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Brass Reed Shim Rolled Thin and Left Spring-Hard
Reeds and small springs want thin brass that springs back. Roll brass sheet thinner a little at a time, annealing when it stiffens, and leave the last passes unannealed: cold rolling hardens brass, and that hardness is the spring.
The picture: a corroded brass reed plate from a harmonica of the American Civil War era (US National Park Service).
中级
Half a day
说明
1
1
Anneal the sheet
Anneal the sheet
Cut a strip from the brass sheet, heat it on fire bricks to a dull red and quench it in water.
此步骤所需材料：
黄铜板1 个
水5 升所需工具：
铁皮剪
丙烷喷灯
耐火砖
铁匠钳
淬火水桶2
2
Roll it down
Roll it down
Pass it through the rolling mill, closing the rolls a little each pass. When it stiffens and starts to crack at the edges, anneal it again.
所需工具：
轧机
6 英寸数显卡尺丙烷喷灯淬火水桶
安全眼镜3
3
Finish hard
Finish hard
For the last few passes do not anneal. Roll to the reed thickness, often a few tenths of a millimetre, and check it at several points.
所需工具：
轧机6 英寸数显卡尺4
4
Clean and cut
Clean and cut
Lift the oxide in vinegar with salt, scrub, rinse and dry. Cut it into reed blanks with snips.
此步骤所需材料：
醋0.5 升
盐20 克所需工具：
碗
钢丝刷套装铁皮剪5
5
Pass schedule
Pass schedule
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