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Four-Crank Gyrating Churn: Four Cranks Carry the Tub Round a Small Circle With No Dasher
Alfred Guthrie · Public domain
Martin

Creado por

Martin

10. noviembre 2026NO
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Four-Crank Gyrating Churn: Four Cranks Carry the Tub Round a Small Circle With No Dasher

Alfred Guthrie of Chicago received US 24,907, dated 26 July 1859, for a churn with no dasher at all. Four upright shafts in a frame have cranks on their tops, and a bed plate lies over the four crank pins, so each crank turns on its own centre but all move together. The tub stands on the plate, held by stirrups, and is carried round a small circle, throwing the cream against its sides. A handle turns one crank shaft through cogged gearing. This rung builds it at the patent's own sizes: a frame about two feet square and one foot high, shafts of 3/4 inch iron and 3 inch cranks.
Intermedio
About 2 days, plus printing

Instrucciones

1

How hard the cream is swung

Cargando el cuaderno de Jupyter…
2

A churn with a dasher, before it

Wineman's dasher drove the cream through holes. Guthrie did away with the dasher and moved the whole tub.
3

Read US 24,907

"I connect the whole together by the bed plate D over the wrists of each crank E, E, E, E. Each crank will revolve upon its own center but will each correspond to the motion of the other."
4

Print the wheel H

The 64-tooth spur wheel (module 3, 198 mm across) for the handle shaft I, with a 20 mm bore. PETG, 0.2 mm layers, 50 % infill, 5 walls.
Archivo de DisenoSTLCC0 - Free
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5

Print the pinion H

The 24-tooth spur pinion for the driven crank shaft, with a 19 mm bore and a hub. PETG, 0.2 mm layers, 50 % infill, 5 walls.
Archivo de DisenoSTLCC0 - Free
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6

Frame and bearing bars

Build a pine frame 610 mm square and 305 mm high: four 50 mm corner posts, and 50 mm rails round the top and the bottom. Fit two hardwood bars across it, top and bottom, 150 mm in front of and behind the middle, and bore them 19.6 mm square to the frame at 200 mm either side of the middle, for the four shafts. Screw two hardwood brackets to the right side, top and bottom, bored 20.6 mm 132 mm out from the front right shaft, for the handle shaft.

Materiales para este paso:

Tabla de pinoTabla de pino2 piezas
Madera blanda de 70x70 mmMadera blanda de 70x70 mm2 piezas
Tabla de madera duraTabla de madera dura2 piezas
Tornillo para madera n.º 10 x 3"Tornillo para madera n.º 10 x 3"24 piezas
Cola de carpinteroCola de carpintero1 pieza

Herramientas necesarias:

SerruchoSerrucho
Taladro inalámbricoTaladro inalámbrico
Juego de brocas de palaJuego de brocas de pala
Escuadra fijaEscuadra fija
Nivel de burbujaNivel de burbuja
Cinta métricaCinta métrica
7

Shafts, cranks and plate D

Cut four 19 mm steel shafts 323 mm long and stand them in the bars. Make four hardwood crank arms, 76 mm from the shaft to the crank pin, and pin them on the shafts' tops all pointing the same way. Fit a 19 mm steel crank pin 50 mm long in each. Cut plate D 532 mm across from plywood, bore it for the four pins exactly where they stand, and drop it on them. Turn one crank by hand: the plate must run round freely without turning.

Materiales para este paso:

Barra de acero en brutoBarra de acero en bruto2 piezas
Tabla de madera duraTabla de madera dura1 pieza
Tablero contrachapadoTablero contrachapado1 pieza
Arandela planaArandela plana8 piezas
Surtido de tornillos hexagonalesSurtido de tornillos hexagonales4 piezas
Tuerca autoblocante con inserto de nailonTuerca autoblocante con inserto de nailon4 piezas
Cola de carpinteroCola de carpintero1 pieza

Herramientas necesarias:

Sierra para metalesSierra para metales
Limas (lima de mano)Limas (lima de mano)
Tornillo de bancoTornillo de banco
Taladro inalámbricoTaladro inalámbrico
Juego de brocasJuego de brocas
Sierra de calarSierra de calar
Cinta métricaCinta métrica
Llave inglesa ajustableLlave inglesa ajustable
8

Gearing H and handle I

Pin the pinion on the front right shaft 140 mm up. Stand a 20 mm steel shaft 885 mm long in the brackets, pin the wheel on it level with the pinion, and check they mesh fully. Fix a hardwood handle arm 150 mm long on the shaft's top with a dowel grip.

Materiales para este paso:

Filamento PETGFilamento PETG1 pieza
Barra de acero en brutoBarra de acero en bruto1 pieza
Tabla de madera duraTabla de madera dura1 pieza
Espigas de madera duraEspigas de madera dura1 pieza
Cola de carpinteroCola de carpintero1 pieza

Herramientas necesarias:

Impresora 3D de filamento (FDM)Impresora 3D de filamento (FDM)
Sierra para metalesSierra para metales
Taladro inalámbricoTaladro inalámbrico
Juego de brocasJuego de brocas
9

Tub F on its grooved bottom

Glue a plywood ring to the plate's middle, 282 mm inside and 340 mm outside, so the bucket's foot sits in it. Bend two flat-bar stirrups to go up the bucket's sides and over its lid, notch the ring for them and bolt them to the plate.

Materiales para este paso:

Tablero contrachapadoTablero contrachapado1 pieza
Cola de carpinteroCola de carpintero1 pieza
Pletina de acero dulcePletina de acero dulce2 piezas
Surtido de tornillos hexagonalesSurtido de tornillos hexagonales4 piezas
Tuerca autoblocante con inserto de nailonTuerca autoblocante con inserto de nailon4 piezas
Cubo de 20 litrosCubo de 20 litros1 pieza

Herramientas necesarias:

Sierra de calarSierra de calar
Tornillo de bancoTornillo de banco
Sierra para metalesSierra para metales
Taladro inalámbricoTaladro inalámbrico
Juego de brocasJuego de brocas
Llave inglesa ajustableLlave inglesa ajustable
10

The build in 3D

FreeCAD model of this build: the frame with its bearing bars, the four shafts and cranks, plate D on the crank pins, the bucket in its ring under two stirrups, and the spur wheel on the handle shaft driving the pinion. It was checked at eight crank angles.
Archivo de DisenoBLENDCC0 - Free
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11

Churn

Pour about 8 litres of heavy cream at about 15 °C into the bucket, checked with the thermometer, put the lid on and tighten the stirrups. Turn the handle steadily and time it. When the butter comes, lift the bucket off, pour off the buttermilk, wash the butter in cold water until it runs clear, work in a pinch of salt and weigh it.

Materiales para este paso:

Crema de leche espesaCrema de leche espesa8 l
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
12

Troubleshooting

Four-crank churn troubleshooting.

Flow

Loading...
13

History and honest limits

**Alfred Guthrie** of Chicago, Illinois, assignor to Wardell Guthrie, US 24,907, 26 July 1859, "Churn". He claimed the cranks C connected by the plate D. His sizes are kept: a frame about two feet square and one foot high, shafts of 3/4 inch iron about a foot long, and cranks of 3 inches, which we read from "about a six inch throw or three inches" and Fig. 3's "3 in" marks. He gives no gear sizes; ours are printed spur gears placed as his Figs. 2-3 draw them. Every other size is ours.

Materiales

17

Herramientas requeridas

17

Archivos de diseño

3

Este plano hace

Thumbnail
Marcador

Mantequilla

Free

198
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1
Thumbnail
Marcador

Suero de mantequilla

Free

72
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