A barrel churn is a 5-10 gallon barrel mounted horizontally on a frame with a crank and internal paddles, filled only one-third to one-half with cream at 55-60°F and cranked steadily for 20-45 minutes. Fill it to that level because the cream whips up and needs room, and hold the temperature in that band because cream that is too cold will not come together and cream that is too warm gives soft, greasy butter.
Part of Dairy Production at Scale
Barrel churning scales hand butter-making by agitating cream in a rotating, sealed barrel until the fat clumps, then draining the buttermilk and washing the butter.
A Barrel Replaces Wrists With A Crank And Fills To A Fraction
At household scale a paddle or a jar works; the parent article says hand-held paddles are too slow at community scale. A barrel churn takes a batch of several gallons and is turned by crank, with paddles inside that fold the cream over as the barrel rotates.
What You Need
- A clean barrel of 5-10 gallons, food-safe and scalded before use, with a tight bung or lid
- A frame that holds the barrel horizontally on an axle, and a crank
- Internal paddles fixed to the barrel
- A thermometer for the cream, a drain tap or a bung hole, and cold clean water for washing
- Two people, so the crank can be turned in shifts
Method: Churning A Batch
Step 1: Bring the cream to 55-60°F. Cream is churned from pasteurized milk (see Pasteurization Methods). Warm the cream in a pan of warm water or chill it in cold water until the thermometer reads 55-60°F, which is the same range Dairy Processing gives as 12-15°C. Ripening the cream first, as in Cultured Butter, adds flavor.
Step 2: Fill the barrel one-third to one-half. Never more. The cream expands as it whips before it breaks, and it needs the empty space.
Step 3: Crank steadily for 20-45 minutes. The contents go through stages that you can hear and feel: thick whipped cream that slaps against the end; granular butter, called breaking, when the sound changes and small grains appear; butter clumps floating in thin buttermilk. Stop when the grains are about the size of rice. Continuing turns them into one large lump that traps buttermilk.
Step 4: Drain the buttermilk. Save it, since it is good for cooking, baking and drinking.
Step 5: Wash. Knead the butter in cold water 3-4 times until the water runs clear, as the parent article specifies. Buttermilk left in the butter is what spoils it.
Step 6: Salt and pack. See Salting and storage.
Worked Example: One Barrel Batch
A 10-gallon barrel filled one-third to one-half holds 3.3-5 gallons of cream. Taking 4 gallons as the middle case:
- 4 gal × 3.785 L/gal = 15.1 L of cream.
- The Dairy Processing table gives butter at about 40% of the cream’s volume, so 15.1 × 0.40 = 6.0 L of butter.
- At butter’s density of about 0.91 kg per liter (a standard value from memory), 6.0 L is about 5.5 kg.
- Cross-check by fat: cream at 35% fat is about 15 kg for 15.1 L, holding 5.3 kg of fat; butter is about 80% fat (a standard figure from memory), so 5.3 ÷ 0.80 = 6.6 kg if every gram were captured. Real butter is lower, because some fat stays in the buttermilk, so 5.5-6 kg is consistent.
- The milk behind it depends on how thick the cream is: 4 gallons of 35% cream is about 11% of the milk’s volume (see Cream Separation Techniques), so roughly 35 gallons of milk.
Hand-cranking a batch is within a person’s ability for a short time, so two people alternate. If you drive the barrel from a wheel or a treadle, put a speed reduction between the source and the churn; see Speed Reduction.
Common Mistakes
- Overfilling the barrel. The cream cannot whip and will not break.
- Wrong temperature. Cold cream churns slowly for an hour or more without breaking; warm cream gives greasy butter. Adjust with a water bath and try again.
- Churning past the grain stage. Buttermilk trapped in one lump of butter cannot be washed out.
- Unwashed barrel between batches. Residues sour within hours.
Safety
A loaded barrel is heavy and it can turn the crank back against you
A barrel with several gallons of cream is well over 20 kg and sloshing cream makes it swing unevenly. If you let go of the crank, the weight can spin the handle back into your hand or wrist. Fit a pawl or ratchet that holds the barrel, mount the frame on a flat base that cannot tip, and keep fingers away from the paddles and axle when the barrel is moving.
What’s Next
- Learn next: Salting and storage — how long the butter keeps
- Combine with: Cream Separation Techniques — what goes into the barrel