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Saw Plate Steel Rolled from a Crucible Ingot
Saw blades start as thin steel plate. In the 1880s Disston's works cast crucible steel into flat ingots, cut each ingot into pieces, rolled every piece to the gauge of the saw and sheared it to outline; one handsaw plate was split diagonally to make two tapered blades (Grimshaw, Saws, 1882).
The picture: our diagram, ingot to rolls to plate, with the diagonal split.
高级
A day at the mill
说明
1
1
A flat ingot
A flat ingot
Start from crucible steel cast in an iron mould as a flat block. Grimshaw's ingot for 18 handsaws of 26 in weighed 48 lb and measured 6.5 × 12 × 2 in. For thicker saws, use milder steel (less carbon).
此步骤所需材料：
坩埚钢2 公斤所需工具：
铁匠钳
电焊手套
安全眼镜2
2
Cut the ingot
Cut the ingot
Heat the ingot and cut it into equal pieces, one per plate, using Oldham's rule (step 5) for the weight each plate needs.
此步骤所需材料：
木炭5 as required所需工具：
铁匠炉
铁砧
热錾
大锤铁匠钳电焊手套安全眼镜3
3
Roll to gauge
Roll to gauge
Pass each hot piece through the rolls again and again, reheating as needed, until it reaches the plate size. Between passes slap the plate on a smooth iron floor to knock off scale, which would otherwise be rolled into the steel (Grimshaw).
此步骤所需材料：
木炭5 as required所需工具：
轧机铁匠炉铁匠钳电焊手套安全眼镜4
4
Shear to outline
Shear to outline
Shear the plate to the outline of the saw. For handsaws, split the plate diagonally along its length to get two tapered blades.
所需工具：
板材剪电焊手套安全眼镜5
5
Oldham's rule: how heavy an ingot
Oldham's rule: how heavy an ingot
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