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Jim there is a formula for BHN it's alittle involed but it works. You need too have some pure lead (5 BHN) and what ever lead you want to test. Both must be poured into a homemade mould (separately of course)to make a small puck of sort, about 1" dia. X 1/2" thick. Find yourself a steel ball bearing at least .500 dia. (min.). Place the ball between the soft lead puck and the one to be tested puck. Place both in a vise and tighten the vise to leave an indent on both pucks.
Remove the pucks and with a dial calipers measure their diameters and then use this formula.

5 x(measurement of lead) divided by (measurement of test material) squared x 5 = BHN

Jim in round # this is what you should have;
.453 div by .250 = 1.81 square that # (1.81 x1.81) =3.28 x 5 = 16.4 BHN.

I hope this helps you Jim, by the way it does work for I used it before I bought a LBT tester.

(Edited by BUFFALO BOB at 2:39 pm on Dec. 29, 2001)

(Edited by BUFFALO BOB at 2:42 pm on Dec. 29, 2001)

(Edited by BUFFALO BOB at 3:10 pm on Dec. 29, 2001)
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