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Trapped-Air Cylinder Dash Churn: A Hollow Dash That Squeezes Air Into the Cream
Charles Murdock, Baltimore, Maryland · Public domain (expired patent)
Emma

Erstellt von

Emma

6. Oktober 2026SE
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Trapped-Air Cylinder Dash Churn: A Hollow Dash That Squeezes Air Into the Cream

Murdock wanted the air carried down through the cream by the common up-and-down dash itself. Charles Murdock of Baltimore, Maryland, received US 6,133, dated 20 February 1849, for "Murdock's Atmospheric Churn": a hollow cylindrical dash, perforated round its lower open end, on the common dash staff, which is bored to slide over a fixed central spindle. The spindle stands in a stationary cylindrical block, smaller than the dash, held to the churn's bottom by a nut. At each stroke the dash fills with air above the cream, carries it down, and when it meets the block the air "is compressed in the cylinder forced radially through the apertures." This rung works out the air squeezed out each stroke, then prints the dash and block, fits them to a churn, and makes butter.
Anfänger
About 2 hours, plus printing

Anweisungen

1

Air per stroke

Jupyter-Notebook wird geladen …
2

An air pump in the churn before it

The embedded blueprint puts a pump and a ring dasher in the churn. Murdock makes the dash itself the pump.
3

Read US 6,133

"The air, however, may be let into the cylinder through a valve in its top or side instead of open end which will do away with the necessity of raising the cylinder above the surface of the cream to receive air. The aperture in the staff must be a little larger than the spindle but must not extend through it nor be intersected by any lateral opening."
4

Print the dash and block

Print the dash open end up: a 90 mm cylinder with sixteen small holes near its open edge and a socket for the staff. Print the block. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Materialien für diesen Schritt:

PETG-FilamentPETG-Filament1 Stück

Benötigte Werkzeuge:

FDM-3D-DruckerFDM-3D-Drucker
5

Print the dash

The dash, printed as step 4 describes.
DesigndateiSTLCC0 - Free
Modell herunterladen
6

Print the block

The block, printed as step 4 describes.
DesigndateiSTLCC0 - Free
Modell herunterladen
7

Spindle and block

Drill an 8 mm hole in the centre of a tall food-grade bucket's floor. Pass an M8 threaded rod up through it and the block, with a washer and nut under the floor and silicone round the hole, so the rod stands upright as the spindle.

Materialien für diesen Schritt:

20-Liter-Eimer20-Liter-Eimer1 Stück
GewindestangeGewindestange1 Stück
SechskantmutterSechskantmutter1 Stück
UnterlegscheibeUnterlegscheibe1 Stück
SilikondichtmasseSilikondichtmasse1 Stück

Benötigte Werkzeuge:

AkkubohrschrauberAkkubohrschrauber
BohrersatzBohrersatz
RollgabelschlüsselRollgabelschlüssel
Bügelsäge (Metallsäge)Bügelsäge (Metallsäge)
8

Staff and lid

Bore a 25 mm hardwood dowel lengthwise, 10 mm, deep enough to slide over the spindle's full height but not through its top, and glue the dash on its foot. Drill the lid for the staff and fit a knob on top.

Materialien für diesen Schritt:

HartholzdübelHartholzdübel1 Stück
HartholzblockHartholzblock1 Stück
HolzleimHolzleim1 Stück

Benötigte Werkzeuge:

AkkubohrschrauberAkkubohrschrauber
BohrersatzBohrersatz
HandsägeHandsäge
SchleifpapierSchleifpapier
9

The build in 3D

FreeCAD model of this build, not of the patent: the churn and dash cut away to show the hollow dash with its holes near the open end, the bored staff over the fixed spindle, and the stationary block it closes over.
DesigndateiBLENDCC0 - Free
Modell herunterladen
10

Dash and make butter

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 1.5 litres. Work the staff up and down, lifting the dash above the cream each time to fill it with air; bubbles burst from the holes at the foot of each 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.
Schritt 10 - Image 1

Materialien für diesen Schritt:

SchlagsahneSchlagsahne1500 ml
Grobes MeersalzGrobes Meersalz1 Stück
WasserWasser1 Stück

Benötigte Werkzeuge:

Einsteck-FühlerthermometerEinsteck-Fühlerthermometer
StoppuhrStoppuhr
Digitale KüchenwaageDigitale Küchenwaage
Große Rührschüssel aus EdelstahlGroße Rührschüssel aus Edelstahl
11

No bubbles, a staff that sticks

Trapped-air cylinder dash churn troubleshooting.

Flow

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12

History and honest limits

**Charles Murdock** of Baltimore, Maryland, received US 6,133, dated 20 February 1849, signed 21 November 1848. The dash could be formed in the underside of the dash block, or as a cylinder fixed to the dash's periphery; in a stone churn the spindle's hole could be drilled and bushed. He claimed the combination of the hollow perforated cylinder dash and the central guide spindle and stationary block with the ordinary upright tub churn. **Honest limits.** A bucket, threaded rod and printed parts stand in for his churn, spindle and dash. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.

Materialien

12

Benötigte Werkzeuge

11

Designdateien

3

Dieser Bauplan stellt her

Thumbnail
Platzhalter

Butterfass

Free

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CC0 Gemeinfrei

Dieser Blueprint ist unter CC0 veröffentlicht. Sie dürfen dieses Werk für jeden Zweck frei kopieren, ändern, verbreiten und verwenden, ohne um Erlaubnis zu fragen.

Unterstützen Sie den Maker, indem Sie Produkte über seinen Blueprint kaufen, wo er eine Maker-Provision von Anbietern festgelegt, verdient. Oder erstellen Sie eine neue Iteration dieses Blueprints und verbinden Sie ihn in Ihrem eigenen Blueprint, um Einnahmen zu teilen.

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