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Thread: Guys, what is a Rockwell Tester...

  1. #1
    Member EeeBees's Avatar
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    Guys, what is a Rockwell Tester...

    have been watching a guy's knifemaking videoes on Youtube and he has a vid on the Rockwell Tester...I cannot understand what it is for...???!!!
    ...amitie, respect mutuel et amour...

    ...le beau et le bon, cela rime avec Breton!...

  2. #2
    Member Tommy's Avatar
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    Hardness testing device, google Rockwell hardness

    Basically a standardised pointy thing jabs the test piece with a set force behind it and you judge how hard it is by the hole made
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  3. #3
    Member john worthington's Avatar
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    what he said fundamentally important if you want to do your own heat treating. has a diamond point you pre load it into the steel apply a major load and the difference shows on a gauge.you need to know how hard the steel is from the quench to know how long and how hot to temper it
    crikey that was long winded
    cheers john
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  4. #4
    Member EeeBees's Avatar
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    Thank you both for your replies...

    So the importance of the test is knowing how hard the steel will be when the knife is finished, yes?!!! Are all knives treated like that or it is only serious handmade ones...? I am guessing that you could pick up anomalies in the steel, as well?
    ...amitie, respect mutuel et amour...

    ...le beau et le bon, cela rime avec Breton!...

  5. #5
    Member Tommy's Avatar
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    Bear in mind that a material can have a surface that's extremely hard, with a softer core (bearing races being a good example)

    What are you measuring ?

  6. #6
    Member john worthington's Avatar
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    all knives should be treated like this but big companies do huge amounts at a time so only test a sample .the test should be done at all stages. out of the quench you want your steel as hard as it can get ie 65rockwell .you could then immerse in liquid nitrogen for hours and test when out 66rockwell .into tempering furnace for 2hours at 250 degrees c test when out 60rockwell .which is the best working hardness trade off between edge holding and toughness for our example steel .this recipe is different for all high carbon steels .as for what you are measuring its the surface hardness in the case of bearings its cheaper to case harden than fully harden.if you heat treat your own knives you should have one otherwise you are only guessing .but mine cost 5 thousand 15 years ago and it was second hand then.the best way for a hobby maker is to send the blades to a heat treatment company.
    wow its a book
    cheers john

  7. #7
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    Basically @EeeBees if you need it to test your steak it's way over done! 😊

    Sent from my SM-G900F using Tapatalk
    EeeBees and Pengy like this.
    Rule 5: Check your firing zone

  8. #8
    Member EeeBees's Avatar
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    some old moth eaten stag fillets...?
    ...amitie, respect mutuel et amour...

    ...le beau et le bon, cela rime avec Breton!...

  9. #9
    Member EeeBees's Avatar
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    ...amitie, respect mutuel et amour...

    ...le beau et le bon, cela rime avec Breton!...

  10. #10
    Member EeeBees's Avatar
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    Quote Originally Posted by Tommy View Post
    Bear in mind that a material can have a surface that's extremely hard, with a softer core (bearing races being a good example)

    What are you measuring ?
    @Tommy, I am not measuring anything...I just love watching videoes on making knives...
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    ...amitie, respect mutuel et amour...

    ...le beau et le bon, cela rime avec Breton!...

  11. #11
    Member EeeBees's Avatar
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    Thank you again...I think I understand now...I watched a video about a Viking sword...they had the sword tested by some steel company; the spokesman for the company said that because of the purity of the ore used and the amount of carbon the maker had added explained why the Viking swords were so tough and durable...obviously the Viking sword makers knew a thing or two!!
    ...amitie, respect mutuel et amour...

    ...le beau et le bon, cela rime avec Breton!...

  12. #12
    Member rossi.45's Avatar
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    this guy is THE MAN of knife making . . to me . .. https://www.youtube.com/watch?v=z7zg1tLHHlw

  13. #13
    Member john worthington's Avatar
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    yep nicks attention to detail is fantastic

 

 

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