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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.
Osezingeni eliphezulu
A day at the mill
Imiyalelo
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).
Izinto zokwakha zalesi sinyathelo:
Insimbi yembiza yokuncibilikisa2 kgAmathuluzi adingekayo:
Udlawu lomkhandi wensimbi
Amagilavu okushisela
Izibuko zokuphepha2
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.
Izinto zokwakha zalesi sinyathelo:
Amalahle5 as requiredAmathuluzi adingekayo:
Iziko lomkhandi wensimbi
Insimbi Yokukhandela
Isisiki esishisayo
Isando esikhuluUdlawu lomkhandi wensimbiAmagilavu okushiselaIzibuko zokuphepha3
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).
Izinto zokwakha zalesi sinyathelo:
Amalahle5 as requiredAmathuluzi adingekayo:
Umshini wokugingqa insimbiIziko lomkhandi wensimbiUdlawu lomkhandi wensimbiAmagilavu okushiselaIzibuko zokuphepha4
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.
Amathuluzi adingekayo:
Isikelo samapuletiAmagilavu okushiselaIzibuko zokuphepha5
5
Oldham's rule: how heavy an ingot
Oldham's rule: how heavy an ingot
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Amathuluzi Adingekayo
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