Tip grinding

岩石研磨その１

Old_version(古い版)：http://yossi-okamoto.net/Thin-Sections/Rock_cut1/index.html
http://seagull.stars.ne.jp/2018_Thin_Section/index_part2.html

Using homemade rock-grinding table based on a kitchen knife sharpener, Click image to video.
自作の岩石研磨機を用いる．

Ref. The making recipe for my homemade rock saw: http://seagull.stars.ne.jp/2020_Thin_Section/Grinder_P/Grinder_P.html
岩石研磨機の作り方は上記リンク

<Preparation> 準備物

Diamond disks: grit #180, #320, 180mmx1mm thickness 20USD each
https://www.amazon.co.jp/gp/product/B07GBVW57X/ref=ppx_yo_dt_b_asin_title_o03_s00
ダイヤモンド研削盤 #180, #320, 外径180mmx1mm厚　\2000

Glass plate x2 30x20cm 8-10mm thickness about 10-20 USD each
Abrasive: Carborundum #800 500g Alundum #1500 250g about 15-30 USD each
https://www.monotaro.com/g/04473003/
https://www.monotaro.com/g/04473005/
ガラス板（普通ガラス厚板29x19cmx8mm厚，コダマガラスで入手，１枚１０００円見当）
研磨剤カーボランダム(#800　500g），アランダム(#1500　少量)　モノタロウなどで入手 \3000 \1650

Photo From Amazon

Photos from Monotaro

Grinding with the modified knife sharpener

#180 grit diamond plate (purchased from Amazon), within 1min.(Until saw scratches are erased). Samples are gabbros at Murotomisaki, Shikoku. #180のダイヤモンド砥石１分以内（鋸目が取れるまで），サンプルは四国室戸岬のはんれい岩 https://youtu.be/qCSWIWrc14o	#180 to #320 diamond disks change.(revers screw & nut) ダイヤモンド板の交換（逆ネジに注意）

#320 grit diamond disk (purchased from Amazon), within 1min. #320ダイヤモンド砥石摺り１分以内	The surface change of #180 and #320. Diorite Mie Click to enlarge #180と#320の表面のちがい．クリックして拡大．

Grinding with hand
手摺り

#800 Carborundum + water on a glass plate (8mm Thickness), 3min. カーボランダム＋水ガラス板（8mm厚）３分間	#1500 Alundum + water on a glass plate (8mm Thickness), 3min. アランダム＋水ガラス板（8mm厚）３分間

Surface change of #320(by tool) to #800 (by hand) Hidaka Norite, Click to enlarge #320（機械摺り）と#800（手摺り）の表面の違い．	Surface change of #800 to #1500 (both by hand) Hidaka Norite, Click to enlarge #800と#1500（いずれも手摺り）の表面の違い．

Important point!: Check the surface with reflecting light: flat and no scratches (scars)

Then, next stage---->