IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀

Scissors: Forged, Ground Hollow and Set
As the Sheffield cutlery trade made them, each scissor blade and its bow (finger loop) is forged from steel: a hole is punched through the flattened rod and opened over the point of a small beaked anvil to form the bow. Die-forging under a heavy stamp, with the surplus rim sheared off in a fly-press, was replacing hand forging by 1913. The blades are annealed, filed and drilled for the rivet, then ground: each is hollow on its inner face, concave from rivet to point, and given a slight twist toward the other so the edges meet along their whole length. The pair is fitted, wound with iron wire, hardened, reground and polished, and finally riveted together and set.
Ilọsíwájú
Works process (early 1900s)
Ìlànà
1
1
Forge the blades
Forge the blades
Forge each blade and shank; punch a hole through the flattened rod and open it over the beaked anvil to form the bow.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ọ̀pá pẹlẹbẹ irin irinṣẹ́1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Ìléru alágbẹ̀dẹ
Ìdí Alágbẹ̀dẹ
Ìdí alágbẹ̀dẹ kékeré oníkàbà
Òòlù Alágbẹ̀dẹ2
2
Anneal, file and drill
Anneal, file and drill
Anneal the blades instead of hardening them; file the shanks and bows to shape, square the joint and bore the rivet hole.
Àwọn irinṣẹ́ tí a nílò:
Ìfá Irin
Ẹ̀rọ Ìlùkòkò Onídúró3
3
Grind
Grind
Grind each blade hollow from back to edge, concave from rivet to point, with a slight twist toward its partner.
Àwọn irinṣẹ́ tí a nílò:
Òkúta ìfá oníkẹ̀kẹ́4
4
Fit and harden
Fit and harden
Fit the pair, wind them from the points upward with iron wire, take out the rivet and harden the blades.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Okun waya irin0.5 mÀwọn irinṣẹ́ tí a nílò:
Ìléru alágbẹ̀dẹ
Àpótí ìtutù5
5
Finish and set
Finish and set
Grind, glaze and polish the bows and shanks again and burnish them; rivet the blades together and set them so the edges meet along their length.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ìṣó irin1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Òkúta ìfá oníkẹ̀kẹ́
Kẹ̀kẹ́ ìdán emeryÀwọn ohun-èlò
3- Àyè
- 0.5 mÀyè
- 1 ẹyọÀyè
Àwọn irinṣẹ́ tó nílò
9- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
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