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Forged Lathe Cutting-Off (Parting) Tool
A cutting-off or parting tool cuts a narrow groove in work turning on a lathe, and so cuts it off. It is forged from 1/2 × 1-inch tool steel 7 inches long, with a thin blade about 1½ inches long set flush with one side of the bar. Because it cuts only at its very end, the blade is made thickest at the edge and tapers back, so its sides clear the groove. It is hardened like a cold chisel and tempered to light yellow.
中级
1–2 hours
说明
1
1
Cut and mark
Cut and mark
Cut the stock to length and centre-punch it.
此步骤所需材料：
工具钢扁钢1 个所需工具：
中心冲
热錾2
2
Draw out the blade
Draw out the blade
Mark with a 1/2-inch fuller and draw out the blade, fullered side down, with a hand hammer on the anvil's rounded edge or under a trip hammer.
所需工具：
铁匠炉
压槽铁（fuller）
锻打锤
凸轮锻锤
铁匠钳3
3
Taper the sides
Taper the sides
Taper the sides of the blade so it is thickest at the cutting end, giving clearance in the groove.
所需工具：
锻打锤
铁砧4
4
Trim
Trim
Cut off the end of the blade at an angle with a hot chisel.
所需工具：
热錾5
5
Harden and temper
Harden and temper
Harden the blade the same way as a cold chisel; heat it back past the blade and cool only the blade, then polish and let the colours run until the tip is light yellow, and cool it.
所需工具：
铁匠炉
淬火水桶
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