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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.
初学者
Two days
说明
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.
此步骤所需材料：
猪脂（板油和背膘）7 公斤
水0.2 升所需工具：
屠宰刀与分割套装
绞肉机
大汤锅
电热板
平纹细布
等臂天平2
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.
所需工具：
温度计3
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.
所需工具：
亚麻布
干酪压榨器4
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.
所需工具：
琥珀色玻璃瓶5
5
Oil in the lard
Oil in the lard
正在加载 Jupyter 笔记本…
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.
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