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UBUKORIKORI
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IBYAMBARWA
Wood Chisels and Gouges Forged from Tool Steel
A woodworking chisel is a flat steel blade with a bevelled edge, hardened and tempered, on a wooden handle; bevelled sides let it into tight corners. A gouge is the same with a blade curved in section, for hollowing. Forge a set of widths from tool steel, harden them, temper to a dark straw and hone them sharp.
The picture: a bevel-edge wood chisel with its ferrule and wooden handle.
Hejuru
A day for a set
Amabwiriza
1
1
Forge the blades
Forge the blades
Draw tool-steel bar out flat to each blade width, taper it slightly toward the edge and forge a square tang on the other end. For gouges, set the hot blade over a round groove of the swage block and drive it in to curve it.
Ibikoresho by'iyi ntambwe:
Inkoni iringaniye y'icyuma cy'ibikoresho1 igice
Amakara1 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
File and bevel
File and bevel
Anneal by cooling slowly in the ashes, then file the faces flat, file the side bevels, and file the edge bevel, leaving it a little thick.
Ibikoresho bikenewe:
Ikariso ry'Icyuma3
3
Harden and temper
Harden and temper
Heat the blade evenly to a cherry red and quench it in water. Polish it bright, then heat the back gently and quench again as soon as a dark straw colour reaches the edge.
Ibikoresho by'iyi ntambwe:
Amazi10 litiroIbikoresho bikenewe:
Uruganda rw'umucuzi
Indobo yo gukonjeshaAmafashi y'umucuziUturindantoki two gukomeza ibyumaAmadarubindi y'umutekano4
4
Handles
Handles
Turn hardwood handles, fit a brass ferrule at the front of each, drill a pilot hole and drive the tang in. Oil the handles.
Ibikoresho by'iyi ntambwe:
Agace k'igiti gikomeye2 ibice
Urupapuro rw'Umuringa w'Umuhondo1 igice
Amavuta y'Ubudodo0.05 litiroIbikoresho bikenewe:
Imashini ikerekeza ibiti
Igikoresho cyo gutobora gikoreshwa n'intoki5
5
Hone
Hone
Flatten each back on the stone and hone the bevel until a fine burr forms, then remove it.
Ibikoresho bikenewe:
Ibuye ryo gutyaza rya grit 10006
6
Temper colours
Temper colours
Gupakira ikaye ya Jupyter…
Ibikoresho
6- Umwanya
- 1 as requiredUmwanya
- 10 litiroUmwanya
- 2 ibiceUmwanya
- Umwanya
- 0.05 litiroUmwanya
Ibikoresho bikenewe
12- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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