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Thread: Why lapping film rules

  1. #61
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    Here is a general little formula that I picked up somewhere on the forum a while back. It is a pretty good approximation.

    Estimated Microns = 14755/Grit

    for a 30k stone for instance

    Estimated Microns = 14755/30,000
    = 0.491 microns

    Take Care,
    Richard

  2. #62
    Senior Member ferroburak's Avatar
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    Quote Originally Posted by riooso View Post
    Here is a general little formula that I picked up somewhere on the forum a while back. It is a pretty good approximation.

    Estimated Microns = 14755/Grit

    for a 30k stone for instance

    Estimated Microns = 14755/30,000
    = 0.491 microns

    Take Care,
    Richard
    Hi,
    Well with this calculation it seems 2 micron would be good for honing. Is there a 2 micron diamond lapping film? Thanks.

  3. #63
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    Quote Originally Posted by ferroburak View Post
    Hi,
    Well with this calculation it seems 2 micron would be good for honing. Is there a 2 micron diamond lapping film? Thanks.
    Yes. 3M makes 2 micron Al2O3 films:
    http://multimedia.3m.com/mws/mediawe...6EVs6E666666--

    I just found that 1 and 3 µm films are easier available.

  4. #64
    Member leonidas's Avatar
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    ... does anyone know where i can find a video of how to use lapping film??

    ........i've read the thread, but if i don't see it being done, i don't want to try it....

    .......thanks in advance......

  5. #65
    Senior Member Lesslemming's Avatar
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    You really do not need a video explanation. All the actions are exactly the same as with a "normal" stone.

    All you need is a flat surface like a glass tile, or granite or similar.
    If you have the PSA version: stick hte film to the subtsrate via the pressure sensitive adhesive.
    If you have the non PSA version: wet the film and the substrate and the film will stick automatically.

    Either way, wet the film afterwards and consider it a normal stone that does not need lapping, but will wear in time.
    Carefully sharpen your razor in any direction you want

    the desired lapping film grits are:

    5µm for resharpening, quick and agressive like a 2k stone
    3µm for prepolishing, quick but smoother. Like a 5k stone
    1µm for absolute polish, quick, extremely smooth, extreme high polish

    (keep in mind: these "grit to JIS" comparisons are made via my own experience. Do not get confused too much with the numbers and grit ratings)
    Last edited by Lesslemming; 03-26-2012 at 05:29 PM.

  6. #66
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    ...Lesslemming, thank you for the great information....

    ..........and even moreso for taking the time to write it all down.........

    .........much appreciated.........

  7. #67
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    You do need to be careful with the higher grit films. When you hone edge into them and not trailing, they are very easy to cut.

    Have fun.

  8. #68
    Norton convert Blix's Avatar
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    I've done a few razors lately with some lapping film I got for free. I've used them just as any other hone, all edge leading.
    Some suggested a trick using a sheet of wet paper under the final grit for the finishing, which have worked out quite good.

    Very very nice edges off the film, good stuff for anyone on a budget, quite portable as well.
    Disburden likes this.

  9. #69
    I Bleed Slurry Disburden's Avatar
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    I use a damp piece of paper under films and it acts as a great cushion.
    Film is probably the most effective hone I have used to date, it just isn't fun like stones are...
    But they're extremely fast and efficient, a monkey can use them.

  10. #70
    Senior Member BenjamanBarker's Avatar
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    i have read a bunch about lapping film but where can i get it?? and are there some grits you just shouldn't use?

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