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Thread: Mechanical lapping

  1. 01-22-2013, 02:41 AM #11
    Martin103
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    Quote Originally Posted by Hirlau View Post
    No, not really, I was surprised how flat that large table made the surface. 25 minutes tops, two grids drawn with pencil, DMT 325 under running water. It slurries easily.
    Well its not a LI for sure then!
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  2. 01-22-2013, 06:55 AM #12
    adrspach
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    Quote Originally Posted by Hirlau View Post
    ........... my workshop lapped hone.

    Attachment 118779Attachment 118784Attachment 118780Attachment 118781Attachment 118782Attachment 118783
    Now I know what you have. It was the rock from one of the colleagues from Birmingham UK. It is very simmilar To LI but much softer.
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  4. 01-22-2013, 07:11 AM #13
    Margeja
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    See: "Pierre a aiguiser naturelle des Pyrénées" on You Tube

    The have engines to flatten the stone!
    Last edited by Margeja; 01-22-2013 at 07:18 AM.
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    adrspach (01-22-2013), Eddys (01-22-2013), Hirlau (01-22-2013), Lemur (01-22-2013)
  6. 01-22-2013, 07:29 AM #14
    jgkeegan
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    Impressive.

    --james
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  7. 01-22-2013, 07:44 AM #15
    mrsell63
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    Default Mechanical lapping

    You could find a shop that has a Blanchard grinder with diamond bits or use a gem grinding rotary table. This would flatten your stone to the point where a subsequent simple hand lapping would give you the final finish you need.

    Jerry
    ____

    P.S. You might also have luck with a belt sander to lap your stone.
    Last edited by mrsell63; 01-22-2013 at 07:50 AM.
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  9. 01-22-2013, 12:17 PM #16
    Eddys
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    Name: DSCF1224.jpg Views: 199 Size: 23.5 KB

    This is the baby. Not as hard as I thought it might be, so can be lapped as normal. Not sure how fine it is yet.
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  10. 01-22-2013, 01:10 PM #17
    Lemur
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    In the video; Pierre a aiguiser naturelle des Pyrénées - YouTube

    What is he putting on the stone at 7:15?
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  • 01-22-2013, 01:46 PM #18
    ace
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    Quote Originally Posted by Hirlau View Post
    ........... my workshop lapped hone.

    Attachment 118779Attachment 118784Attachment 118780Attachment 118781Attachment 118782Attachment 118783
    You wasn't finger-painting on that bad boy was you?
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  • 01-22-2013, 02:32 PM #19
    Margeja
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    Default Anser for Lemur

    The paste is Colcothar mixed with sheepfat. Colcothar can be used as a paint pigment as well as for grinding and polishing. Contrary to what the name suggests, colcathar is non-toxic.
    Colcothar is a red and purple dye, almost entirely consisting of iron oxide (Fe2O3) and clay soil. It is an artificial mineral pigment. It is extracted from weathered iron ore rock or clay by a process of washing and grinding.
    Colcothar contains about 87% iron oxide and only 10% English Red. These pigments have been used since the ice age.
    See page 41 Grinding and Honing: http://bosq.home.xs4all.nl/info%2020...ing_part_1.pdf
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  • 01-22-2013, 02:43 PM #20
    Lemur
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    Colcothar mixed with sheepfat sounds like the red rouge we use for polishing jewellery.
    I know "red rouge" sounds strange to anyone knowing a bit of french but they come in lots of colors and are all called "rouge", by tradition I guess!

    I'm afraid to look at your papers Margeja, everytime I get stuck in them for hours...
    Last edited by Lemur; 01-22-2013 at 02:46 PM.
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