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Double-Concave Perforated Disk Dasher: Two Tin Domes With Half-Covered Holes
YourGrandma

Erstellt von

YourGrandma

6. Oktober 2026IS
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Double-Concave Perforated Disk Dasher: Two Tin Domes With Half-Covered Holes

Marsh improved the dasher of "the plain old-fashioned churns so long used by farmers generally." Joseph Marsh of Petersburg, Menard County, Illinois, received US 7,527, dated 30 July 1850, for a "double-concave perforated discoid churn-dasher": two convex pieces of tin or other suitable material, "perforated and placed on the upright," about six inches across with holes about three-quarters of an inch, "the several holes in B made to cover about half of the several holes in C." It works in a straight-sided churn by raising and pushing it, or by a lever. This rung works out the open area, then prints the two domes and spacer, fits them to a staff, and makes butter.
Anfänger
About 1 hour, plus printing

Anweisungen

1

Half-covered holes

Jupyter-Notebook wird geladen …
2

An improved common dasher before it

The embedded blueprint improves the common dasher with pitched oars. Marsh uses two perforated domes whose holes half overlap.
3

Read US 7,527

"The convex pieces of tin, as shown at B and C, are or may be six inches in diameter, and the several holes in the same about three-quarters of an inch in diameter, the several holes in B made to cover about half of the several holes in C."
4

Print the domes

Print the two domes: 152 mm across with 19 mm holes, the second turned so its holes half cover the first's. Print the spacer ring. 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 first dome

The first dome, printed as step 4 describes.
DesigndateiSTLCC0 - Free
6

Print the second dome

The second dome, printed as step 4 describes.
DesigndateiSTLCC0 - Free
7

Print the spacer ring

The spacer ring, printed as step 4 describes.
DesigndateiSTLCC0 - Free
8

Assemble

Glue the two domes back to back on the spacer ring, convex sides out, holes half overlapping, and glue them on the foot of a 12 mm hardwood dowel staff.

Materialien für diesen Schritt:

HartholzdübelHartholzdübel1 Stück
ZweikomponentenepoxidZweikomponentenepoxid1 Stück

Benötigte Werkzeuge:

HandsägeHandsäge
SchleifpapierSchleifpapier
9

The churn

Use a straight-sided food-grade container about 160 mm across and 300 mm tall, so the dasher fits closely without rubbing, as he said. Drill its lid for the staff.

Materialien für diesen Schritt:

Vorratsbehälter in LebensmittelqualitätVorratsbehälter in Lebensmittelqualität1 Stück

Benötigte Werkzeuge:

AkkubohrschrauberAkkubohrschrauber
Lochsägen-SetLochsägen-Set
10

The build in 3D

FreeCAD model of this build, not of the patent: the straight-sided churn cut away to show the two perforated domes back to back on the staff, and a lever.
DesigndateiBLENDCC0 - Free
11

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; 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 11 - Image 1

Materialien für diesen Schritt:

SchlagsahneSchlagsahne2000 ml
Grobes MeersalzGrobes Meersalz1 Stück
WasserWasser1 Stück

Benötigte Werkzeuge:

Einsteck-FühlerthermometerEinsteck-Fühlerthermometer
StoppuhrStoppuhr
Digitale KüchenwaageDigitale Küchenwaage
Große Rührschüssel aus EdelstahlGroße Rührschüssel aus Edelstahl
12

A dasher that sticks or splashes

Double-concave disk dasher troubleshooting.

Flow

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13

History and honest limits

**Joseph Marsh** of Petersburg, Menard County, Illinois, received US 7,527, dated 30 July 1850. He wrote that it creates "a suction of atmosphere through the milk ... that excels any improvement in churns of ancient or modern invention"; that is his claim. His churn was straight inside "instead of cone-shaped." He claimed the double-concave perforated discoid churn-dasher. **Honest limits.** Printed domes stand in for his tin. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.

Materialien

7

Benötigte Werkzeuge

9

Designdateien

4

Dieser Bauplan stellt her

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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