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Re: [ATM] 5.3 kg Cu3Sn
Can you aluminize or multi coat a speculum mirror ?
I'm not sure where this question is going but I suddenly realized
it might not be impossible to stabilize the surface on a speculum
mirror against corrosion or whatever requires you to repollish it
periodically.
Anthony Stillman wrote:
>My arch non nemesis Richard Schwartz has given me 8 pounds of 99 percent
>pure Bolivian tin. Thank you Richard.
>
>In ingot, I've now got a little over five kilograms of speculum. I'm
>getting good at making ingots. Under fifteen minutes to alloy a fairly
>uniform 110 grams of metal.
>
>It takes about 450 grams to make a 3 inch disk 7:1. It takes eight times
>that, 3.6 kg to make a mirror twice as big. A six inch 7:1. It takes only
>1 kg of pyrex to make a 6 inch standard thickness ratio blank.
>
>There's enough raw material available now to make an additional 9 kg. At
>the current rate this will take 4 months (read eight). I've yet to decide
>how much alloy to make or how to use it. The crucible currently available
>to me will hold only enough metal to pour a 6 inch blank. The largest
>crucible which will fit in the furnace I get to use will hold 9 kg. That
>crucible cost's forty dollars new, and can wait.
>
>The plan still is to make consecutively larger blanks. A 90 mm is on deck.
>The 63 mm is currently being polished only at Friday night Chabot mirror
>making workshop sessions, which I've been missing.
>
>Again, thank you Richard for helping me turn what was suppose to be a two
>or three month experiment into an open ended nightma...ah.adventure.
>
>
>Anthony
>
>lex talionis
>the law of retaliation
>
>
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>
>
>
--
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