UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Claw Hammer: Drop-Forged Head, Turned Wooden Handle
A claw hammer's head is high-carbon steel, hot forged between dies and then hardened only where it takes the blows: the face, the poll and the claws. The handle is straight-grained ash or hickory, woods with good strength, durability and enough give to absorb the shock of repeated blows. It is turned on a lathe that copies a cam, pushed up through the head's eye and wedged: one thin wooden wedge driven diagonally into a slot, then two steel wedges driven through it crossways.
Hejuru
Factory process
Amabwiriza
1
1
Heat the bar
Heat the bar
Heat a length of steel bar to about 1,200–1,300 °C (2,200–2,350 °F) with open flame torches or by passing it through an induction coil.
Ibikoresho by'iyi ntambwe:
Inkoni ya kare y'icyuma cy'ibikoresho1 as requiredIbikoresho bikenewe:
Igishyushya hakoreshejwe induction2
2
Forge the head
Forge the head
Put the hot bar or a cut blank between the dies. The ram forces them together and squeezes the steel into the die cavities; repeat in several dies to form the head step by step.
Ibikoresho bikenewe:
Inyundo igwa ifite ibibumbiro byo gucura3
3
Trim the flash
Trim the flash
Cut off the flash, the steel squeezed out between the dies, with trimming dies. Cool the head and grind off rough spots.
Ibikoresho bikenewe:
Ibibumbiro bikata ibisigazwa
Imashini ihyeza yo ku meza4
4
Harden the face, poll and claws
Harden the face, poll and claws
Heat those areas with a flame or an induction coil and cool them quickly, so the steel near the surface becomes much harder than the rest of the head.
Ibikoresho bikenewe:
Igishyushya hakoreshejwe induction5
5
Clean and polish
Clean and polish
Shot blast the head (a stream of air carrying small steel particles), paint it if wanted, then polish the face, poll, claws and cheeks. Smooth the V-slot of the claws with an abrasive disc.
Ibikoresho bikenewe:
Akabati ko gutera utubuye tw'icyuma
Uruziga rusiga6
6
Turn the handle
Turn the handle
Cut ash or hickory to length and hold it at both ends in the lathe. As it spins, the cutting tool follows a cam with the handle's shape. Cut a slot diagonally across the top and sand the handle smooth.
Ibikoresho by'iyi ntambwe:
Igiti gikomeye cy'imikondo1 igiceIbikoresho bikenewe:
Imashini ibaza imihini iyoborwa na kame
Urupapuro rwo Gusya7
7
Hang the head
Hang the head
Push the handle up through the eye of the head. Tap the wooden wedge into the diagonal slot to spread the handle against the head, then drive two small steel wedges through it crossways.
Ibikoresho by'iyi ntambwe:
Igitsindo cy'ibiti bikomeye1 igice
Imbago z'icyuma zambukiranya2 ibiceIbikoresho
4- 1 as requiredUmwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
- 2 ibiceUmwanya
Ibikoresho bikenewe
8- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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