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Needle File Set: Six Small Files Cut by Hand
Needle files are small files for fine work, where a good finish matters more than speed, sold in sets of shapes: pillar, half round, barrette, square, round and triangular. They are made like any file, only smaller and with finer teeth: forged, annealed, cut tooth by tooth with a chisel, and hardened in brine.
The picture: our diagram, six tapered needle files and their cross-sections.
高级
Three days
说明
1
1
Forge six blanks
Forge six blanks
Draw tool steel to six thin blanks, each with a tapered part for the teeth and a round handle part. Shape the sections in the swage block: pillar (narrow flat), half round, barrette, square, round and triangular.
此步骤所需材料：
工具钢八角钢0.15 公斤
木炭2 as required所需工具：
铁匠炉
铁砧
横向楔头锤
型砧块
铁匠钳
电焊手套
安全眼镜2
2
Anneal and true
Anneal and true
Anneal the blanks: no hotter than blood red, cooled very slowly out of the air. Grind and file the faces true, or the teeth will not be even.
所需工具：
铁匠炉
旋转磨石
金属锉3
3
Cut the teeth
Cut the teeth
Raise fine teeth with the file-cutting chisel, one blow and a small even step at a time, under a loupe. Turn each blank on the pewter plate to cut the next face. On the barrette cut only the flat face; leave the other sides smooth (safe).
所需工具：
錾锉錾横向楔头锤铁砧
锡镴垫板
放大目镜4
4
Harden, do not temper
Harden, do not temper
Heat each file evenly to its hardening heat and plunge it into cold brine. Then reheat the handle part alone so it is not glass-hard.
此步骤所需材料：
盐0.5 公斤
水5 升所需工具：
铁匠炉
水桶铁匠钳电焊手套安全眼镜5
5
Steel for a set of six
Steel for a set of six
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