I have certified 16-1 casting material. I would like to mix a small batch at 20-1. How much pure lead should I add to 10 lbs. of the 16-1 to make 20-1?
Thanks in advance!
JKR
I have certified 16-1 casting material. I would like to mix a small batch at 20-1. How much pure lead should I add to 10 lbs. of the 16-1 to make 20-1?
Thanks in advance!
JKR
I can't believe I even opened a thread with that title. jd
It seems that people who do almost nothing, often complain loudly when it's time to do it.
Your 10 lbs (160 oz) of 16:1 will contain 9.41 oz of tin (160/17).
Converting that tin to 20:1 mix will give you 197.6 oz total (9.41 x 21).
Deduct the original 10 lbs (197.6 - 160 oz), leaves 37.6 oz of additional lead - two and a bit pounds.
Last edited by Wilderness; 11-06-2022 at 05:31 PM.
It'll be handy if I never need it.
Insomniac, agnostic, dyslectic - awake all night wondering if there is a Dog.
Okay, so the THEAD TITLE is a little "counter intuitive" (for me), too, but I got an answer I believe in. Using the
(PbConcentration1)(AlloyWeight1) = (PbConcentration2)(AlloyWeight2), I got that 2.357 pounds of .999 Pb is needed to make 20:1 Pb:Sn alloy:
(PbC1)x(AW1)=AW2. (.5882 x 10)/.476 = AW2 = 12.357.
(PbC2)
Subtracting 10 lbs (W1) from the final weight desired (12.357) for the alloy leaves 2.357 lbs lead required to increase 10 pounds of 16:1 Pb:Sn to 20:1 alloy
2.357 pounds works out to 2 pounds 5.25 ounces. If your specs demand EXACTLY 20:1 alloy, this is the amount to make 20:1 alloy out of 10 pounds of 16:1. I 20:1 is more of a "best recommendation", I think I might add pure Pb in 12 oz. portions, cast, then try.
Last edited by Kosh75287; 11-06-2022 at 06:07 PM. Reason: Spacing in equations
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Just download the alloy calculator available on the forum and use it!
Long, Wide, Deep, and Without Hesitation!
16 - 1 equals 93.75% lead, 6.25% tin so in ten pounds you have .625 of a pound of tin in your 16-1 alloy. The amount of tin will not change when you add more tin.
20 - 1 equals 95% lead, 5% tin
You have .625 pounds of tin so you will have to add 2 1/2 pounds of lead to your 10 pounds to get the tin down to 5% (20-1).
.625 divided by 12.5 equals 0.05. Convert to % you multiple by 100 which equals 5%
Last edited by M-Tecs; 11-06-2022 at 08:18 PM.
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– Amber Veal
"The Highest form of ignorance is when you reject something you don't know anything about".
- Wayne Dyer
Kosh - I wondered about the discrepancy between calculations - mine 2 lb 5.6 oz calculated on one decimal place, to your 2 lb 5.25 oz. Found it - .357 lbs x 16 oz is 5.7 oz. Near enough.
We need to be careful about ratio definitions too - 16:1 is 16 parts lead to one of tin, not one part tin in 16 total. I presume the commercial alloy really is 16:1, not one part in 16.
Last edited by Wilderness; 11-06-2022 at 07:41 PM.
It'll be handy if I never need it.
Insomniac, agnostic, dyslectic - awake all night wondering if there is a Dog.
The train arrived in Chicago at 4:50 pm.
Noah
When I first read this post I got a pencil and piece of paper took off my shoes and socks getting ready to do some serious counting but decided to go take a nap instead , I'm glad I did ....
I would just drop 1 big muffin ingot of plumbing lead in the pot
I vote for 2.5 pounds
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thats what I got - not sure its right - remember our numbers are ratio so 16:1 is 17 parts total - 20:1 is 21 parts total
He has 10 pounds of a 16:1 alloy so divide 10/17 = .588 pounds tin ----.588 x 20 gives 11.76 pounds - (pure lead) now add in the tin? + the .588 pounds tin comes to a total of 12.348 pounds total -- so add 2.348 pounds pure lead
This stuff sounds simple but is quite tricky if we wanna get technical - much depends on what is writ and how that is interpreted
my take - tell me you are using a Ratio of 16:1 says 16 parts lead to one part tin ....total is 17 parts
tell me one part tin in 16 and I get a different message - that is saying 16 pounds in the pot of which one pound is tin - so a 15:1 ratio?
Greetings,
Using the downloadable Alloy Calculator, I get 10 pounds of 16-1 plus 2.25 pounds Pure Lead = 12.25 pounds of 20-1.
Cheers,
Dave
2nd Amendment of the U.S. Constitution. - "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
"Before you argue with someone, ask yourself, is that person even mentally mature enough to grasp the concept of different perspectives? Because if not, there’s absolutely no point."
– Amber Veal
"The Highest form of ignorance is when you reject something you don't know anything about".
- Wayne Dyer
It'll be handy if I never need it.
Insomniac, agnostic, dyslectic - awake all night wondering if there is a Dog.
It'll be handy if I never need it.
Insomniac, agnostic, dyslectic - awake all night wondering if there is a Dog.
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