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Taps and Dies Cut on the Lathe, with Wrench and Stock
A tap cuts the thread inside a hole; a die cuts it on a rod. Makers made their own in the 16th and 17th centuries. Cut the thread on tool steel in the screw-cutting lathe, file flutes so it cuts, harden it, and use the finished tap to cut the thread in a steel blank that becomes the matching die. A T-wrench turns the tap, a stock holds the die.
The picture: a tap held in a T-wrench.
高级
Two days for a few sizes
说明
1
1
Turn and thread the tap
Turn and thread the tap
Turn tool steel to the thread's major diameter with a square on the end for the wrench. Cut the thread in the lathe at the right pitch and check it with the gauge. Taper the first 8–10 threads for a taper tap, or 3–5 for a plug tap.
此步骤所需材料：
工具钢八角钢1 个
切削油0.05 升所需工具：
金属车床
高速钢木车刀套装
螺纹规
6 英寸数显卡尺2
2
Flute and harden the tap
Flute and harden the tap
File three or four lengthwise flutes along the thread so it has cutting edges and room for chips. Harden in water from cherry red and temper to brown.
此步骤所需材料：
水10 升
木炭1 as required所需工具：
金属锉
台虎钳
铁匠炉
淬火水桶
铁匠钳
安全眼镜3
3
Cut the die with the tap
Cut the die with the tap
Drill a flat tool-steel blank to the tap drill size and run the finished tap through it with oil. Drill clearance holes round the thread so it cuts, saw one side open so it can be set, then harden and temper it to brown.
此步骤所需材料：
工具钢扁钢1 个所需工具：
手摇钻台虎钳金属锉铁匠炉淬火水桶4
4
Wrench and stock
Wrench and stock
Forge and file a T-wrench with a square hole for the tap, and a die stock from flat bar with a round recess for the die, two handles and a set screw.
此步骤所需材料：
低碳钢扁钢1 个所需工具：
铁匠炉金属锉手摇钻台虎钳5
5
Tap drill sizes
Tap drill sizes
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