Ubufatanye
UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
English
Grindstone: Sandstone Wheel on a Cranked Axle with a Treadle
A grindstone is a sandstone wheel spun on its axle to sharpen metal tools, used wet. Medieval ones were turned by a crank; by about 1480 a treadle was added so one person could pedal and grind. Shape the stone, wedge it on an iron axle with a crank, and mount it over a water trough in a wooden frame with a treadle.
The picture: a treadle grindstone on an iron stand, from Cassell's Carpentry.
Hejuru
Several days
Amabwiriza
1
1
Shape the stone
Shape the stone
Scribe a circle on an even-grained sandstone slab, about 50 cm across and 7 cm thick (our size). Peck and chisel it round, then cut a square hole in the centre.
Ibikoresho by'iyi ntambwe:
Ikibaho cy'Ibuye ry'Umusenyi1 igiceIbikoresho bikenewe:
Ikizunguruka gifite imitwe ibiri
Ibuye ryo Gukubita
Ibikoresho by'Ibyuma byo Guca Amabuye
Inyundo y'igiti y'umubaji w'amabuye
Amadarubindi y'umutekano
Agapfukamunwa k'Umukungugu2
2
Forge the axle and crank
Forge the axle and crank
Forge a square-sectioned axle to pass through the hole, round at both ends for the bearings, and bend a crank at one end with a hole for the treadle rod.
Ibikoresho by'iyi ntambwe:
Umugozi w'icyuma cyacuzwe2 ibice
Amakara4 as requiredIbikoresho bikenewe:
Uruganda rw'umucuzi
Ingoyi
Inyundo ifite umutwe utambitse
Amafashi y'umucuzi3
3
Wedge and true the stone
Wedge and true the stone
Centre the stone on the axle and drive hardwood wedges round the square part from both sides until it runs without wobble. Turn it and dress the rim true against a fixed iron.
Ibikoresho by'iyi ntambwe:
Agace k'igiti gikomeye1 igiceIbikoresho bikenewe:
Inyundo y'igiti y'umubaji w'amabuyeIbikoresho by'Ibyuma byo Guca Amabuye4
4
Frame, trough and treadle
Frame, trough and treadle
Build an oak frame with notched bearings for the axle, a plank trough below the stone to hold water, and a treadle hinged at the back joined to the crank by a rod.
Ibikoresho by'iyi ntambwe:
Urubaho rw'ibiti bikomeye3 ibice
Imisumari y'Icyuma30 ibiceIbikoresho bikenewe:
Umucumita w'Intoki
Icyuma cyo kubaza umwobo w'ihuzo
Igikoresho cyo gutobora gikoreshwa n'intokiInyundo ifite umutwe utambitse5
5
Surface speed
Surface speed
Gupakira ikaye ya Jupyter…
Ibikoresho
6- 1 igiceUmwanya
- 2 ibiceUmwanya
- 4 as requiredUmwanya
- 1 igiceUmwanya
- 3 ibiceUmwanya
- 30 ibiceUmwanya
Ibikoresho bikenewe
13- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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