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Cutting Oil: Lard Oil Pressed Out of Lard

No machine-readable author provided. Peter G Werner~commonswiki assumed (based on copyright claims). (Wikimedia Commons) · CC BY 2.5

أنشأه

Forge

14. أكتوبر 2026

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.

مبتدئ

Two days

التعليمات

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.

المواد لهذه الخطوة:

دهن الخنزير (دهن الكلى ودهن الظهر)7 كغ

ماء0.2 لتر

الأدوات المطلوبة:

طقم سكاكين جزارة وتجهيز اللحم

مفرمة لحم

قدر كبير

صفيحة تسخين

قماش موسلين

ميزان ذو كفّتين

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.

الأدوات المطلوبة:

ميزان حرارة

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.

الأدوات المطلوبة:

قماش كتّان

مكبس الجبن

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.

الأدوات المطلوبة:

زجاجة زجاج عنبري

Oil in the lard

جارٍ تحميل دفتر Jupyter…

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.