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Secateurs: Forged Bypass Pruning Shears with a Spring and Catch
Secateurs, credited to Bertrand de Molleville around 1813, are one-hand shears for live wood. The bypass kind has a sharp blade that slides past a hooked counter-blade like scissors, cutting cleanly without crushing; a spring opens the handles and a catch holds them shut. Forge the two halves, harden the blade, rivet the pivot, and fit the spring and catch.
The picture: 19th-century secateurs with a leaf spring between the handles, from Baltet's L'art de greffer.
高级
Two days
说明
1
1
Forge the halves
Forge the halves
Forge two halves from tool steel: one with a curved cutting blade, one with a thicker hooked counter-blade, each with a flat boss for the pivot and a handle about 15 cm long (our size).
此步骤所需材料：
工具钢八角钢0.5 公斤
木炭3 as required所需工具：
铁匠炉
铁砧
横向楔头锤
铁匠钳
电焊手套
安全眼镜2
2
Fit and rivet
Fit and rivet
Anneal, file the inner faces of the blades flat so they slide close past each other, drill the bosses and rivet them with a firm but free pivot.
此步骤所需材料：
钢铆钉1 个所需工具：
铁匠炉
金属锉
台虎钳
手摇钻横向楔头锤3
3
Harden the blade
Harden the blade
Grind a single bevel on the cutting blade, harden it in water and temper to a straw colour; leave the counter-blade softer.
此步骤所需材料：
水10 升所需工具：
铁匠炉
淬火水桶铁匠钳电焊手套安全眼镜4
4
Spring and catch
Spring and catch
Forge a V-shaped leaf spring from flat tool steel, leave it springy, and rivet its legs inside the handles. Bend a wire loop on one handle that hooks over the other to hold the shears closed.
此步骤所需材料：
工具钢扁钢1 个钢铆钉2 个
钢丝0.2 m所需工具：
铁匠炉横向楔头锤手摇钻
平口钳5
5
Sharpen
Sharpen
Hone the bevel only, never the flat face, and check the blades meet without a gap along the cut.
所需工具：
1000 目磨刀石6
6
Cutting force near the pivot
Cutting force near the pivot
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