Math wizzards ready, Alloy mixing Question ?

[randyrat]

OK i have bars that are are 11-12% Antimony and lead, witha trace of tin. (Burned out linotype?)
70/30 tin/lead bars
WWs
How do i make dublicate Lyman #2 alloy.. I can come close but i'm not 100% on the math end of this. I'm not looking for exact numbers.
How about if i start with 10 lbs of WWs aprox 12 bhn
Tin/lead bars 70/30 (1lb 8 oz bars)?
11% antimony/lead bars?
And can you kinda show your math so i can dublicate this equation again someday. I know i'm asking a lot but it may help more than one person or someone thats afraid/chicken to ask. Lyman #2 is about 15 BHN. I want my batch to be between 10 lbs and 15 lbs

[ktw]

I have a simple spreadsheet I created to make those calculations. Using it I arrive at the the following


Alloy ................. Alloy lbs ...|... Pb% ... Pb lbs ..|.... Sn% ... Sn lbs .|... Ant% ... Ant lbs
------------------------------|--------------------|--------------------|-----------------------
WW (clip-on)..... 11.20 ......|.. 95.5% ... 10.7 ..|... 0.5% .. 0.056 ..|.... 4.0% .. 0.448
Pb/Ant(11%)....... 2.80 ......|.. 89.0% ..... 2.5 ..|... 0.0% .. 0.000 ..|.. 11.0% .. 0.308
70pSn/30Pb........ 1.00 ......|.. 30.0% ..... 0.3 ..|. 70.0% .. 0.700 ..|.... 0.0% .. 0.000
------------------------------|--------------------|--------------------|-----------------------
......................... 15.00 ......|.. 89.9% ... 13.5 ..|.. 5.0% .. 0.756 ..|... 5.0% .. 0.756

-ktw

[ANeat]

Download the alloy calculator http://www.castbulletassoc.org/downloads.shtml

[garandsrus]

Randyrat,

Send me an email and I will send you an Excel spreadsheet that will help with the alloy calculations.

John

[Adam10mm]

Download the alloy calculator http://www.castbulletassoc.org/downloads.shtml

For some reason I can't get the program to "calculate". :confused:

[randyrat]

Thanks that should help. I used to have bullet samples and just add a little of this and a little of that,then add a little eye of noot, toods foot untill i matched the weight and bingo i would have a match for the bullet i need. Now i can have a batch ready to go and save some time. I doubt i can break myself out of weighing until i match what i want, i still depend on my scale and hardness tester for final jugment of a bullet.

[hunter64]

I have tried that program before and it will calculate the percentages but I cant figure out how to find the bhn number of the batch . So if someone else can point it out that would be great.

If I input for the sake of consistancy, 1 lb of 50/50 Lead/Tin Solder and 9 lbs WW
I get the following
TIN=5.23%
Antimony=2.7%
Lead=92.08%

How do you figure out the BHN from this?

[Lloyd Smale]

I would guess that if you mixed 20lbs of pure with 20lbs of your lead/antimony mix and then added one lb of your 70/30 youd be awful close. to get #2 exact isnt usually a big consern of mine. I just make up what im making in a big batch and use it. If you want to fine tune it, weight a bullet that you allready have and ajust it with a tad more or less of the antimony mix.

[Leftoverdj]

Lyman #2 is 90-5-5. One of your tin/lead bars has a pound of tin in it. Add one bar to 19 pounds of WW and you'll have something very close to #2. Lloyd's mix would also get you close since 50-50 lead/burned out lino is essentially WW.

Exact math is a waste of time because we are working with inexact alloys.

[montana_charlie]

I have tried that program before and it will calculate the percentages but I cant figure out how to find the bhn number of the batch . So if someone else can point it out that would be great.

If I input for the sake of consistancy, 1 lb of 50/50 Lead/Tin Solder and 9 lbs WW
I get the following
TIN=5.23%
Antimony=2.7%
Lead=92.08%

How do you figure out the BHN from this?
I can't answer your question...it would need somebody more familiar with Excel than I.

But, I think the problem lies in the 'formula' specified for cell F8. The BHN value is (apparently) supposed to equal the value in cell G34...which is empty.

Since the file has been made available for all of us, it would have been nice if the author had removed his digital signature...so we could make the macros work without having to drop our own security level to zero.

Is anybody able to help those of us who don't really understand this software?

CM