Likes Likes:  0
Results 1 to 9 of 9

Thread: Strange iaito problem

  1. #1
    Join Date
    Jul 2004
    Location
    Kaneohe, Hawaii, USA
    Posts
    867
    Likes (received)
    35
    Blog Entries
    1

    Default Strange iaito problem

    I've trained in MJER for many years, & am now having a very weird problem with my iaito. Both this blade & my last one are aluminum-beryllium, & about 2.4-shaku. On one side of the mune - only - there are developing a string of what look like chips, but are actually small, evenly-spaced openings in the burnished metal. I had to retire my last blade because of the damage it did to my hand during noto, especially in Okuden waza, & now this fairly new blade, less than 3 years old, is developing exactly the same problem. Both Sensei & I have looked at it, & neither of us has a clue as to why it's happening.

    Under magnification, it almost looks like gremlins have chipped away at the mune's surface on the one side, but the other side is perfectly smooth. I've eliminated things like a defect in the koiguchi or inside the saya, but other than that, I don't have a clue why my blades are essentially retiring themselves. Both are fairly customized, & although I could of course go to steel, I really don't want to put any more strain on my rebuilt shoulder.

    Has anyone else experienced this, or have any idea what may be causing it?

    Thanks!
    Ken
    Ken Goldstein
    --------------------------------
    Judo Kodansha/MJER Iaido Kodansha/Jodo Oku-iri
    Fencing Master/NRA Instructor

    "A positive attitude may not solve all your problems, but it'll annoy enough people to be worth the effort."

  2. #2
    Join Date
    Sep 2003
    Location
    Seattle, Washington, USA
    Posts
    6,226
    Likes (received)
    117

    Default

    I would have suspected pitting from exposure to salt (sweat, sea breeze, etc.), but the "evenly spaced" part would seemingly rule that out. Very curious!
    Yours in Budo,
    ---Brian---

  3. #3
    Join Date
    Jul 2004
    Location
    Kaneohe, Hawaii, USA
    Posts
    867
    Likes (received)
    35
    Blog Entries
    1

    Default

    Yeah, Brian, my wife & I are both engineers, but still don't have a clue what's happening. If both sides of the mune were pitting, I could at least understand it, but just one? My wife's blade, bought from the same place at the same time, is just fine, BTW.

    It's not that I can't afford to replace a blade, but really don't WANT to!

    Ken

  4. #4
    Join Date
    May 2000
    Location
    JAPAN
    Posts
    1,613
    Likes (received)
    106

    Default

    Quote Originally Posted by Ken-Hawaii View Post
    Yeah, Brian, my wife & I are both engineers, but still don't have a clue what's happening. If both sides of the mune were pitting, I could at least understand it, but just one? My wife's blade, bought from the same place at the same time, is just fine, BTW.

    It's not that I can't afford to replace a blade, but really don't WANT to!

    Ken
    Sounds like the plating is very thin. What do you use to clean it Ken?
    Hyakutake Colin

    All the best techniques are taught by survivors.


    http://www.hyoho.com

  5. #5
    Join Date
    Jul 2004
    Location
    Kaneohe, Hawaii, USA
    Posts
    867
    Likes (received)
    35
    Blog Entries
    1

    Default

    A soft piece of toweling with some oil, pretty much the same thing I use to clean my Nihonto.

    Ken

  6. #6
    Join Date
    May 2000
    Location
    Blue Ridge, Texas
    Posts
    1,991
    Likes (received)
    122

    Default

    If I had to guess, I would say that there was some contamination on either the aluminum alloy core when they applied the copper plating, or on the copper when they applied the chrome plating. Have you tried talking to the company that made the sword? They may offer at least a discount on a replacement blade.
    I've seen several iaito that have developed problems with the chrome plating not adhering properly, and it always seems to be somewhere around the kissaki.
    Paul Smith
    "Always keep the sharp side and the pointy end between you and your opponent"

  7. #7
    Join Date
    Jul 2004
    Location
    Kaneohe, Hawaii, USA
    Posts
    867
    Likes (received)
    35
    Blog Entries
    1

    Default

    Linda & I also assume the contamination, Paul, but these were blades from two different companies, one I had custom-made in Tokyo, & the other earlier blade from Tozando, with exactly the same problem. Just doesn't make any sense! I did send photos to Tozando, who told me that they'd never seen this happen before, & suggested I go to a steel blade.

    I'm hoping that I can find one or two more people with the same problem so that I can start looking for commonalities. Frustrating!

    Ken

  8. #8
    Join Date
    Sep 2003
    Location
    Seattle, Washington, USA
    Posts
    6,226
    Likes (received)
    117

    Default

    Ken, are you able to wear watches without any problems?
    Yours in Budo,
    ---Brian---

  9. #9
    Join Date
    Jul 2004
    Location
    Kaneohe, Hawaii, USA
    Posts
    867
    Likes (received)
    35
    Blog Entries
    1

    Default

    Ha! Yes, Brian, although the one I usually wear is 18 kt. But I have a plain old steel band on another watch I wear often enough that I'd notice any sign of corrosion. And I have the advantage of being a chemical engineer myself, & my wife is a chemist.

    Again, if the problem was on BOTH sides of the mune, I'd have a lot more to work with!

    Ken

Similar Threads

  1. Strange but true
    By stevenm in forum Shorinji Kempo
    Replies: 1
    Last Post: 10th December 2010, 22:45
  2. strange students
    By william northcote in forum Ninpo and Ninjutsu
    Replies: 15
    Last Post: 14th February 2003, 19:06
  3. Strange etiquette
    By gnoble in forum Dojo Management
    Replies: 0
    Last Post: 20th August 2001, 19:06

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •