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Phase II hardness tester

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by Kevin McGovern, Nov 3, 2017.

  1. Kevin McGovern

    Kevin McGovern

    Jul 31, 2015
    Facebook marketplace, I want to have your baby



    IMG_20171103_214218887.jpg
     
  2. Salem Straub

    Salem Straub

    Oct 20, 2008
    Mighty nice!!
     
  3. Kevin McGovern

    Kevin McGovern

    Jul 31, 2015
    $200 of nice my friend! Just need test blocks. I'm thinking I can get a 60 ish certified block if that's close to what I normally shoot for? @Salem Straub
     
    KnuckleDownKnives likes this.
  4. KnuckleDownKnives

    KnuckleDownKnives Time to make the doughnuts..

    Feb 12, 2015
    That's a sweet deal Kevin.
     
    Kevin McGovern likes this.
  5. Kevin McGovern

    Kevin McGovern

    Jul 31, 2015
    Yeah it's actually been listed for a few months. I just decided it was time.
     
  6. Salem Straub

    Salem Straub

    Oct 20, 2008
    $200? You stole it!
    It would be nice to have test blocks from 59 to 63... but 60-62 would be enough probably.
     
  7. Kevin McGovern

    Kevin McGovern

    Jul 31, 2015
    T
    Thanks for the tip. I think it may be reading a bit low. Several blades that should be 62 are reading 60. I tested an old U.S. diamond brand file, it read 64.
     
  8. Kevin McGovern

    Kevin McGovern

    Jul 31, 2015
    I'm finding test blocks with a range of 60-65. Is that accurate enough?
     
  9. Stacy E. Apelt - Bladesmith

    Stacy E. Apelt - Bladesmith ilmarinen - MODERATOR Moderator Knifemaker / Craftsman / Service Provider

    Aug 20, 2004
    A test block should have no more range than .5Rc.
    A 60.0 +/-0.5 block is a good one for checking a knife hardness tester.

    The best, and cheapest, test blocks for you to use are to make up half a dozen 2X2" blocks from 1/4" 1084. Mark the with letters or numbers (A,B,C,1,2,3,etc.) HT them as a batch at 1500F in your oven. Sand the two main surface clean to 400 grit on a flat platen after quench. Keep A/1 as is, and temper the rest for one hour at 300F. Do separate second tempers at 300, 350, 400, 450, 500. Keep a record of the group with all HT specs, times, steps, etc. Touch up on the flat platen and send them to someone with a recently calibrated tester. Use a carbide/diamond scribe or engraver to mark each block with its hardness. This will give you a full range of test blocks for checking your tester and adjusting it.

    Besides getting a good set of reference test blocks, this will give you a real world chart and data sheet of what hardness to expect in 1084 from your equipment at varying tempers.
     
    Last edited: Nov 4, 2017
    Jesse Smith and Justin Schmidt like this.
  10. Kevin McGovern

    Kevin McGovern

    Jul 31, 2015
    Great idea Stacy. And way cheaper!
     
  11. Bigjohn

    Bigjohn

    Sep 30, 2002
    Stacy, who can calibrate a tester in our area?
     
  12. KnuckleDownKnives

    KnuckleDownKnives Time to make the doughnuts..

    Feb 12, 2015
    Look up metrology labs. I just got a tester a couple weeks ago and just learned all this. The dial indicator on mine needed cleaning as it sat up in storage for some years and got gummy. They took it apart cleaned it, installed new crystals lubed and calibrated it for $65. I'm waiting on getting some certified blocks and calibrating it myself, but a metrology lab can do it. Mines reading 3 points low pretty sure based off some blades I had tested on a calibrated tester.

    I would recommend if you go this route to deliver it and pick it up from them yourself if you can as you don't have to worry about a delivery company letting it bounce around in a truck or something.
     
  13. Stacy E. Apelt - Bladesmith

    Stacy E. Apelt - Bladesmith ilmarinen - MODERATOR Moderator Knifemaker / Craftsman / Service Provider

    Aug 20, 2004

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