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  1. #1
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    Default Naniwa Lapping plate - NOT flat.

    I recently purchased a Naniwa 220 grit lapping plate and the damn thing isn't flat. It has a high spot in the middle. Anybody else experience this?
    The only upside is the bottom seems to be flat.

  2. #2
    I used Nakayamas for my house mainaman's Avatar
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    as any new stone could be not perfectly flat, so are the lapping plates. Those naniwas are notorious for dishing fast, a better otion for lapping would be a 320 DMT.
    Stefan

  3. #3
    Senior Member blabbermouth JimmyHAD's Avatar
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    I would get with the vendor. Forum member Blaireau loves the naniwa lapping plate and he is a hone collector who actually enjoys lapping his hones to assess the quality of the slurry.
    Be careful how you treat people on your way up, you may meet them again on your way back down.

  4. #4
    Senior Member kevint's Avatar
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    how did you test it and how far out is it?

  5. #5
    Know thyself holli4pirating's Avatar
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    Lapping stones are another type of whetstone - they should be lapped initially and periodically. Lapping plates (like the DMT's) avoid this, but they can wear out, so that is their downside.

  6. #6
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    Thanks for the feedback.
    I tested it a couple of ways. I first noticed it when I was lapping my new Naniwa 12K. I put a series of grids as per the tutorial found here and stated lapping. I noticed the grid in teh centre of the hone was wearing off quite nicely but the ends/edges were taking forever. I finally managed to get get all the grid removed by lapping and thought the 12k was ready ready for use. I put my 5/8" Gotta on the stone and the damn thing wouldn't sit flat and I couldn't keep it flat on any pass. That got the old gears in my skull turning...so I decided to lap my 1k, 5k and 8k. Drew the same grid and started my lapping. Same result as with the 12k; centre wear first. And these were already perfectly flat as I had lapped them a month ago on a nice thick piece of tempered glass with 320 grit wet and dry.
    My next step was to go put the lapping plate on my glass shower door. SUre enough, there was a slight wobble when applied to the glass. I turned it over and the bottom was perfectly flat against the glass and wothout wobble.
    I went back to the lapping station (my bathroom that my wife calls my mancave) and lapped Naniwas with the bottom of the plate. When I was done, my Gotta sat perfectly flat on the 12k and even created the "suction" feeling when doing passes.
    To finally make sure I wasn't losing my mind, I brought the plate to work with me this morning and checked it using a number of things in our engineering workshop that I know are machined perfectly flat.
    The result was a high spot in the middle.

    Sorry for being so long-winded but I thought I'd better explain what I did and what the results were.

    I live in New Zealand and bought it in the US when I was there a few weekks ago, so returing it to the shop I bought it from is a "no go". I might have to chalk this one up to experience and put it in the bin, then go buy a DMT.

  7. #7
    Senior Member kevint's Avatar
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    nice an through. good job. try lapping the lapper on 80 grit with your glass reference.

  8. #8
    There is no charge for Awesomeness Jimbo's Avatar
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    Nothing a few delicate taps with a 30 pound sledge won't fix.

    James.
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  9. #9
    Never a dull moment hoglahoo's Avatar
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    Quote Originally Posted by Jimbo View Post
    Nothing a few delicate taps with a 30 pound sledge won't fix.

    James.
    Just because it worked on your head, doesn't mean it will work on a lapping plate. Fiddy.
    Find me on SRP's official chat in ##srp on Freenode. Link is at top of SRP's homepage

  10. #10
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    Quote Originally Posted by Jimbo View Post
    Nothing a few delicate taps with a 30 pound sledge won't fix.

    James.
    Just a gentle tap. A little "persuasion".

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