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UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
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UBUMENYI
SIPORO
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IBYAMBARWA

Fine-Tip Tweezers: One Steel Strip Bent and Spring-Tempered
Tweezers are two springy arms joined at one end: pressed, the tips close; let go, the spring opens them. They go back to predynastic Egypt. Make them from one strip of tool steel bent in half, temper it to a spring, and file the tips to fine needle points that meet exactly.
The picture: Roman tweezers, one strip bent at a loop, with a sliding ring.
Hagati
Half a day
Amabwiriza
1
1
Draw the strip
Draw the strip
Draw tool steel to a strip about 8 mm wide, 0.8 mm thick and 21 cm long (our size), tapering both ends.
Ibikoresho by'iyi ntambwe:
Inkoni iringaniye y'icyuma cy'ibikoresho1 igice
Amakara1 as requiredIbikoresho bikenewe:
Uruganda rw'umucuzi
Ingoyi
Inyundo ifite umutwe utambitse
Amafashi y'umucuzi2
2
Bend it in half
Bend it in half
Anneal, then bend the strip in half round a small rod so the arms spring apart with the tips about 6 mm open. Square the arms in the vise.
Ibikoresho bikenewe:
Ifatiro ry'Ameza
Inyundo ifite umutwe utambitse
Uruganda rw'umucuzi3
3
Shape the tips
Shape the tips
File the ends to long, fine points with the needle files, and dress the inner faces so the tips meet along the last few millimetres. Check under the loupe.
Ibikoresho bikenewe:
Ikusanyirizo ry'Amakariso Mato
Ikariso ry'Icyuma
Lupu Yagura4
4
Harden and spring-temper
Harden and spring-temper
Heat to cherry red and quench in oil, polish, then temper to blue so the arms spring back (our temper).
Ibikoresho bikenewe:
Uruganda rw'umucuzi
Indobo yo gukonjesha
Amavuta yo gukata
Amafashi y'umucuzi5
5
Finish the points
Finish the points
Hone the tips lightly on the stone and check that they close evenly without crossing.
Ibikoresho bikenewe:
Ibuye ryo gutyaza rya grit 1000
Lupu Yagura6
6
Closing force
Closing force
Gupakira ikaye ya Jupyter…
Ibikoresho bikenewe
11- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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