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Gemstones, Minerals & Fossils
Lapidary
Home Made Slant Cabber
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<blockquote data-quote="Dihusky" data-source="post: 558585" data-attributes="member: 10304"><p>There was an interesting article in Facet Talk a few months ago discussing the depth of damage to a stone based on grit size. It was based on Quartz so the figures will vary according to the hardness and brittleness of the material your cutting.</p><p></p><p>80 grit, damage 2.6mm deep, 180 grit - 0.86mm deep, 220 grit - 0.6mm, 325 grit - 0.3mm, 600 grit - 0.16mm, 1200 grit - 0.07mm, 3000 grit - 0.03mm. </p><p></p><p>What this means it if you cut with 80 grit then go to 180 grit to remove the 80 grit scratches, you will be cutting to a minimum depth of 3.46mm ( 2.6 + 0.86). This is why you have to select the laps carefully as you have to remove all the damage/pitting & scratches from the previous lap before going finer otherwise you'll be hard pushed to get a really good polish.</p><p></p><p>You'll enjoy watching the development of your first stone, make sure you have a good magnifier.</p></blockquote><p></p>
[QUOTE="Dihusky, post: 558585, member: 10304"] There was an interesting article in Facet Talk a few months ago discussing the depth of damage to a stone based on grit size. It was based on Quartz so the figures will vary according to the hardness and brittleness of the material your cutting. 80 grit, damage 2.6mm deep, 180 grit - 0.86mm deep, 220 grit - 0.6mm, 325 grit - 0.3mm, 600 grit - 0.16mm, 1200 grit - 0.07mm, 3000 grit - 0.03mm. What this means it if you cut with 80 grit then go to 180 grit to remove the 80 grit scratches, you will be cutting to a minimum depth of 3.46mm ( 2.6 + 0.86). This is why you have to select the laps carefully as you have to remove all the damage/pitting & scratches from the previous lap before going finer otherwise you'll be hard pushed to get a really good polish. You'll enjoy watching the development of your first stone, make sure you have a good magnifier. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Home Made Slant Cabber
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