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Spyderco Bradley Folder (prev. Gayle Bradley) with CPM-M4 edge retention demonstration.

by Jack Haskins, Jr.

Feb 21, 2014

I was going to make some videos of knives at different sharpnesses to show how I judge sharpness.  On forums it's hard to "see" what someone means when they talk ab out some things.  But I found this out and decided to do a video on just the edge retention of the M4 on the GB.  This is one of my first videos so please forgive the darkness or poor quality.

http://www.youtube.com/watch?v=auBEgSmKApc

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    Jack Haskins, Jr.

    I forced a patina on my GB blade the other day.  Patina (which is good corrosion) is supposed to help prevent bad corrosion (rust).  That may help with the staining but your blade will be much darker.  Tuf-Glide is great for corrosion control.  In fact I used Tuf-Glide on my GB when I first got it. I tried to force a patina on it then but was unable to.  The Tuf-glide and cloth made it impossible to force a patina which is a form of corrosion as I understand it.  If Tuf-glide makes it hard to intentionally cause corrosion, I feel pretty safe about it protecting against rust.

    I should have posted a couple of other videos I did right after I made the GB one on edge retention.  They were a Cold Steel Mini-lawman and an  Opinel with a carbon blade.  They did ok I guess but they got dull MUCH MUCH sooner than the M4 did.  I'll try to post them just for comparison.

    Jack

    Feb 22, 2014

  • up

    Jack Haskins, Jr.

    Cold Steel mini-lawman with AUS-8A blade steel and Opinel w/carbon blade videos for comparison to the CPM-M4.

    http://s800.photobucket.com/user/jackknifeh/media/Sharpening/DSCN54...

    http://s800.photobucket.com/user/jackknifeh/media/Sharpening/DSCN54...

    Feb 22, 2014

  • up

    Jack Haskins, Jr.

    I think CPM-M4 may be the best blade steel I've used.  Stays sharp and is easy to sharpen.  Another blade steel that stays sharp a long time is ZDP-189 but it can be a bear to sharpen.  For that steel (HRc around 64-66) you need really good, clean stones.  Even then it take a while because less steel is removed per stroke.  M4 is MUCH easier to sharpen and takes a razor edge that is hard to beat.  Probably why  it is used in competition.  I can't think of a better recommendation for a blade steel than it being chosen for competition.  The only other good recommendation might be if  someone makes a video of scraping a really nice edge on a really great knife across a metal work bench he made. LOL  I don't think I need to share how I "felt" as I scraped the edge along the metal. :)

    Jack

    Feb 22, 2014