View Full Version : Drafting Pencil Test
B R Shooter
01-06-2021, 03:50 PM
I've been searching, and there are a lot of references of using drafting pencils to check hardness. Getting the pencils aren't a problem, but is there a "standard" procedure to use them on bullets? Using a similar method would hopefully result in readings that match some of the charts I've seen.
Conditor22
01-06-2021, 04:19 PM
This is how I've always done it http://castboolits.gunloads.com/showthread.php?378866-Lead-hardness-pencil-testing-trick
JoeJames
01-06-2021, 04:23 PM
Good reminder to me again. Thanks.
cwtebay
01-06-2021, 04:55 PM
This is how I've always done it http://castboolits.gunloads.com/showthread.php?378866-Lead-hardness-pencil-testing-trickWell that's just cool!!! Thank you for sharing, man I have soo much to learn!!!
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whisler
01-06-2021, 08:43 PM
The pencil hardness test is a standard paint film hardness test and is described under ASTM D3363 test procedure. (ASTM = American Society for Testing and Materials)
Wayne Smith
01-07-2021, 08:49 AM
And the scratch test is the standard Mohs hardness scale test of minerals.
RedHawk357Mag
01-07-2021, 11:00 AM
I think it's actually artist pencils. Stadler Mars maybe, blue and silver box. Excellent video on you tube on a procedure that is definitely repeatable in results. Actually a lot easier than the Lee microscope thing for me.
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jdowney
01-07-2021, 11:19 AM
I always thought HB was #2 - right up until I saw that table and remembered "F" pencils! I haven't seen an F for sale in years - probably whoever orders pencils for the minimal drafting section of the art store doesn't know where F fits in the scale. I'd always assumed HB was the middle.... and I remember learning in a HS drafting class that #2's were the same as the middle hardness.
That method is so cool - like finding something valuable that's been in plain sight for years :D
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