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Valved Hollow-Staff Plunger Churn: A Valve at the Top, Air Forced Out at the Foot
TheChef

Creado por

TheChef

6. octubre 2026DK
37
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Valved Hollow-Staff Plunger Churn: A Valve at the Top, Air Forced Out at the Foot

Ellicott's dasher draws its air down through its own handle. Peter F. Ellicott of Philadelphia, Pennsylvania, received US 7,454, dated 25 June 1850, for an atmospheric churn: "in any ordinary vertical churn," an upright hollow staff connected at the bottom to a square or round hollow plunger open below, with air holes in its sides "1/2 inch in diameter," and a valve inside the staff at its top "so arranged that when the said staff and plunger are raised, the valve will open," and when forced down "the valve will close, and the atmospheric air in the plunger will be forced through the body of the milk or cream." This rung works out the air per stroke, then prints the plunger and valve cap, fits them to a hollow staff, and makes butter.
Principiante
About 1 hour, plus printing

Instrucciones

1

Air per stroke

Cargando el cuaderno de Jupyter…
2

A hand dasher that pumps air before it

The embedded blueprint pumps air with a tube over a loose plunger. Ellicott's air comes down a hollow staff through a valve at its top.
3

Read US 7,454

"C, Fig. 1 is a square or round dasher or plunger being hollow and open at the lower end with air holes, in the sides, 1/2 inch in diameter, and knobs outside. D, Fig. 2 is a full size section of valve placed on the top of the staff B, Fig. 1."
4

Print the parts

Print the hollow plunger open end down, with its twelve side holes and a socket for the staff, and the valve cap. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Materiales para este paso:

Filamento PETGFilamento PETG1 pieza

Herramientas necesarias:

Impresora 3D de filamento (FDM)Impresora 3D de filamento (FDM)
5

Print the plunger

The plunger, printed as step 4 describes.
Archivo de DisenoSTLCC0 - Free
6

Print the valve cap

The valve cap, printed as step 4 describes.
Archivo de DisenoSTLCC0 - Free
7

Staff and valve

Cut a length of 12–13 mm food-grade tube as the hollow staff, as long as the churn is deep plus 150 mm, and glue it into the plunger's socket. Glue a small leather flap inside the valve cap over its port, hinged on the cap's pin, so it lifts to let air in as the staff rises and seats as it falls; glue the cap on the staff's top.

Materiales para este paso:

Tubo de PVCTubo de PVC1 pieza
Tira de cueroTira de cuero1 pieza
Epoxi de dos componentesEpoxi de dos componentes1 pieza

Herramientas necesarias:

Sierra para metalesSierra para metales
Papel de lijaPapel de lija
8

The churn

Drill a food-grade bucket's lid at the centre for the staff, a little larger than it.

Materiales para este paso:

Cubo de 20 litrosCubo de 20 litros1 pieza

Herramientas necesarias:

Taladro inalámbricoTaladro inalámbrico
Juego de coronas perforadorasJuego de coronas perforadoras
9

The build in 3D

FreeCAD model of this build, not of the patent: the churn cut away to show the hollow plunger with its side holes, the hollow staff through the lid and the valve cap on top.
Archivo de DisenoBLENDCC0 - Free
10

Dash and make butter

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 2 litres. Work the staff up and down; bubbles should burst from the plunger's holes on each down-stroke. Time until the butter comes. Pour off the buttermilk, add cold water, churn a little and pour off again until it runs clear; work in a pinch of salt and weigh the butter.
Paso 10 - Image 1

Materiales para este paso:

Crema de leche espesaCrema de leche espesa2000 ml
Sal marina gruesaSal marina gruesa1 pieza
AguaAgua1 pieza

Herramientas necesarias:

Termómetro de sonda permanenteTermómetro de sonda permanente
CronómetroCronómetro
Báscula digital de cocinaBáscula digital de cocina
Bol grande de acero inoxidableBol grande de acero inoxidable
11

No bubbles, cream up the staff

Valved hollow-staff plunger churn troubleshooting.

Flow

Loading...
12

History and honest limits

**Peter F. Ellicott** of Philadelphia, Pennsylvania, received US 7,454, dated 25 June 1850. His drawing shows the plunger with knobs outside and a full-size section of the valve. He claimed "a hollow staff connected with a square or round hollow plunger, with a valve placed at the top, or at any point inside of said staff," to be used in any vessel containing milk or cream. **Honest limits.** Food-grade tube and printed parts stand in for his staff, plunger and valve; our holes are smaller than his half inch. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.

Materiales

8

Herramientas requeridas

9

Archivos de diseño

3

CC0 Dominio público

Este Blueprint se publica bajo CC0. Eres libre de copiar, modificar, distribuir y usar este trabajo para cualquier propósito, sin pedir permiso.

Apoya al Maker comprando productos a través de su Blueprint, donde gana una Comisión del Maker establecida por los vendedores, o crea una nueva iteración de este Blueprint e inclúyela como conexión en tu propio Blueprint para compartir ingresos.

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