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Traditional Kurakkan Gala granite rotary quern mechanics: rotational shear velocity and bran milling?

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K
Klaus Quern•910 rep

How do rural households dress radial shearing grooves onto two-piece granite grinding stones (Kurakkan Gala) to mill Eleusine coracana grain into grit-free flour?

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5 Answers from travellers

✓Accepted Answer

The traditional Sri Lankan rotary quern (Kurakkan Gala) is an ancient stone milling tool engineered specifically for grinding tiny, tough seeds of finger millet (Kurakkan). It comprises two circular dressed granite slabs: a stationary lower stone with a central upright iron pivot (Kula) and a rotating upper stone with an offset wooden handle (Edanda). Stonemasons chisel radial grooves (teeth / Keta) into both matching faces using hardened steel points. As the upper stone rotates at 40-50 RPM, grain fed into the central eye is sheared progressively outward between the grooves, pulverizing the hard fibrous seed coat into flour without frictional overheating.

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G
Guru Dharmasena Wood•1830 rep

The grooves must be re-dressed (picked) with a pointed cold chisel every six months; worn smooth stones crush grain into coarse flakes rather than fine flour.

21
K
Klaus Quern•910 rep

Cold hand-stone milling preserves heat-sensitive Vitamin E and essential dietary fiber that decompose in modern high-speed steel hammer mills.

18
V
Vaidya Harsha Arishta•1770 rep

A wide woven palmyrah or cane mat (Kulla) is spread beneath the stone quern to collect flour as it spills radially from the perimeter gap.

15
M
Mia Macrobrachium•910 rep

Milled Kurakkan flour is sieved through fine brass cloth to separate residual fibrous outer husk fragments before preparing traditional Roti and Pittu.

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D
Dr Dayaratne Spices•1820 rep

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