UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA

Needle File Set: Six Small Files Cut by Hand
Needle files are small files for fine work, where a good finish matters more than speed, sold in sets of shapes: pillar, half round, barrette, square, round and triangular. They are made like any file, only smaller and with finer teeth: forged, annealed, cut tooth by tooth with a chisel, and hardened in brine.
The picture: our diagram, six tapered needle files and their cross-sections.
Hejuru
Three days
Amabwiriza
1
1
Forge six blanks
Forge six blanks
Draw tool steel to six thin blanks, each with a tapered part for the teeth and a round handle part. Shape the sections in the swage block: pillar (narrow flat), half round, barrette, square, round and triangular.
Ibikoresho by'iyi ntambwe:
Inkoni ifite impande umunani y'icyuma cy'ibikoresho0.15 kg
Amakara2 as requiredIbikoresho bikenewe:
Uruganda rw'umucuzi
Ingoyi
Inyundo ifite umutwe utambitse
Igiti cy'ibyuma gifite imyobo
Amafashi y'umucuzi
Uturindantoki two gukomeza ibyuma
Amadarubindi y'umutekano2
2
Anneal and true
Anneal and true
Anneal the blanks: no hotter than blood red, cooled very slowly out of the air. Grind and file the faces true, or the teeth will not be even.
Ibikoresho bikenewe:
Uruganda rw'umucuzi
Ibuye ryo gutyaza ry'uruziga
Ikariso ry'Icyuma3
3
Cut the teeth
Cut the teeth
Raise fine teeth with the file-cutting chisel, one blow and a small even step at a time, under a loupe. Turn each blank on the pewter plate to cut the next face. On the barrette cut only the flat face; leave the other sides smooth (safe).
Ibikoresho bikenewe:
Icyuma gikata amenyo ya limes
Inyundo ifite umutwe utambitse
Ingoyi
Isahani ya pewutere
Lupu Yagura4
4
Harden, do not temper
Harden, do not temper
Heat each file evenly to its hardening heat and plunge it into cold brine. Then reheat the handle part alone so it is not glass-hard.
Ibikoresho by'iyi ntambwe:
Umunyu0.5 kg
Amazi5 litiroIbikoresho bikenewe:
Uruganda rw'umucuzi
Indobo
Amafashi y'umucuzi
Uturindantoki two gukomeza ibyuma
Amadarubindi y'umutekano5
5
Steel for a set of six
Steel for a set of six
Gupakira ikaye ya Jupyter…
Ibikoresho
4- Umwanya
- 2 as requiredUmwanya
- 0.5 kgUmwanya
- 5 litiroUmwanya
Ibikoresho bikenewe
13- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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CC0 Umurenge rusange
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