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Sandstone Whetstone
Before bonded abrasives, edges were sharpened on natural stone, and fine sandstone was the commonest. A piece is shaped to a block and one face is ground dead flat by rubbing it on a flat slab with sand and water. Used wet, its quartz grains cut steel. Sandstone cuts fast but coarse: finish an edge on a finer stone.
初学者
Half a day
说明
1
1
Choose the stone
Choose the stone
Pick a piece of fine, even-grained sandstone without cracks or soft layers, a little bigger than the block you want.
此步骤所需材料：
砂岩（磨料）2 公斤2
2
Shape a block
Shape a block
Wearing glasses, trim it to a rough block about 200 by 60 by 30 mm with the chisels and hammer.
所需工具：
石雕凿
石雕锤
安全眼镜3
3
Flatten the face
Flatten the face
Sprinkle sand and water on a large flat stone and rub the stone's face on it in figure-eights until the straightedge shows no light under it.
此步骤所需材料：
砂0.5 公斤
水2 升所需工具：
大扁石
直尺规4
4
Test it
Test it
Soak it in water and hone a dull knife on it: the edge should come up keen but coarse.
此步骤所需材料：
水2 升所需工具：
碗
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