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UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
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IBYAMBARWA
Cutting Oil: Lard Oil Pressed Out of Lard
Before mineral oils, machinists cut, drilled and tapped metal with animal fats, lard above all. Lard is part liquid oil (oleine) and part solid fat (stearine); chill it and squeeze it in linen bags and the oil runs out, as Andrew Ure (1839) describes. That lard oil is the cutting oil.
The picture: a cake of home-rendered lard, the starting point.
Utangiye
Two days
Amabwiriza
1
1
Cut and render the fat
Cut and render the fat
Cut or grind the pig fat small, melt it slowly in a pot with a splash of water, without browning, and strain the clear liquid lard through muslin.
Ibikoresho by'iyi ntambwe:
Ibinure by'ingurube (byo ku mpyiko no mu mugongo)7 kg
Amazi0.2 litiroIbikoresho bikenewe:
Agatsiko k'ibyuma byo kubaga no gutunganya inyama
Imashini yo gusya inyama
Inkono nini
Urubaho rushyushya
Umwenda wa musulini
Umunzani w'ibiro2
2
Let it grain cold
Let it grain cold
Let the lard set and stand somewhere cool, around 10 °C (our choice), for a day so the solid part grains out.
Ibikoresho bikenewe:
Igipima Ubushyuhe3
3
Press in linen bags
Press in linen bags
Spoon the cold, grainy lard into linen bags and press them slowly. The clear oil runs off; the hard white stearine stays in the bags.
Ibikoresho bikenewe:
Umwenda wa lino
Imashini ikanda ifomaje4
4
Settle and bottle
Settle and bottle
Let the oil settle, pour it off clear and bottle it. Brush or drip it onto the work when cutting, drilling or tapping.
Ibikoresho bikenewe:
Icupa ry'ikirahure cy'umuhondo5
5
Oil in the lard
Oil in the lard
Gupakira ikaye ya Jupyter…
6
6
Limits
Limits
Lard's make-up and the pressing are Ure's; lard as a cutting fluid is from Wikipedia. The rendering, the pressing temperature and the recovery are ours. Lard oil goes rancid with time: make small batches.
Ibikoresho bikenewe
10- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
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