# 3 babbitt need help

[shad]

i have some #3 Babbitt , pure lead , and 70 30 tin lead rods how much of each would u mix in a 10 pound pot to get lyman #2 or a touch softer alloy

[mikeym1a]

http://en.wikipedia.org/wiki/Babbitt_%28metal%29,

according to the table giving the alloys, the Supertough babbit, listed just above grade 4, there is; Sn-83–85, Pb-≤ 0.35, Cu-7.5–8.5, Sb-7.5–8.5. Somewhere on the site is a formula of how to get #2 alloy from various mixed alloys. Can't remember how to do it right at this moment. I'm sure someone else will point you in that direction. mikey

[lylejb]

If the above figures are correct ( and I have no reason to doubt them) #3 is 84% tin, 8% copper, an 8% antimony.

Lyman #2 is 90% lead, 5% tin, and 5% antimony.

Using #3 babbitt as a base, by the time you diluted it down to 5% tin, you would be at 0.85 (or slightly less) antimony. That's not enough. If you diluted it to 5% antimony, you would be WAY over on tin.

What you need is a source of antimony, which you don't have in those listed.

Don't misunderstand, #3 babbitt is good stuff, as a source of tin.

rotometals sells a superhard 30% antimony alloy you might look at. With that, your #3, and lead you could make lyman#2

http://www.rotometals.com/product-p/...ny_70_lead.htm

5lbs of superhard + 2lbs of #3 babbitt + 23 lbs of pure lead = 30 lbs of an alloy very close to lyman #2

I say very close because the babbitt has some copper in it, and lyman does not. This doesn't hurt anything, and may slightly toughen the alloy....a good thing.

[shad]

thanks for the info

[shadowcaster]

If the above figures are correct ( and I have no reason to doubt them) #3 is 84% tin, 8% copper, an 8% antimony.

Lyman #2 is 90% lead, 5% tin, and 5% antimony.

Using #3 babbitt as a base, by the time you diluted it down to 5% tin, you would be at 0.85 (or slightly less) antimony. That's not enough. If you diluted it to 5% antimony, you would be WAY over on tin.

What you need is a source of antimony, which you don't have in those listed.

Don't misunderstand, #3 babbitt is good stuff, as a source of tin.

rotometals sells a superhard 30% antimony alloy you might look at. With that, your #3, and lead you could make lyman#2

http://www.rotometals.com/product-p/...ny_70_lead.htm

5lbs of superhard + 2lbs of #3 babbitt + 23 lbs of pure lead = 30 lbs of an alloy very close to lyman #2

I say very close because the babbitt has some copper in it, and lyman does not. This doesn't hurt anything, and may slightly toughen the alloy....a good thing.

I couldn't have said it better myself!

Shad