinigar and hydrogen peroxide boiled works)? 5) how would i calculate the proper voltage, amperage and time? any thoughts would be a big help. thanks, steven