UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Forged Cross-Peen Hammer
Smiths make their own hammers. A bar of high-carbon steel is punched through hot for the eye, the eye is opened to shape with a drift, one end is drawn into a peen, and the head is cut off the bar. It is hardened all over, then tempered by heat run from the middle: the eye and cheeks are left soft (blue) so they do not crack, the faces harder (straw) so they do not dent. The handle is riven ash or hickory, wedged into the eye.
Hejuru
A day
Amabwiriza
1
1
Square the bar
Square the bar
Forge crucible steel into a square bar about 30 mm across, long enough to hold by one end.
Ibikoresho by'iyi ntambwe:
Icyuma gikomeye cy'isahani y'ishongesha2 kg
Amakara15 kgIbikoresho bikenewe:
Uruganda rw'umucuzi
Ingoyi
Inyundo nini
Amafashi y'umucuzi
Ikanzu y'uruhu
Uturindantoki two gukomeza ibyuma
Amadarubindi y'umutekano
Ibipfukamatwi birinda2
2
Punch the eye
Punch the eye
At a yellow heat, drive the hot punch halfway in from one side, turn the bar over and punch through from the other side over the anvil's hole. Cool the punch often.
Ibikoresho by'iyi ntambwe:
Amazi5 litiroIbikoresho bikenewe:
Igitobora gishyushyeInyundo niniIngoyi
Indobo yo gukonjesha3
3
Drift the eye
Drift the eye
Drive the drift through the hot eye from both sides to open it to the handle's shape.
Ibikoresho bikenewe:
Igikoresho cy'umucuzi cyagura umwoboInyundo nini4
4
Draw the peen
Draw the peen
Mark the head's length. Draw one side of the eye into a wedge-shaped peen with the fuller and flatter, its edge across the handle's line.
Ibikoresho bikenewe:
Fuller (icyuma cyo gucukura imirongo)
Igikoresho cy'umucuzi cyo kuringanizaInyundo nini5
5
Cut off and dress
Cut off and dress
Cut the head off the bar on the hot-cut hardy. Square and slightly dome the face; round the peen's edge.
Ibikoresho bikenewe:
Icyuma gikata ku ngoyiInyundo nini
Amakariso Menshi6
6
Normalise
Normalise
Heat it to a red heat and let it cool in still air, three times, to relieve the forging.
Ibikoresho bikenewe:
Uruganda rw'umucuziAmafashi y'umucuzi7
7
Harden
Harden
Heat evenly until a magnet no longer sticks, and quench it in warm oil in a lidded bucket, moving it, for a few minutes.
Ibikoresho by'iyi ntambwe:
Amavuta ya kolza5 litiroIbikoresho bikenewe:
Uruganda rw'umucuzi
Rukuruzi
Indobo y'icyuma ifite umufunikoAmafashi y'umucuziUturindantoki two gukomeza ibyuma8
8
Temper from the eye
Temper from the eye
Sand the faces bright. Heat the middle of the head with the torch and watch the colours run out toward the ends: when the faces reach straw and the eye is blue, quench it in water.
Ibikoresho bikenewe:
Urupapuro rwo kunoza
Itara rya PropaneIndobo yo gukonjeshaAmafashi y'umucuzi9
9
Handle
Handle
Shave the handle stock to fit the eye tightly, drive the head on, saw a kerf in the handle's top and drive a glued hardwood wedge into it. Trim flush and oil the handle.
Ibikoresho by'iyi ntambwe:
Igiti gikomeye cy'imikondo1 igice
Igitsindo cy'ibiti bikomeye1 igice
Amavuta y'Ubudodo10 mlIbikoresho bikenewe:
Ikirwanya gifite imifatiro ibiri
Umusumeno w'abantu babiri
Ifatiro ry'Ameza10
10
Troubleshooting
Troubleshooting
Hammer making troubleshooting.
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Ibikoresho
7- Umwanya
- 15 kgUmwanya
- 5 litiroUmwanya
- 5 litiroUmwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
- 10 mlUmwanya
Ibikoresho bikenewe
22- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
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