azonenberg changed the topic of #homecmos to: Homebrew CMOS and MEMS foundry design | Wiki: http://homecmos.drawersteak.com/wiki/Main_Page | Repository: http://code.google.com/p/homecmos/ | Logs: http://en.qi-hardware.com/homecmos-logs/
<azonenberg> Yes, you're alive
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<azonenberg> What's the first thing that jumps out at you guys about the next 30ish seconds?
<soul-d> no clue been awake to long maybe the part ẅhere transistors are later to be fitted " as if itś a loose component ?
<azonenberg> soul-d: how about the lattice
<azonenberg> silicon is not simple cubic :p
<soul-d> oh haven done chemistry a while, you could show me a paint thing of molecules wiggeling tell something id probably assume it's true :P
<soul-d> diamond cubical structure
<azonenberg> exactly
<soul-d> so thats why you need a seed with drawing silicon ingots ?
<soul-d> like with diamonds
<soul-d> if i remmber correctly
<azonenberg> well, thats to make a monocrystal
<azonenberg> regardless of the structure
<soul-d> :)
<soul-d> wonders if you can make an diy electrical furnace for that saw some diy /company with nichrome wire for aluminum forge 2kw /20 min melt wich looked intresting
<soul-d> if one can heat the furnace to max opperating temps
<soul-d> http://www.youtube.com/watch?v=en4yhzLuD9A their extremly simple diy aluminum furnace i probably gonna use that method in near future
<azonenberg> You'd need to inert purge it
<azonenberg> but thats not super hard
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<Sync_> the issue more or less is getting it pure enough soul-d
<Sync_> I just used a surplus oilburner for my furnance, 60kW of heat output easily :D
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<soul-d> :) well thought of it before but never thought it would be feasible but i'ḿ gonna start with small aluminium furnace so i can try lost wax casting methods maybe make some usable tools /
<Sync_> well before you try lost wax casting get proficient in regular casting
<Sync_> there are a lot of hassles to be tackled
<Sync_> released some piece of cheap s235 yesterday and heat treating it actually helped machining a lot
<soul-d> inert purge you mean air has to be replaced with some inert gas ? do super tiny vacume pump ". Max. Pressure 300mmHg " instock to play with
<soul-d> true sand casting was actualy on first list probably even simpler like getting the hang of it with making ingots for casting later
<Sync_> no not really, but getting the technique down how to make molds and such is not easy
<Sync_> well making ingots is supereasy
<Sync_> there is nothing to go wrong
<Sync_> mostly the problem with casting is predicting the shrinkage and controlling the heat
<soul-d> ah yeah another few tools needed like proper temp gun /measurement method
<soul-d> last time i burned trough the simple metal cruicble afhter the second melt
<soul-d> also was using coal furnace
<soul-d> so that was a mess
<soul-d> so need proper cruicble for that or get the proper clay materials to make them since prefab are never the size/form i want or arrive broken
<soul-d> will have the whole winter to think about it currently shed /outside to wet anyhow to play with molten metal for a while
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<Sync_> well the molds are made from sand soul-d
<Sync_> mixed with oil
<Sync_> and for Al you just weld up a crucible out of steel or stainless
<soul-d> yeah green sand stuff but saw them use water /moisture content there
<soul-d> long way to go thats for sure but ill start simple trying to make own clay crucibles to and then go more complex
<soul-d> steel is tricky though read you need to heat treat those first as aluminum eats trough metal or somthing thought i was fine with stainless but was way to thin i guess burned trough it second time
<soul-d> but was to me expected with 1mm or less ;)
<soul-d> was indeed the plan to visit scrapdealer for some proper materials but welding is another trick i still need to learn
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<Sync_> no steel is fine for Al usually
<Sync_> a stainless cooking pot will oxidize through
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