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  1. #1
    Join Date
    Jun 2005
    Location
    Sydney
    Posts
    3,096

    Default Sigma Power Ceramic 120grit waterstone aka 'the black beast'

    Here is an unknown maker socket 'firmer'... used as a cold chisel by some goose.
    Chips out of the blade mean I need to take off about 4mm.

    Hello Schtoo from Japan's just arrived Sigma Power Ceramic 120 grit waterstone.

    lets meet...

    Chomp.

    140 strokes freehand and 40 with the veritas MII sharpening jig. Thats a 25 degree bevel, 1" wide, 3 - 4 mm of chip taken out. Do the geometry and its a lot of metal, as shown by the swarf in the pics. A hungry stone.
    A bit dished, but nothing the intermediate stone won't handle on the chisel, or I could use the carbide grit that comes with the stone to flatten it, give it a few more strokes and then move on.

    I can't get a bench grinder at the moment... so this stone is filling the 'hole'.... less than 10 minutes and the chip is gone.

    Schtoo's blog will fill you in on his tests on water stones (he does a very good comparison) along with a 'pro's and con's blog, and he did tell me that grinding out a blade is a waste when you can buy another (and a bench grinder may be cheaper as well)... but.... this is a hungry stone that works well, and $23 + postage. About 10 stones to the benchgrinder and a wheel?

    Thanks Schtooo... all round good advice and good service.
    Cheers,
    Clinton

    "Use your third eye" - Watson

    http://www.flickr.com/photos/clinton_findlay/

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  3. #2
    Join Date
    Apr 2005
    Location
    Japan。
    Age
    49
    Posts
    1,622

    Default

    Thou must have been taking one's time...


    For extra credit, add some #120 SiC grit to the stone and grind away. Chops the time down by half, and potentially faster than a bench grinder, since you can lean on the stone VERY hard and no risk of burning the steel at all.

    And the #120's passing through now are of the last batch. I think they're sweet as they are, but I inadvertently requested the kiln driver to 'make them HARD', so it's back to the old, hard ones.

    Which shred steel.

    Glad to know the stone worked like it was supposed to, and thank you.

    Stu.

  4. #3
    Join Date
    Jun 2005
    Location
    Sydney
    Posts
    3,096

    Default

    Its all good Schtoo, you took the time to work out what I was after, and it is does its job very well... I'll try it with some carbide grit if I have that size on hand (and can find it).
    Thanks.
    Cheers,
    Clinton

    "Use your third eye" - Watson

    http://www.flickr.com/photos/clinton_findlay/

  5. #4
    Join Date
    Jul 2010
    Location
    Italy
    Age
    51
    Posts
    65

    Default

    the chisel bevel seems not so entirely square...

    but after all, it's really a good work! just a silly question: is the stone really flat? i.e. it's possible to flatten the back of a blade with no worries 'cause the stone is too rough and then maybe not so suitable to flatten things??

    thanks
    Cheers,
    Luca

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