Techniques for hardness testing

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oneokie
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Techniques for hardness testing

Post by oneokie » Tue Aug 21, 2007 4:47 pm

Bought a hardness tester (Lee). Have read a lot of threads on various forums about the proper procedure and the instructions that came with the Lee tester.

My ingots are half-round, what I have learned is that the testing should be done on the surface that was next to the mould.

Have filed a flat on the round for the indentation ball, problem is that the surface of the flat is uneven, thus causing problems determining the true diameter of the indentation.

So, I am currently using a 3/8 inch pin punch to make a flat for indenting.
By doing this, am I changing the hardness of the ingot in the flat?

Would using a torch to melt an area for indentation affect the test results?
Those who fail to study history are doomed to repeat it.

crossfireoops
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Testing

Post by crossfireoops » Tue Aug 21, 2007 11:05 pm

Quite simply, ....you're screwed. :oops:

use your Lee tester for a paperwheight, ...or flog it to an un-suspecting greenhorn. :lol:

BUY one of Gussy's rigs, and you'll be in tall clover.

Best / simplest and most repeatable system for our soft alloys out there....

.....bar none.

GTC

oneokie
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Post by oneokie » Tue Aug 21, 2007 11:22 pm

Flame duly noted :D
Any suggestions-thoughts on the remainder of my post?
Those who fail to study history are doomed to repeat it.

Circuit Rider
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tester

Post by Circuit Rider » Wed Aug 22, 2007 3:04 am

Purchased A tester from Jim at Cabine Tree, it works great. Circuit Rider :D

crossfireoops
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Testing alloys

Post by crossfireoops » Wed Aug 22, 2007 6:36 am

"Any suggestions-thoughts on the remainder of my post?"
_________________


Old Bill Ferguson has beat it into my head that Lead / Tin alloys
WORK SOFTEN....so your 3/8 strike area would be softer than the rest of the ingot.

"Would using a torch to melt an area for indentation affect the test results?"

One would have to think that the freshly frozen surface would approximate the surface of a freshly cast slug, .....no?

GTC 8)

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montana_charlie
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Post by montana_charlie » Wed Aug 22, 2007 7:10 am

If you can master the mildly maddening manual microscope manipulation, the Lee tester will provide readings with an accuracy equal any other.
I 'shave' a small flat spot (on large items like ingots) by taking a single light cut with a gentle hammer blow on a very sharp chisel.

On a bullet, I just use my knife.
CM
Last edited by 1 on montana_charlie, edited 0 times in total.
Retired...twice. Now, just raisin' cows and livin' on borrowed time.

oneokie
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Post by oneokie » Thu Aug 23, 2007 11:18 am

crossfireoops, have read about the work softening of lead alloys, reason I asked. Is reasonable that the freshly frozen area would be similar to a freshly cast bullet.

montana_charlie, that is too simple a way! :oops:

This cast bullet attempt is getting complicated. So much to learn and remember. :D

montana, have the fires affected you?
Those who fail to study history are doomed to repeat it.

crossfireoops
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Cast Boolits

Post by crossfireoops » Thu Aug 23, 2007 2:52 pm

Hey, .....don't be intimidated by this casting racket, ...other than knowing that it is addictive and a rewarding pastime.

Old Bill Ferguson is my good bud, and I've been fortunate to get a bit of his tutelage over the last 6-8 years. He offers FREE metalurgical consulting, and it's good for him in a theraputic sense.

Here's a site that you should check out, and that has got some SERIOUS archives / long running threads / and though I've quit posting much anywhere's anymore, they've always demonstrated real courtesy, and welcome greenhorns and their questions.

http://castboolits.gunloads.com/

In truth, after a lifetime of shooting, and casting , I've come to realize that we are all greenhorns, and one should take any "Expert" opinions with a large grain of salt.

Best luck, and hold center.

GTC 8)

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montana_charlie
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Post by montana_charlie » Thu Aug 23, 2007 8:08 pm

oneokie wroteCOLONmontana_charlie, that is too simple a way!
There are enough complicated things already without getting in all lathered up making a flat spot on a lead ingot.
montana, have the fires affected you?
Too far away to feel the heat or see the flames, but we get some pretty heavy smoke at times.

One thing you'll find about that Lee tester...
The figures on the conversion chart don't go low enough to get all the way down to pure lead.

I can email you a one that does...
CM
Retired...twice. Now, just raisin' cows and livin' on borrowed time.

oneokie
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Post by oneokie » Thu Aug 23, 2007 9:51 pm

montana_charlie,

I would be grateful if you would email the chart for the softer alloys.
Took me about 6 indent measurements before I figured out the manipulation of the microscope. Like looking into a mirror and moving things. Would be good practice for a Dental student!
Would you have a suggestion for a site where information can be found for adjusting the alloys hardness? How much Lead or Tin to change the BHN?
Thanks to everyone for the help :D
Those who fail to study history are doomed to repeat it.

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montana_charlie
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Post by montana_charlie » Fri Aug 24, 2007 7:17 am

oneokie wroteCOLONmontana_charlie,
I would be grateful if you would email the chart for the softer alloys.
If there was an 'email' button at the bottom of your post, I would have sent the chart without being asked...but there isn't.

However, you can use mine. Then I'll know your address.
CM
Retired...twice. Now, just raisin' cows and livin' on borrowed time.

Kelley O. Roos
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Post by Kelley O. Roos » Fri Aug 24, 2007 7:54 am

oneohie,

Your making all this casting stuff harder then need be. Don't believe everything you read in these chat rooms.

Kelley O.

oneokie
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Post by oneokie » Fri Aug 24, 2007 9:23 am

Kelly, the casting is the easy part. Every thing else involved is what is complicated. :lol:
Those who fail to study history are doomed to repeat it.

Kelley O. Roos
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Post by Kelley O. Roos » Fri Aug 24, 2007 12:23 pm

OK, Give us an example of, "Everything else involved is what is complicated" inquiring minds like to know.

Kelley O.

powderburner
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Post by powderburner » Fri Aug 24, 2007 1:07 pm

that would be holding your tongue in the right position while aligning the b on the primer with the index mark on the case and ensuring that the proper number of powder kernals has been counted into the case.
...dean
Dean Becker
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