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Thread: How flat is flat?

  1. #1
    daveb's Avatar
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    How flat is flat?

    I've been fooling around with getting the stones "flatter". I can get within 2mm variance and remove visible dishing by eyeballing stone. I measured stone below after initial flattening.

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    Question is would you flatten further to reduce the variance? I tried with one stone (even found a feeler gauge in the back of the toolbox) and got it to less than 1 mm variance overall and reduced dishing to less than .25mm. But I washed a lot of stone down the drain doing so. I'm thinking this is past the point of diminishing returns and the calipers and feeler gauge can go back to the toolbox.

    Curious as to how others flatten.

    Regards,

    Dave
    Dave
    Older and wider.

  2. #2

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    For me, flatten is done when the dished part is gone. I figure that angle wobbling & pressure deltas are way more destructive than a surface flatness variances.

  3. #3
    Quote Originally Posted by bluntcut View Post
    For me, flatten is done when the dished part is gone. I figure that angle wobbling & pressure deltas are way more destructive than a surface flatness variances.
    Wow - 'angle wobbling & pressure deltas' - I have to say that's some impressive vocabulary.

    Well done. That about sums it up!

  4. #4
    Senior Member chinacats's Avatar
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    I mark mine with a pencil and flatten until I no longer see any pencil marks--don't lose too much stone that way and it finishes flat every time.

    Cheers!
    once in a while you get shown the light, in the strangest of places if you look at it right

  5. #5

    Zwiefel's Avatar
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    Quote Originally Posted by chinacats View Post
    I mark mine with a pencil and flatten until I no longer see any pencil marks--don't lose too much stone that way and it finishes flat every time.

    Cheers!
    +1....probably nobody here is going to learn anything from me though!
    Remember: You're a unique individual...just like everybody else.

  6. #6
    I use an Atoma 400 and find that feel is better than markings. I haven't used a DMT, but have read how it sticks a bit when flattenting. I've found with my Atoma that it only does that when I've really hit the flat point, generally speaking. If dished it doesn't stick and I can feel the uneveness. If flat, it has a stuck all-contact feeling, and testing with pencils has helped prove this.

  7. #7
    daveb's Avatar
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    Quote Originally Posted by Cutty Sharp View Post
    Wow - 'angle wobbling & pressure deltas'
    I knew zactly what he meant and he's prob right.

    Thanks all for feed back so far.
    Dave
    Older and wider.

  8. #8
    Canada's Sharpest Lefty Lefty's Avatar
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    I hate flattening, and it hates me! For knives, I'm in the Carter camp. Razors...I hate my life.
    09/06

    Take a look around at: www.sharpandshinyshop.com

    Email me at: tmclean@sharpandshinyshop.com

  9. #9
    Senior Member Birnando's Avatar
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    I'll do a proper initial lapping of all new hones.
    After that I only do a few figure 8's with a Shapton DGLP or a DMT.
    That way the stones always stay clean, and reasonable flat.
    I do this both with my razor and knife stones.

  10. #10
    Canada's Sharpest Lefty Lefty's Avatar
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    I need to start doing that. My rhomboids and lower pectorals still hurt from my two hour flattening session.
    09/06

    Take a look around at: www.sharpandshinyshop.com

    Email me at: tmclean@sharpandshinyshop.com

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