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Problems with lapping 0.5 and 0.1 micron

Recent Forums Main Forum Techniques and Sharpening Strategies Problems with lapping 0.5 and 0.1 micron

This topic contains 9 replies, has 5 voices, and was last updated by  Josh 08/20/2018 at 10:20 am.

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  • #47052

    jabas2000
    Participant
    • Topics: 3
    • Replies: 24

    I have the problem that 0.5 and 0.1 gifs more scratches.

    the fist 2 are till 1 micron lapping.

    Photo 3 is 0.5 micron

    Photo 4 is 0.1 micron.

    Jan

     

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    #47057

    MarcH
    Moderator
    • Topics: 58
    • Replies: 1799

    Jabas2000, two questions:

    1. Was the knife sharp?
    2. Did the apparent scratches laid down by the 0.5 and 0.1 micron DLF increase in appearance as you continued to stroke with them? (i.e., get worse)?

    BTW: here is a link to a similar subject matter Wicked Edge Post I started some time back.

    Marc
    (MarcH's Rack-It)

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    #47058

    tcmeyer
    Participant
    • Topics: 33
    • Replies: 1813

    The link Marc provides refers to a situation where several sharpeners reported having scratches being introduced by the 0.5 micron film. so that might very well be happening here.

    I have found that polishing over scratches left by a previous grit tends to exaggerate the depth of the scratches.  This makes it seem as though the polishing is introducing new scratches when it really doesn’t.  To be sure, you should reverse the direction of each successive grit so you can be sure of exactly when the scratches were laid down and by what grit.  Polishing will only remove the faintest of scratches, so it’s the deeper scratches which tend to be amplified.

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    #47118

    Josh
    Participant
    • Topics: 89
    • Replies: 1669

    I have had the same experience and I’m confident it’s coming from the films … I’ve tried many different film manufacturers and they are all the same at 1um or less. That’s why I stop at 3.5um and switch to strops down to  .25um now.

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    #47137

    MarcH
    Moderator
    • Topics: 58
    • Replies: 1799

    I have had the same experience and I’m confident it’s coming from the films … I’ve tried many different film manufacturers and they are all the same at 1um or less. That’s why I stop at 3.5um and switch to strops down to .25um now.

    Josh, which strop medium do you prefer? (Cow leather, Kangaroo, or Nano Cloth).  Just to verify, you said you strop down to 0.25µ or did you mean to write 0.025µ?  How much of an angle decrease do you come off the sharpening angle when you are stropping? Thanks

    Marc
    (MarcH's Rack-It)

    #47210

    Josh
    Participant
    • Topics: 89
    • Replies: 1669

    Marc,

     

    I’ve tried just about every stropping material out there and prefer/use a nano cloth type material as it’s manufactured very precisely and has the most potential for zero contamination.

    I strop down to  .25u (quarter micron) and do not decrease the angle at all as the cloth is very thin with almost no give. The small amount of micro convexity it does have is not a bad thing imho.

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    #47212

    MarcH
    Moderator
    • Topics: 58
    • Replies: 1799

    Josh, is there any difference in technique loading the nano cloth strops and using them as compared to regular old cow leather strops?  (I got it, the same angle as sharpening angle). How much pressure do you exert?  What kind of care and maintenance is required with the nano cloth?  Anything else you can share? Thanks

    Marc
    (MarcH's Rack-It)

    4 users thanked author for this post.
    #47371

    Josh
    Participant
    • Topics: 89
    • Replies: 1669

    Josh, is there any difference in technique loading the nano cloth strops and using them as compared to regular old cow leather strops? (I got it, the same angle as sharpening angle). How much pressure do you exert? What kind of care and maintenance is required with the nano cloth? Anything else you can share? Thanks

    No difference in technique – just paste em up and use them. Pressure is relative to the user but I use what I would consider medium force. No care and maintenance other than keeping them free from contamination. Even w/ the strops I will get a random scratch here and there and have to spend extra time stropping until it’s minimized – I spend more time stropping than w/ the actual stones probably. Maybe 400-500 passes total.

     

    • This reply was modified 1 year ago by  Josh.
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    #47378

    Organic
    Participant
    • Topics: 17
    • Replies: 839

     I spend more time stropping than w/ the actual stones probably. Maybe 400-500 passes total.

    Wow, that’s a lot more passes than I have been doing with my strops. Is that a total for your whole strop progression, or is that 400-500 passes per individual strop grit?

    Beautiful work as always

    3 users thanked author for this post.
    #47379

    Josh
    Participant
    • Topics: 89
    • Replies: 1669

    total between 2 strops

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