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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.
Baguhan
Two days
Mga Tagubilin
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.
Mga materyales para sa hakbang na ito:
Taba ng baboy (taba sa bato at taba sa likod)7 kg
Tubig0.2 litroMga kailangang kasangkapan:
Set ng kutsilyo at pagproseso ng karne
Gilingan ng karne
Malaking kaldero
Pang-init na Plato
Telang muslin
Timbangang panimbang2
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.
Mga kailangang kasangkapan:
Termometro3
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.
Mga kailangang kasangkapan:
Telang linen
Pampigang keso4
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.
Mga kailangang kasangkapan:
Bote ng salaming ambar5
5
Oil in the lard
Oil in the lard
Naglo-load ng Jupyter notebook…
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.
Mga Materyales
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- 0.2 litroPlaceholder
Mga Kinakailangang Kasangkapan
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