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Double-Acting Swing Dash Churn: Two Dasher Strokes From Every Swing
Martin

Criado por

Martin

6. outubro 2026NO
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Double-Acting Swing Dash Churn: Two Dasher Strokes From Every Swing

The Davises doubled the work a swinging churn gets from each swing. William F. Davis and Nathan Davis of Castleton, Vermont, received US 9,416, dated 23 November 1852, for "The Oscillating Double-Acting Dash-Churn": a tank hung in a pendulum frame between standards three and a half feet long; a connecting board pinned to one pendulum bar, slotted to slide on the rock shaft, carrying two pins that enter two opposite notches in a wheel fixed to the rock shaft; and a lever from the rock shaft to a hollow dash stick with a valve "for the purpose of preventing a vacuum underneath the dash." This rung works out the strokes, then prints the notched wheel and connecting board, builds the frame and swing, and makes butter.
Avançado
About 6 hours, plus printing

Instruções

1

Strokes per minute

A carregar o notebook Jupyter…
2

The swing churn it doubles

The embedded blueprint gives one dasher stroke per swing through a bent lever. The Davises' notched wheel and two-pinned board give two.
3

Read US 9,416

"As the swing moves from the center toward the left and back the upper pin leaves the upper notch and the lower pin enters its respective notch, producing substantially the same result as when the upper pin entered the upper notch and passed toward the right and back. Thus we produce two complete motions of the dash from one full oscillation of the pendulum bars."
4

Print the parts

Print the notched wheel (/uploads/blueprints/double-acting-swing-dash-churn-notched-wheel.stl) and the connecting board with its slot and two pins (/uploads/blueprints/double-acting-swing-dash-churn-connecting-board.stl). Reuse the dasher and valve plug from the pendulum swing dash churn if you have them. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Materiais para este passo:

Filamento PETGFilamento PETG1 peça

Ferramentas necessárias:

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

Frame and swing

Build two pine A-frames about 520 mm tall joined at the top, with diagonal cross pieces carrying the rock shaft, and hang a swing of two pine bars and a plywood board from a rod at the top. Stand a straight-sided food-grade container on the board as the tank.

Materiais para este passo:

Tábua de pinhoTábua de pinho1 peça
Placa de contraplacadoPlaca de contraplacado1 peça
Varão de aço macioVarão de aço macio1 peça
Recipiente de armazenamento de grau alimentarRecipiente de armazenamento de grau alimentar1 peça
Parafuso para madeira n.º 8 x 1"Parafuso para madeira n.º 8 x 1"1 peça

Ferramentas necessárias:

SerroteSerrote
Berbequim sem fiosBerbequim sem fios
Jogo de brocasJogo de brocas
Conjunto de chaves de fendasConjunto de chaves de fendas
6

Wheel, board, lever and dash

Fix the notched wheel on a 12 mm steel rock shaft. Pin the connecting board to one swing bar, its slot over the shaft, so its pins meet the notches. Fix a pine lever to the rock shaft and pin its end to a hollow 18 mm food-grade tube dash stick with a leather flap valve near its top and a perforated dasher at its foot.

Materiais para este passo:

Varão de aço macioVarão de aço macio1 peça
Tábua de pinhoTábua de pinho1 peça
Tubo de PVCTubo de PVC1 peça
Tira de couroTira de couro1 peça
Parafusos de máquinaParafusos de máquina1 peça
Porca sextavadaPorca sextavada1 peça
Epóxi de dois componentesEpóxi de dois componentes1 peça

Ferramentas necessárias:

Serra de arco para metaisSerra de arco para metais
Berbequim sem fiosBerbequim sem fios
Jogo de brocasJogo de brocas
Chave inglesa ajustávelChave inglesa ajustável
7

The patent drawing

US 9,416, drawing sheet, public domain (expired patent).
Passo 7 - Image 1
8

Swing and make butter

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 2 litres. Swing the tank steadily; the dasher strokes twice each full swing. 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.

Materiais para este passo:

Natas para baterNatas para bater2000 ml
Sal marinho grossoSal marinho grosso1 peça
ÁguaÁgua1 peça

Ferramentas necessárias:

Termómetro de sonda permanenteTermómetro de sonda permanente
CronómetroCronómetro
Balança digital de cozinhaBalança digital de cozinha
Taça grande de aço inoxidávelTaça grande de aço inoxidável
9

Pins that miss, a dash that sticks

Double-acting swing dash troubleshooting.

Flow

Loading...
10

History and honest limits

**William F. Davis and Nathan Davis** of Castleton, Rutland County, Vermont, received US 9,416, dated 23 November 1852. Their standards were 2 by 1 inches, 3½ feet long, spread three feet at the bottom, pairs 15 inches apart; the swing board was 13 by 14 inches; the dash stick's hole was ⅝ inch. They claimed the combination of the swing, slotted board, wheel, rock shaft and lever producing two motions of the dash from one oscillation. **Honest limits.** A smaller frame, a container and printed parts stand in for theirs; their swing length is estimated. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.

Materiais

14

Ferramentas necessárias

11

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