Alloy mixture chart..

fiver

Well-Known Member
why does everyone try to make this hard.
add it all up and divide by the total weight.

look 12/4='s 3 simple math.
it doesn't matter how many 1's, 12's, 9's,or 5's you add in it always divides by the total weight.


1+1+1+1+1+12+1 makes 18 divide it by 7 [how many lbs you got there] you end up with close nuff to 2.6 that even a lab grade BHN tester won't notice.

the weird thing is that Tin works the same as antimony.
 

fiver

Well-Known Member
the amount of antimony and tin in an alloy.

if you have 4 lbs. of ww alloy you know the antimony is around 2.5% per bar.
add up your 4 bars.... 10
if you add in a pound of linotype put in a 12... or an 11.

10 plus 12=22,,, divide that by the 5 lbs of total alloy to get 4.4% antimony.
 

Mitty38

Well-Known Member
I always go by weights and use easy to add amounts to get what I want.
^^^^Fiver taught me the above method it works well.
If I am combing alloys. I just add. Like
Fiver, kind of.

For BHN.
Mix one lb of 18BHN plus two pound Of 8BHN. Gives you 3 lb of 11.3 BHN.
18+8+8=34
34÷3=11.3 BHN
Gets you pretty close like within a BHN.

I also use algebra. To accommodate for batch size.
If I am making 90 /5/5
90 lb+ 5lb +5lb=100lb
Well too much for a 20 lb pot.
Divide all by 10
9 +.5+ .5 =10lb.
Well 20 lbs is twice that so x2.
18+1+1 = 20lb
And so forth.
 
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fiver

Well-Known Member
i don't favor the BHN method so much because it's too finicky.
3% antimony is around 12 BHN.
but it takes 6% to move all the way up to 15.
if i have a good idea of the percentage i pretty much know the BHN
 

Mitty38

Well-Known Member
i don't favor the BHN method so much because it's too finicky.
3% antimony is around 12 BHN.
but it takes 6% to move all the way up to 15.
if i have a good idea of the percentage i pretty much know the BHN
Ye.... I only use that as a guestimate when watering down an allow that is a bit too hard. It usually gets me close enough. Use that for mostly pistol work(low antimony).
Now when I was making my hard ball-lyman#2 rifle alloy, you helped me develope. It did fail me.
Had me off my mark 3bh. So had to back up a bit, break it down and use your method to get spot on.
 
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Bret4207

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